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Rules for the Classification of Naval Ships
PART C - Machinery, Systems and Fire Protection
Chapters 2 3
NR 483.C2 DT R01 E November 2011
Marine Division 92571 Neuilly sur Seine Cedex France
Tel: + 33 (0)1 55 24 70 00 Fax: + 33 (0)1 55 24 70 25 Marine
website: http://www.veristar.com Email:
[email protected]
2011 Bureau Veritas - All rights reserved
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ARTICLE 1
1.1. - BUREAU VERITAS is a Society the purpose of whose Marine
Division (the "Society") is the classi-fication (" Classification
") of any ship or vessel or structure of any type or part of it or
system therein col-lectively hereinafter referred to as a "Unit"
whether linked to shore, river bed or sea bed or not,
whetheroperated or located at sea or in inland waters or partly on
land, including submarines, hovercrafts, drillingrigs, offshore
installations of any type and of any purpose, their related and
ancillary equipment, subseaor not, such as well head and pipelines,
mooring legs and mooring points or otherwise as decided by
theSociety.
The Society: prepares and publishes Rules for classification,
Guidance Notes and other documents (Rules); issues Certificates,
Attestations and Reports following its interventions
(Certificates); publishes Registers.
1.2. - The Society also participates in the application of
National and International Regulations or Stand-ards, in particular
by delegation from different Governments. Those activities are
hereafter collectively re-ferred to as " Certification ".1.3. - The
Society can also provide services related to Classification and
Certification such as ship andcompany safety management
certification; ship and port security certification, training
activities; all activi-ties and duties incidental thereto such as
documentation on any supporting means, software, instrumen-tation,
measurements, tests and trials on board.
1.4. - The interventions mentioned in 1.1., 1.2. and 1.3. are
referred to as " Services ". The party and/or itsrepresentative
requesting the services is hereinafter referred to as the " Client
". The Services are pre-pared and carried out on the assumption
that the Clients are aware of the International Maritimeand/or
Offshore Industry (the "Industry") practices.1.5. - The Society is
neither and may not be considered as an Underwriter, Broker in
ship's sale or char-tering, Expert in Unit's valuation, Consulting
Engineer, Controller, Naval Architect, Manufacturer, Ship-builder,
Repair yard, Charterer or Shipowner who are not relieved of any of
their expressed or impliedobligations by the interventions of the
Society.
ARTICLE 22.1. - Classification is the appraisement given by the
Society for its Client, at a certain date, following sur-veys by
its Surveyors along the lines specified in Articles 3 and 4
hereafter on the level of compliance ofa Unit to its Rules or part
of them. This appraisement is represented by a class entered on the
Certificatesand periodically transcribed in the Society's
Register.
2.2. - Certification is carried out by the Society along the
same lines as set out in Articles 3 and 4 hereafterand with
reference to the applicable National and International Regulations
or Standards.
2.3. - It is incumbent upon the Client to maintain the condition
of the Unit after surveys, to presentthe Unit for surveys and to
inform the Society without delay of circumstances which may affect
thegiven appraisement or cause to modify its scope.2.4. - The
Client is to give to the Society all access and information
necessary for the safe and efficientperformance of the requested
Services. The Client is the sole responsible for the conditions of
presenta-tion of the Unit for tests, trials and surveys and the
conditions under which tests and trials are carried out.
ARTICLE 33.1. - The Rules, procedures and instructions of the
Society take into account at the date of theirpreparation the state
of currently available and proven technical knowledge of the
Industry. Theyare not a standard or a code of construction neither
a guide for maintenance, a safety handbookor a guide of
professional practices, all of which are assumed to be known in
detail and carefullyfollowed at all times by the Client.Committees
consisting of personalities from the Industry contribute to the
development of those docu-ments.3.2. - The Society only is
qualified to apply its Rules and to interpret them. Any reference
to themhas no effect unless it involves the Society's
intervention.3.3. - The Services of the Society are carried out by
professional Surveyors according to the applicableRules and to the
Code of Ethics of the Society. Surveyors have authority to decide
locally on matters re-lated to classification and certification of
the Units, unless the Rules provide otherwise.
3.4. - The operations of the Society in providing its Services
are exclusively conducted by way ofrandom inspections and do not in
any circumstances involve monitoring or exhaustive
verifica-tion.
ARTICLE 4
4.1. - The Society, acting by reference to its Rules: reviews
the construction arrangements of the Units as shown on the
documents presented by the Cli-
ent; conducts surveys at the place of their construction;
classes Units and enters their class in its Register; surveys
periodically the Units in service to note that the requirements for
the maintenance of class are
met.
The Client is to inform the Society without delay of
circumstances which may cause the date or theextent of the surveys
to be changed.
ARTICLE 55.1. - The Society acts as a provider of services. This
cannot be construed as an obligation bearingon the Society to
obtain a result or as a warranty.5.2. - The certificates issued by
the Society pursuant to 5.1. here above are a statement on the
levelof compliance of the Unit to its Rules or to the documents of
reference for the Services providedfor.In particular, the Society
does not engage in any work relating to the design, building,
productionor repair checks, neither in the operation of the Units
or in their trade, neither in any advisory serv-ices, and cannot be
held liable on those accounts. Its certificates cannot be construed
as an im-plied or express warranty of safety, fitness for the
purpose, seaworthiness of the Unit or of its valuefor sale,
insurance or chartering.5.3. - The Society does not declare the
acceptance or commissioning of a Unit, nor of its construc-tion in
conformity with its design, that being the exclusive responsibility
of its owner or builder,respectively.
5.4. - The Services of the Society cannot create any obligation
bearing on the Society or constitute anywarranty of proper
operation, beyond any representation set forth in the Rules, of any
Unit, equipment ormachinery, computer software of any sort or other
comparable concepts that has been subject to any sur-vey by the
Society.
ARTICLE 66.1. - The Society accepts no responsibility for the
use of information related to its Services which was notprovided
for the purpose by the Society or with its assistance.
6.2. - If the Services of the Society cause to the Client a
damage which is proved to be the directand reasonably foreseeable
consequence of an error or omission of the Society, its liability
to-wards the Client is limited to ten times the amount of fee paid
for the Service having caused thedamage, provided however that this
limit shall be subject to a minimum of eight thousand (8,000)Euro,
and to a maximum which is the greater of eight hundred thousand
(800,000) Euro and oneand a half times the above mentioned fee.The
Society bears no liability for indirect or consequential loss such
as e.g. loss of revenue, lossof profit, loss of production, loss
relative to other contracts and indemnities for termination of
oth-er agreements.6.3. - All claims are to be presented to the
Society in writing within three months of the date when the
Serv-ices were supplied or (if later) the date when the events
which are relied on of were first known to the Client,and any claim
which is not so presented shall be deemed waived and absolutely
barred. Time is to be in-terrupted thereafter with the same
periodicity.
ARTICLE 77.1. - Requests for Services are to be in writing.7.2.
- Either the Client or the Society can terminate as of right the
requested Services after givingthe other party thirty days' written
notice, for convenience, and without prejudice to the provisionsin
Article 8 hereunder. 7.3. - The class granted to the concerned
Units and the previously issued certificates remain valid until
thedate of effect of the notice issued according to 7.2. here above
subject to compliance with 2.3. here aboveand Article 8
hereunder.
7.4. - The contract for classification and/or certification of a
Unit cannot be transferred neither assigned.
ARTICLE 88.1. - The Services of the Society, whether completed
or not, involve, for the part carried out, the paymentof fee upon
receipt of the invoice and the reimbursement of the expenses
incurred.
8.2. Overdue amounts are increased as of right by interest in
accordance with the applicable leg-islation.8.3. - The class of a
Unit may be suspended in the event of non-payment of fee after a
first unfruitfulnotification to pay.
ARTICLE 9
9.1. - The documents and data provided to or prepared by the
Society for its Services, and the informationavailable to the
Society, are treated as confidential. However: clients have access
to the data they have provided to the Society and, during the
period of classifica-
tion of the Unit for them, to the classification file consisting
of survey reports and certificates whichhave been prepared at any
time by the Society for the classification of the Unit;
copy of the documents made available for the classification of
the Unit and of available survey reportscan be handed over to
another Classification Society, where appropriate, in case of the
Unit's transferof class;
the data relative to the evolution of the Register, to the class
suspension and to the survey status of theUnits, as well as general
technical information related to hull and equipment damages, are
passed onto IACS (International Association of Classification
Societies) according to the association workingrules;
the certificates, documents and information relative to the
Units classed with the Society may bereviewed during certificating
bodies audits and are disclosed upon order of the concerned
governmen-tal or inter-governmental authorities or of a Court
having jurisdiction.
The documents and data are subject to a file management
plan.
ARTICLE 1010.1. - Any delay or shortcoming in the performance of
its Services by the Society arising from an eventnot reasonably
foreseeable by or beyond the control of the Society shall be deemed
not to be a breach ofcontract.
ARTICLE 1111.1. - In case of diverging opinions during surveys
between the Client and the Society's surveyor, the So-ciety may
designate another of its surveyors at the request of the
Client.
11.2. - Disagreements of a technical nature between the Client
and the Society can be submitted by theSociety to the advice of its
Marine Advisory Committee.
ARTICLE 1212.1. - Disputes over the Services carried out by
delegation of Governments are assessed within theframework of the
applicable agreements with the States, international Conventions
and national rules.
12.2. - Disputes arising out of the payment of the Society's
invoices by the Client are submitted to the Courtof Nanterre,
France.
12.3. - Other disputes over the present General Conditions or
over the Services of the Society areexclusively submitted to
arbitration, by three arbitrators, in London according to the
ArbitrationAct 1996 or any statutory modification or re-enactment
thereof. The contract between the Societyand the Client shall be
governed by English law.
ARTICLE 1313.1. - These General Conditions constitute the sole
contractual obligations binding together theSociety and the Client,
to the exclusion of all other representation, statements, terms,
conditionswhether express or implied. They may be varied in writing
by mutual agreement.13.2. - The invalidity of one or more
stipulations of the present General Conditions does not affect the
va-lidity of the remaining provisions.
13.3. - The definitions herein take precedence over any
definitions serving the same purpose which mayappear in other
documents issued by the Society.
BV Mod. Ad. ME 545 k - 17 December 2008
MARINE DIVISION
GENERAL CONDITIONS
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RULES FOR THE CLASSIFICATION OFNAVAL SHIPS
Part CMachinery, Systems and Fire Protection
Chapters 1 2 3 4
Chapter 1 MACHINERY
Chapter 2 ELECTRICAL INSTALLATIONSChapter 3 AUTOMATIONChapter 4
FIRE PROTECTION, DETECTION AND EXTINCTIONNovember 2011
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CHAPTER 2ELECTRICAL INSTALLATIONS
Section 1 General1 Application 19
1.1 General1.2 References to other regulations and standards
2 Documentation to be submitted 202.1
3 Definitions 203.1 General3.2 Essential services3.3 Primary
essential services3.4 Secondary essential services3.5 Safety
voltage3.6 Low-voltage systems3.7 High-voltage systems3.8 Basic
insulation3.9 Supplementary insulation3.10 Double insulation3.11
Reinforced insulation3.12 Earthing3.13 Normal operational and
habitable condition3.14 Emergency condition3.15 Main source of
electrical power3.16 Dead ship condition3.17 Main generating
station3.18 Main switchboard3.19 Emergency switchboard3.20
Emergency source of electrical power3.21 Section boards3.22
Distribution board3.23 Final sub-circuit3.24 Hazardous areas3.25
Certified safe-type equipment3.26 Environmental categories
Section 2 General Design Requirements1 Environmental conditions
24
1.1 General1.2 Ambient air temperatures1.3 Humidity1.4 Cooling
water temperatures1.5 Salt mist1.6 Inclinations1.7 Vibrations1.8
ShockNovember 2011 Bureau Veritas Rules for Naval Ships 3
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2 Quality of power supply 252.1 General2.2 A.c. distribution
systems2.3 D.c. distribution systems2.4 Harmonic distortions
3 Electromagnetic susceptibility 263.1
4 Materials 264.1 General4.2 Insulating materials for
windings4.3 Insulating materials for cables
5 Construction 265.1 General5.2 Degree of protection of
enclosures
6 Protection against explosion hazard 276.1 Protection against
explosive gas or vapour atmosphere hazard6.2 Protection against
combustible dust hazard
Section 3 System Design1 Supply systems and characteristics of
the supply 28
1.1 Supply systems1.2 Maximum voltages
2 Sources of electrical power 292.1 General2.2 Main source of
electrical power2.3 Emergency source of electrical power2.4 Use of
emergency generator in port
3 Distribution 313.1 Earthed distribution systems3.2 Insulated
distribution systems3.3 General requirements for distribution
systems3.4 Main distribution of electrical power3.5 Emergency
distribution of electrical power3.6 Shore/Ship supply3.7 Supply of
motors3.8 Specific requirements for special power services3.9 Power
supply to heaters3.10 Power supply to lighting installations3.11
Special lighting services3.12 Navigation and signalling lights3.13
General emergency alarm system3.14 Public address system3.15
Combined general emergency alarm - public address system3.16
Control and indication circuits3.17 Power supply to the speed
control systems of main propulsion engines3.18 Power supply to the
speed control systems of generator sets4 Bureau Veritas Rules for
Naval Ships November 2011
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4 Degrees of protection of the enclosures 364.1 General4.2
Installation of electrical and electronic equipment in engine rooms
protected by
fixed water-based local application fire-fighting systems
(FWBLAFFS)
5 Diversity (demand) factors 385.1 General
6 Environmental categories of the equipment 386.1 Environmental
categories
7 Electrical protection 397.1 General requirements for
overcurrent protection7.2 Short-circuit currents7.3 Selection of
equipment7.4 Protection against short-circuit7.5 Continuity of
supply and continuity of service7.6 Protection against overload7.7
Localization of over-current protection7.8 Protection of
generators7.9 Protection of circuits7.10 Protection of motors7.11
Protection of storage batteries7.12 Protection of shore power
connection7.13 Protection of measuring instruments, pilot lamps and
control circuits7.14 Protection of transformers
8 System components 438.1 General
9 Electrical cables 439.1 General9.2 Choice of insulation9.3
Choice of protective covering9.4 Cables in refrigerated spaces9.5
Cables in areas with a risk of explosion9.6 Cables in circuits
required to be operable under fire conditions9.7 Cables for
submerged bilge pumps9.8 Internal wiring of switchboards and other
enclosures for equipment9.9 Current carrying capacity of cables9.10
Minimum nominal cross-sectional area of conductors9.11 Choice of
cables
10 Electrical installations in hazardous areas 4810.1 Electrical
equipment10.2 Electrical cables10.3 Electrical installations in
battery rooms10.4 Electrical installations in paint stores10.5
Electrical installations in stores for welding gas (acetylene)
bottlesNovember 2011 Bureau Veritas Rules for Naval Ships 5
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Section 4 Rotating Machines1 Constructional and operational
requirements for generators and motors 50
1.1 Mechanical construction1.2 Sliprings, commutators and
brushes1.3 Terminal connectors1.4 Electrical insulation
2 Special requirements for generators 502.1 Prime movers, speed
governors and overspeed protection2.2 A.c. generators
3 Testing of rotating machines 513.1 General3.2 Shaft
material3.3 Tests
4 Description of the test 524.1 Examination of the technical
documentation, as appropriate, and visual
inspection4.2 Insulation resistance measurement4.3 Winding
resistance measurement4.4 Verification of the voltage regulation
system4.5 Rated load test and temperature rise measurements4.6
Overload/overcurrent tests4.7 Verification of steady short-circuit
conditions4.8 Overspeed test4.9 Dielectric strength test4.10 No
load test4.11 Verification of degree of protection4.12 Verification
of bearings
Section 5 Transformers1 Constructional and operational
requirements 54
1.1 Construction1.2 Terminals1.3 Voltage variation,
short-circuit conditions and parallel operation1.4 Electrical
insulation and temperature rise1.5 Insulation tests
2 Testing 552.1 General2.2 Tests on transformers
Section 6 Semiconductor Convertors1 Constructional and
operational requirements 56
1.1 Construction1.2 Protection1.3 Parallel operation with other
power sources1.4 Temperature rise1.5 Insulation test6 Bureau
Veritas Rules for Naval Ships November 2011
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2 Testing 572.1 General2.2 Tests on convertors
Section 7 Storage Batteries and Chargers1 Constructional
requirements for batteries 58
1.1 General1.2 Vented batteries1.3 Valve-regulated sealed
batteries1.4 Tests on batteries
2 Constructional requirements for chargers 582.1
Characteristics2.2 Tests on chargers
Section 8 Switchgear and Controlgear Assemblies1 Constructional
requirements for main and emergency switchboards 60
1.1 Construction1.2 Busbars and bare conductors1.3 Internal
wiring1.4 Switchgear and controlgear1.5 Auxiliary circuits1.6
Instruments
2 Constructional requirements for section boards and
distribution boards 622.1 Construction
3 Testing 623.1 General3.2 Inspection of equipment, check of
wiring and electrical operation test3.3 High voltage test3.4
Measurement of insulation resistance
Section 9 Cables1 Constructional requirements 64
1.1 Construction1.2 Conductors1.3 Insulating materials1.4 Inner
covering, fillers and binders1.5 Protective coverings (armour and
sheath)1.6 Identification
2 Testing 652.1 Type tests2.2 Routine testsNovember 2011 Bureau
Veritas Rules for Naval Ships 7
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Section 10 Miscellaneous Equipment1 Switchgear and controlgear,
protective devices 66
1.1 General1.2 Circuit-breakers1.3 Protection devices
2 Lighting fittings 662.1 Applicable requirements2.2
Construction
3 Accessories 663.1 Applicable requirements3.2 Construction
4 Plug-and-socket connections 674.1 Applicable requirements
5 Heating and cooking appliances 675.1 Applicable
requirements5.2 General5.3 Space heaters5.4 Cooking appliances5.5
Fuel oil and lube oil heaters5.6 Water heaters
Section 11 Location1 General 68
1.1 Location1.2 Areas with a risk of explosion
2 Main electrical system 682.1 Location in relation to the
emergency system2.2 Main switchboard
3 Emergency electrical system 683.1 Spaces for the emergency
source3.2 Location in relation to the main electrical system3.3
Emergency switchboard3.4 Emergency battery
4 Distribution boards 694.1 Distribution boards for cargo spaces
and similar spaces4.2 Distribution board for navigation lights
5 Cable runs 695.1 General5.2 Location of cables in relation to
the risk of fire and overheating5.3 Location of cables in relation
to electromagnetic interference5.4 Services with a duplicate
feeder5.5 Emergency circuits8 Bureau Veritas Rules for Naval Ships
November 2011
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6 Storage batteries 696.1 General6.2 Large vented batteries6.3
Moderate vented batteries6.4 Small vented batteries6.5
Ventilation
Section 12 Installation1 General 72
1.1 Protection against injury or damage caused by electrical
equipment1.2 Protection against damage to electrical equipment1.3
Accessibility
2 Earthing of non-current carrying parts 722.1 Parts which are
to be earthed2.2 Methods of earthing2.3 Earthing connections2.4
Connection to the ships structure2.5 Earthed distribution
systems2.6 Aluminium superstructures
3 Rotating machines 733.1 General
4 Semiconductor convertors 734.1 Semiconductor power
convertors
5 Vented type storage batteries 735.1 General5.2 Protection
against corrosion
6 Switchgear and controlgear assemblies 746.1 Main
switchboard6.2 Emergency switchboard6.3 Section boards and
distribution boards
7 Cables 747.1 General7.2 Radius of bend7.3 Fixing of cables7.4
Mechanical protection7.5 Penetrations of bulkheads and decks7.6
Expansion joints7.7 Cables in closed pipes or conduits7.8 Cables in
casings or trunking and conduits with removable covers7.9 Cable
ends7.10 Joints and tappings (branch circuit)7.11 Earthing and
continuity of metal coverings of cables7.12 Earthing and continuity
of metal pipes, conduits and trunking or casings7.13 Precautions
for single-core cables for a.c.7.14 Cables in refrigerated
spaces7.15 Cables in areas with a risk of explosion7.16 Cables in
the vicinity of radio equipment7.17 Cables for submerged bilge
pumpsNovember 2011 Bureau Veritas Rules for Naval Ships 9
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8 Various appliances 808.1 Lighting fittings8.2 Heating
appliances8.3 Heating cables and tapes or other heating
elements
Section 13 High Voltage Installations1 General 81
1.1 Field of application1.2 Nominal system voltage1.3
High-voltage, low-voltage segregation
2 System design 812.1 Distribution2.2 Degrees of protection2.3
Insulation2.4 Protection
3 Rotating machinery 823.1 Stator windings of generators3.2
Temperature detectors3.3 Tests
4 Power transformers 834.1 General
5 Cables 835.1 General
6 Switchgear and controlgear assemblies 836.1 General6.2
Construction6.3 Auxiliary systems6.4 High voltage test
7 Installation 837.1 Electrical equipment7.2 Cables
Section 14 Electric Propulsion Plant1 General 85
1.1 Applicable requirements1.2 Operating conditions
2 Design of the propulsion plant 852.1 General2.2 Power
supply2.3 Auxiliary machinery2.4 Electrical Protection2.5
Excitation of electric propulsion motor10 Bureau Veritas Rules for
Naval Ships November 2011
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3 Construction of rotating machines and semiconductor convertors
863.1 Ventilation3.2 Protection against moisture and condensate3.3
Rotating machines3.4 Semiconductor convertors
4 Control and monitoring 874.1 General4.2 Power plant control
systems4.3 Indicating instruments 4.4 Alarm system4.5 Reduction of
power
5 Installation 885.1 Ventilation of spaces5.2 Cable runs
6 Tests 886.1 Test of rotating machines
7 Specific requirements for PODs 897.1 General7.2 Rotating
commutators7.3 Electric motors 7.4 Instrumentation and associated
devices7.5 Additional tests
Section 15 Testing1 General 90
1.1 Rule application1.2 Insulation-testing instruments
2 Type approved components 902.1
3 Insulation resistance 903.1 Lighting and power circuits3.2
Internal communication circuits3.3 Switchboards3.4 Generators and
motors
4 Earth 904.1 Electrical constructions4.2 Metal-sheathed cables,
metal pipes or conduits
5 Operational tests 915.1 Generating sets and their protective
devices5.2 Switchgear5.3 Consuming devices5.4 Communication
systems5.5 Installations in areas with a risk of explosion5.6
Voltage dropNovember 2011 Bureau Veritas Rules for Naval Ships
11
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CHAPTER 3AUTOMATION
Section 1 General Requirements1 General 95
1.1 Field of application1.2 Regulations and standards1.3
Definitions1.4 General
2 Documentation 962.1 General2.2 Documents to be submitted2.3
Documents for computer based system2.4 Documents for type approval
of equipment
3 Environmental and supply conditions 973.1 General3.2 Power
supply conditions
4 Materials and construction 984.1 General4.2 Type approved
components
Section 2 Design Requirements1 General 99
1.1
2 Power supply of automation systems 992.1 General2.2 Electrical
power supply
3 Control systems 993.1 General3.2 Local control3.3 Remote
control systems3.4 Automatic control systems
4 Control of propulsion machinery 1004.1 Local control4.2 Remote
control4.3 Remote control from navigating bridge4.4 Automatic
control 4.5 Automatic control of propulsion and manoeuvring
units4.6 Clutches4.7 Brakes
5 Remote control of valves 1015.1 12 Bureau Veritas Rules for
Naval Ships November 2011
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6 Alarm system 1016.1 General requirements6.2 Alarm
functions
7 Safety system 1027.1 Design7.2 Function7.3 Shutdown7.4 Standby
systems7.5 Testing
Section 3 Computer Based Systems1 General requirements 103
1.1 General1.2 System type approval1.3 System operation1.4
System reliability1.5 System failure 1.6 System redundancy
2 Hardware 1032.1 General2.2 Housing
3 Software 1033.1 General3.2 Software development quality
4 Data transmission link 1044.1 General4.2 Hardware support4.3
Transmission software 4.4 Transmission operation4.5 Redundant
network
5 Man-machine interface 1045.1 General5.2 System functional
indication5.3 Input devices5.4 Output devices5.5 Workstations5.6
Computer dialogue
6 Integrated systems 1056.1 General
7 System testing 1067.1
8 System maintenance 1068.1 November 2011 Bureau Veritas Rules
for Naval Ships 13
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Section 4 Constructional Requirements1 General 107
1.1 General1.2 Materials1.3 Component design1.4 Environmental
and supply conditions
2 Electrical and/or electronic systems 1072.1 General2.2
Electronic system2.3 Electrical system
3 Pneumatic systems 1083.1
4 Hydraulic systems 1084.1
5 Automation consoles 1085.1 General5.2 Indicating
instruments5.3 VDUs and keyboards
Section 5 Installation Requirements1 General 109
1.1
2 Sensors and components 1092.1 General2.2 Temperature
elements2.3 Pressure elements
3 Cables 1093.1 Installation3.2 Cable terminations
4 Pipes 1104.1
5 Automation consoles 1105.1 General14 Bureau Veritas Rules for
Naval Ships November 2011
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Section 6 Testing1 General 111
1.1 General
2 Type approval 1112.1 General2.2 Hardware type approval2.3
Software type approval2.4 Loading instruments
3 Acceptance testing 1153.1 General3.2 Hardware testing3.3
Software testing
4 Commissioning 1164.1 GeneralNovember 2011 Bureau Veritas Rules
for Naval Ships 15
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16 Bureau Veritas Rules for Naval Ships November 2011
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Part CMachinery, Systems and Fire Protection
Chapter 2
ELECTRICAL INSTALLATIONS
SECTION 1 GENERAL
SECTION 2 GENERAL DESIGN REQUIREMENTS
SECTION 3 SYSTEM DESIGN
SECTION 4 ROTATING MACHINES
SECTION 5 TRANSFORMERS
SECTION 6 SEMICONDUCTOR CONVERTORS
SECTION 7 STORAGE BATTERIES AND CHARGERS
SECTION 8 SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
SECTION 9 CABLES
SECTION 10 MISCELLANEOUS EQUIPMENT
SECTION 11 LOCATION
SECTION 12 INSTALLATION
SECTION 13 HIGH VOLTAGE INSTALLATIONS
SECTION 14 ELECTRIC PROPULSION PLANT
SECTION 15 TESTINGNovember 2011 Bureau Veritas Rules for Naval
Ships 17
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18 Bureau Veritas Rules for Naval Ships November 2011
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Pt C, Ch 2, Sec 1SECTION 1 GENERAL
1 Application
1.1 General
1.1.1 The requirements of this Chapter apply to
electricalinstallations on ships. In particular, they apply to the
com-ponents of electrical installations for essential services.
The other parts of the installation are to be so designed asnot
to introduce any malfunction to the ship and hazard
topersonnel.
1.2 References to other regulations andstandards
1.2.1 The Society may refer to other regulations and stan-dards
when deemed necessary. These include the IEC publi-cations, notably
the IEC 60092 series.
1.2.2 When referred to by the Society, publications by
theInternational Electrotechnical Commission (IEC) or
otherinternationally recognized standards, are those currently
inforce at the date of agreement for ship classification.
Table 1 : Documents to be submitted
No I/A (1) Document1 A Single line diagram of main power and
lighting systems
2 A Electrical power balance
3 A Calculation of short-circuit currents for each installation
in which the sum of rated power of the energy sourceswhich may be
connected contemporaneously to the network is greater than 500 kVA
(kW)
4 A List of circuits including, for each supply and distribution
circuit, data concerning the nominal current, the cabletype, length
and cross-section, nominal and setting values of the protective and
control devices
5 A Single line diagram and detailed diagram of the main
switchboard
6 A Single line diagram and detailed diagram of the emergency
switchboards
7 A Diagram of the most important section boards and motor
control centres (above 100 kW)
8 A Diagram of the supply, monitoring and control systems of
propulsion motors and generator prime movers
9 A Diagram of the supply, monitoring and control systems of the
rudder propellers
10 A Diagram of the supply, monitoring and control systems of
controllable pitch propellers
11 A Diagram of the general emergency alarm system and of the
intercommunication systems requested in Ch 4, Sec8, [1.1.2]
12 A Detailed diagram of the navigation-light switchboard
13 A Diagram of the remote stop system (ventilation, fuel pump,
fuel valves, etc.)
14 A (2) Selectivity and coordination of the electrical
protection15 A Single line diagram of electrical propulsion
system
16 A Principles of control system and power supply of electrical
propulsion system
17 A Alarm and monitoring system including, for electrical
propulsion system: list of alarms and monitoring points power
supply diagram.
18 A Safety system including, for electrical propulsion system:
list of monitored parameters for safety system power supply
diagram.
19 I (3) Arrangements and details of the propulsion control
consoles and panels20 I (3) Arrangements and details of electrical
coupling21 I (3) Arrangements and details of the frequency
converters together with the justification of their
characteristics22 I (3) Arrangements of the cooling system provided
for the frequency converters and motor enclosure23 I (3)
Measurements of voltage signal form for converters directly
connected to high voltage (HV) network24 I (3) Computation of
permanent and transitory voltage drops of LV and HV networks25 A
(3) Test program for converters and rotating machines having rated
power > 1 MW, dock and sea trials
(1) A: to be submitted for approvalI : to be submitted for
information.
(2) for high voltage installations.(3) for electric propulsion
installations.November 2011 Bureau Veritas Rules for Naval Ships
19
-
Pt C, Ch 2, Sec 12 Documentation to be submitted
2.1
2.1.1 The documents listed in Tab 1 are to be submitted.
The list of documents requested is to be intended as guid-ance
for the complete set of information to be submitted,rather than an
actual list of titles.
The Society reserves the right to request the submission
ofadditional documents in the case of non-conventionaldesign or if
it is deemed necessary for the evaluation of thesystem, equipment
or components.
Unless otherwise agreed with the Society, documents forapproval
are to be sent in triplicate if submitted by the Ship-yard and in
four copies if submitted by the equipment sup-plier.
Documents requested for information are to be sent
induplicate.
In any case, the Society reserves the right to require
addi-tional copies when deemed necessary.
3 Definitions
3.1 General
3.1.1 Unless otherwise stated, the terms used in this Chap-ter
have the definitions laid down by the IEC standards.
The definitions given in the following requirements
alsoapply.
3.2 Essential services
3.2.1 Essential services are defined in Pt A, Ch 1, Sec
1,[1.2.1]. They are subdivided in primary and secondaryessential
services.
3.3 Primary essential services
3.3.1 Primary essential services are those which need to
bemaintained in continuous operation.
Primary essential services are services such as:
steering gear
actuating systems of controllable pitch propellers
scavenging air blowers, fuel oil supply pumps, fuelvalve cooling
pumps, lubricating oil pumps and coolingwater pumps for main and
auxiliary engines and tur-bines necessary for the propulsion
forced draught fans, feed water pumps, water circulatingpumps,
condensate pumps, oil burning installations, forsteam plants or
steam turbines ship, and also for auxil-iary boilers on ship where
steam is used for equipmentsupplying primary essential services
azimuth thrusters which are the sole means for
propul-sion/steering with lubricating oil pumps, cooling
waterpumps
electrical equipment for electric propulsion plant
withlubricating oil pumps and cooling water pumps
electric generators and associated power sources sup-plying the
above equipment
hydraulic pumps supplying the above equipment
viscosity control equipment for heavy fuel oil
control, monitoring and safety devices/systems forequipment for
primary essential services
speed regulators dependent on electrical energy formain or
auxiliary engines necessary for propulsion
starting equipment of diesel engines and gas turbines
at least one fire pump, when required to be permanentlyin
operation.
The main lighting system for those parts of the ship nor-mally
accessible to and used by personnel and passengersis also
considered (included as) a primary essential service.
3.4 Secondary essential services
3.4.1 Secondary essential services are those services whichneed
not necessarily be in continuous operation.
Secondary essential services are services such as:
windlasses
fuel oil transfer pumps and fuel oil treatment equipment
lubrication oil transfer pumps and lubrication oil treat-ment
equipment
preheaters for heavy fuel oil
sea water pumps
starting air and control air compressors
bilge, ballast and heeling pumps
fire pumps and other fire-extinguishing medium pumps
ventilation fans for engine and boiler rooms
services considered necessary to maintain dangerouscargo in a
safe condition
navigation lights, aids and signals
internal safety communication equipment
fire detection and alarm systems
electrical equipment for watertight closing appliances
electric generators and associated power supplying theabove
equipment
hydraulic pumps supplying the above equipment
control, monitoring and safety for cargo containmentsystems
control, monitoring and safety devices/systems forequipment for
secondary essential services.20 Bureau Veritas Rules for Naval
Ships November 2011
-
Pt C, Ch 2, Sec 13.4.2 Services for habitability are those
intended for mini-mum comfort conditions for people on board, and
speciallyin engine control room, safety room and operation
controlroom.
Examples of equipment for maintaining conditions of
habit-ability:
cooking
heating
domestic refrigeration
mechanical ventilation
sanitary and fresh water
electric generators and associated power sources sup-plying the
above equipment.
3.5 Safety voltage
3.5.1 A voltage which does not exceed 50 V a.c. r.m.s.between
conductors, or between any conductor and earth,in a circuit
isolated from the supply by means such as asafety isolating
transformer.
3.5.2 A voltage which does not exceed 50 V d.c.
betweenconductors or between any conductor and earth in a
circuitisolated from higher voltage circuits.
3.6 Low-voltage systems
3.6.1 Alternating current systems with rated voltagesgreater
than 50 V r.m.s. up to 1000 V r.m.s. inclusive anddirect current
systems with a maximum instantaneous valueof the voltage under
rated operating conditions greater than50 V up to 1500 V
inclusive.
3.7 High-voltage systems
3.7.1 Alternating current systems with rated voltagesgreater
than 1000 V r.m.s. and direct current systems with amaximum
instantaneous value of the voltage under ratedoperating conditions
greater than 1500 V.
3.8 Basic insulation
3.8.1 Insulation applied to live parts to provide basic
pro-tection against electric shock.
Note 1: Basic insulation does not necessarily include
insulationused exclusively for functional purposes.
3.9 Supplementary insulation
3.9.1 Independent insulation applied in addition to
basicinsulation in order to provide protection against
electricshock in the event of a failure of basic insulation.
3.10 Double insulation
3.10.1 Insulation comprising both basic insulation and
sup-plementary insulation.
3.11 Reinforced insulation
3.11.1 A single insulation system applied to live parts,which
provides a degree of protection against electric shockequivalent to
double insulation.Note 1: The term "single insulation system" does
not imply that theinsulation must be one homogeneous piece. It may
comprise sev-eral layers which cannot be tested singly as
supplementary or basicinsulation.
3.12 Earthing3.12.1 The earth connection to the general mass of
the hullof the ship in such a manner as will ensure at all times
animmediate discharge of electrical energy without danger.
3.13 Normal operational and habitablecondition
3.13.1 A condition under which the ship as a whole,
themachinery, services, means and aids ensuring propulsion,ability
to steer, safe navigation, pay load, fire and floodingsafety,
internal and external communications and signals,means of escape,
and emergency boat winches, as well asthe designed comfortable
conditions of habitability are inworking order and functioning
normally.
3.14 Emergency condition3.14.1 A condition under which any
services needed fornormal operational and habitable conditions are
not inworking order due to failure of the main source of
electricalpower.
3.15 Main source of electrical power
3.15.1 A source intended to supply electrical power to amain
switchboard for distribution to all services necessaryfor
maintaining the ship in normal operational and habit-able
condition.
3.16 Dead ship condition
3.16.1 The condition under which the main propulsionplant,
boilers and auxiliaries are not in operation due to theabsence of
power.Note 1: Dead ship condition is a condition in which the
entiremachinery installation, including the power supply, is out of
opera-tion and the auxiliary services such as compressed air,
starting cur-rent from batteries etc., for bringing the main
propulsion intooperation and for the restoration of the main power
supply are notavailable.
3.17 Main generating station3.17.1 The space in which a main
source of electricalpower is situated.
3.18 Main switchboard
3.18.1 A switchboard which is directly supplied by a mainsource
of electrical power and is intended to distribute elec-trical
energy to the ships services.November 2011 Bureau Veritas Rules for
Naval Ships 21
-
Pt C, Ch 2, Sec 13.19 Emergency switchboard
3.19.1 A switchboard which in the event of failure of themain
electrical power supply system is directly supplied bythe emergency
source of electrical power or the transitionalsource of emergency
electrical power and is intended todistribute electrical energy to
the emergency services.
3.20 Emergency source of electrical power
3.20.1 A source of electrical power, intended to supply
theemergency switchboard in the event of failure of the supplyfrom
the main electrical power supply system.
3.21 Section boards
3.21.1 A switchgear and controlgear assembly which issupplied by
another assembly and arranged for the distribu-tion of electrical
energy to other section boards or distribu-tion boards.
3.22 Distribution board
3.22.1 A switchgear and controlgear assembly arranged forthe
distribution of electrical energy to final sub-circuits.
3.23 Final sub-circuit
3.23.1 That portion of a wiring system extending beyondthe final
required overcurrent protective device of a board.
3.24 Hazardous areas
3.24.1 Areas in which an explosive atmosphere is present,or may
be expected to be present due to the presence ofvapours, gases,
flammable dusts or explosives in quantitiessuch as to require
special precautions for the construction,installation and use of
electrical apparatus.
3.24.2 Hazardous areas are classified in zones based uponthe
frequency and the duration of the occurrence of explo-sive
atmosphere.
3.24.3 Hazardous areas for explosive gas atmosphere
areclassified in the following zones:
zone 0: an area in which an explosive gas atmosphere ispresent
continuously or is present for long periods
zone 1: an area in which an explosive gas atmosphere islikely to
occur in normal operation
zone 2: an area in which an explosive gas atmosphere isnot
likely to occur in normal operation and if it doesoccur, is likely
to do only infrequently and will exist fora short period only.
3.25 Certified safe-type equipment
3.25.1 Certified safe-type equipment is electrical equip-ment of
a type for which a national or other appropriateauthority has
carried out the type verifications and testsnecessary to certify
the safety of the equipment with regardto explosion hazard when
used in an explosive gas atmo-sphere.
3.26 Environmental categories
3.26.1 Electrical equipment is classified into
environmentalcategories according to the temperature range,
vibrationlevels, and resistance to chemically active substances
andto humidity.
The designation of the environmental categories is indi-cated by
the EC Code in Tab 2.
The first characteristic numeral indicates the temperaturerange
in which the electrical equipment operates satisfacto-rily, as
specified in Tab 3.
The second characteristic numeral indicates the vibrationlevel
in which the electrical equipment operates satisfacto-rily, as
specified in Tab 4.
3.26.2 The tests for verifying the additional and supple-mentary
letters and the characteristic numeral of the envi-ronmental
categories are defined in Ch 3, Sec 6.
Table 2 : EC Code
Table 3 : First characteristic numeral
Code letter First characteristic numeral Second characteristic
numeral Additional letter Supplementary letter
EC (numerals 1 to 4) (numerals 1 to 3) (letter S) (1) (letter C)
(2)(1) The additional letter S indicates the resistance to salt
mist (exposed decks, masts) of the electrical equipment.(2) The
supplementary letter C indicates the relative humidity up to 80%
(air conditioned areas) in which the electrical equipment
operates satisfactorily.
First characteristic numeral Brief description of location
Temperature range C
1 Air conditioned areas + 5 + 40
2 Enclosed spaces + 5 + 45
3 Inside consoles or close to combustion engines and similar + 5
+ 55
4 Exposed decks, masts 25 + 4522 Bureau Veritas Rules for Naval
Ships November 2011
-
Pt C, Ch 2, Sec 1Table 4 : Second characteristic numeral
Secondcharacteristic
numeralBrief description of location Frequency range Hz
Displacement amplitude
(mm)
Acceleration amplitude g
1 Machinery spaces, command and control stations, accommodation
spaces, exposed decks, cargo spaces
from 2,0 to 13,2from 13,2 to 100
1,0
0,7
2 Masts from 2,0 to 13,2from 13,2 to 50
3,0
2,1
3 On air compressors, on diesel engines and similar from 2,0 to
25,0from 25,0 to 100
1,6
4,0November 2011 Bureau Veritas Rules for Naval Ships 23
-
Pt C, Ch 2, Sec 2SECTION 2 GENERAL DESIGN REQUIREMENTS
1 Environmental conditions
1.1 General
1.1.1 The electrical components of installations are to
bedesigned and constructed to operate satisfactorily under
theenvironmental conditions on board.
In particular, the conditions shown in the tables in this
Arti-cle are to be taken into account.
Note 1: The environmental conditions are characterised by:
one set of variables including climatic conditions (e.g.
ambientair temperature and humidity), biological conditions,
condi-tions dependent upon chemically active substances (e.g.
saltmist) or mechanically active substances (e.g. dust or
oil),mechanical conditions (e.g. vibrations or inclinations) and
con-ditions dependent upon electromagnetic noise and interfer-ence,
and
another set of variables dependent mainly upon location
onvessels, operational patterns and transient conditions.
1.2 Ambient air temperatures
1.2.1 For ships classed for unrestricted navigation, theambient
air temperature ranges shown in Tab 1 are applica-ble in relation
to the various locations of installation.
Table 1 : Ambient air temperature
1.2.2 For ships classed for service in specific zones,
theSociety may accept different ranges for the ambient air
tem-perature (e.g. for ships operating outside the tropical
belt,the maximum ambient air temperature may be assumed asequal to
+ 40C instead of + 45C).
1.2.3 For ships classed for NBC service, adequate means
ofrefrigeration are to be provided and systems have to with-stand
the maximum temperature expected in NBC condition.
1.3 Humidity
1.3.1 For ships classed for unrestricted service, the humid-ity
ranges shown in Tab 2 are applicable in relation to thevarious
locations of installation.
Table 2 : Humidity
1.4 Cooling water temperatures
1.4.1 The temperatures shown in Tab 3 are applicable toships
classed for unrestricted service.
Table 3 : Water temperature
1.4.2 For ships classed for service in specific zones,
theSociety may accept different values for the cooling
watertemperature (e.g. for ships operating outside the
tropicalbelt, the maximum cooling water temperature may beassumed
as equal to + 25C instead of + 32C).
1.5 Salt mist
1.5.1 The applicable salt mist content in the air is to be1
mg/m3.
1.6 Inclinations
1.6.1 The inclinations applicable are those shown in Tab 4.The
Society may consider deviations from these angles ofinclination
taking into consideration the type, size and ser-vice conditions of
the ships.
1.7 Vibrations
1.7.1 In relation to the location of the electrical compo-nents,
the vibration levels given in Tab 5 are to be assumed.The necessary
damping elements on machinery supportswill be fitted to reach this
level.
1.7.2 The natural frequencies of the equipment, their
sus-pensions and their supports are to be outside the
frequencyranges specified.
Where this is not possible using a suitable
constructionaltechnique, the equipment vibrations are to be dumped
so asto avoid unacceptable amplifications.
1.8 Shock
1.8.1 When required by the Naval Authority and in generalfor
front line ships, shock levels are to be evaluated.
Location Temperature range (C)
Enclosed spaces + 5 + 45
Inside consoles or fitted oncombustion engines and similar
+ 5 + 55
Air conditioned areas + 5 + 40
Exposed decks 25 + 45
Location Humidity
General 95% at 55C
Air conditioned areas Different values may be considered on a
case by case basis
Coolant Temperature range (C)
Sea water 0 + 3224 Bureau Veritas Rules for Naval Ships November
2011
-
Pt C, Ch 2, Sec 2Table 4 : Inclination of ship
Table 5 : Vibration levels
1.8.2 Electrical components are to be so designed, manu-factured
and installed that they are capable of operating sat-isfactorily
under shock conditions.
1.8.3 This capability may be achieved through their
owncharacteristics or through particular installation
arrange-ments.
2 Quality of power supply
2.1 General2.1.1 All electrical components are to be so designed
andmanufactured that they are capable of operating satisfacto-rily
under the variations of voltage, frequency and harmonicdistortion
of the power supply specified from [2.2] to [2.4].
2.2 A.c. distribution systems2.2.1 For alternating current
components the voltage andfrequency variations of power supply
shown in Tab 6 are tobe assumed.
Table 6 : Voltage and frequency variationsof power supply in
a.c.
2.3 D.c. distribution systems
2.3.1 For direct current components voltage variations ofpower
supply shown in Tab 7 are to be assumed.
Table 7 : Voltage variations of power supply in d.c.
2.3.2 For direct current components supplied by
electricalbattery the following voltage variations are to be
assumed:
+ 30% to 25% for components connected to the bat-tery during
charging (see [2.3.2], Note 1)
+ 20% to 25% for components not connected to thebattery during
charging.
Note 1: Different voltage variations as determined by the
charg-ing/discharging characteristics, including ripple voltage
from thecharging device, may be considered.
2.4 Harmonic distortions
2.4.1 For components intended for systems without sub-stantially
static converter loads and supplied by synchro-nous generators, it
is assumed that the total voltageharmonic distortion does not
exceed 5%, and the singleharmonic does not exceed 3% of the nominal
voltage.
Type of machinery, equipment or component
Angles of inclination, in degrees (1)
Athwartship Fore-and-aft
static dynamic (3) static dynamic (4)
Machinery and equipment relative to main electrical power
installation 15,0 22,5 5,0 7,5
Machinery and equipment relative to the emergency power
installation, safety systems of the ship (e.g. emergency source of
power, emergency fire pumps, etc.)
22,5 22,5 10,0 10,0
Switchgear and associated electrical and electronic components
and remote control systems (2)
22,5 22,5 10,0 10,0
(1) Athwartship and fore-and-aft angles may occur simultaneously
in their most unfavourable combination.(2) No undesired switching
operations or functional changes may occur up to an angle of
inclination of 45.(3) The period of dynamic inclination may be
assumed equal to 10 s.(4) The period of dynamic inclination may be
assumed equal to 5 s.
LocationFrequency range
(Hz)Displacement
amplitude (mm)Accelerationamplitude g
Machinery spaces, command and control stations, accommodation
spaces, exposed decks
from 2,0 to 13,2from 13,2 to 100
0,25
0,2
On air compressors, on diesel engines and similar from 2,0 to
25,0from 25,0 to 100
1,6
4,0
Masts from 2,0 to 13,2from 13,2 to 50
1,0
0,7
ParameterVariations
Continuous Transient
Voltage + 6% 10% 20% (recovery time: 1,5 s)
Frequency 5% 10% (recovery time: 5 s)
Note 1: For alternating current components supplied by emergency
generating sets, different variations may be con-sidered.
Parameters Variations
Voltage tolerance (continuous) 10%
Voltage cyclic variation 5%
Voltage ripple (a.c. r.m.s. over steady d.c. voltage)
10%November 2011 Bureau Veritas Rules for Naval Ships 25
-
Pt C, Ch 2, Sec 22.4.2 For components intended for systems fed
by staticconverters, and/or systems in which the static
converterload predominates, it is assumed that:
the single harmonics do not exceed 5% of the nominalvoltage up
to the 15th harmonic of the nominal fre-quency, decreasing to 1% at
the 100th harmonic (seeFig 1), and that
the total harmonic distortion does not exceed 10%.
2.4.3 Higher values for the harmonic content (e.g. in elec-tric
propulsion plant systems) may be accepted on the basisof correct
operation of all electrical devices.
Figure 1 :
3 Electromagnetic susceptibility
3.1
3.1.1 For electronic type components such as sensors,alarm
panels, automatic and remote control equipment,protective devices
and speed regulators, the conducted andradiated disturbance levels
to be assumed are those given inPart C, Chapter 3.
Note 1: See also IEC Publication 60533 - Electromagnetic
Com-patibility of Electrical and Electronic Installations in Ships
and ofMobile and Fixed Offshore Units.
4 Materials
4.1 General
4.1.1 In general, and unless it is adequately protected,
allelectrical equipment is to be constructed of durable,
flame-retardant, moisture-resistant materials which are not
subjectto deterioration in the atmosphere and at the temperaturesto
which they are likely to be exposed. Particular consider-ation is
to be given to sea air and oil vapour contamination.
Note 1: The flame-retardant and moisture-resistant
characteristicsmay be verified by means of the tests cited in IEC
Publication60092-101 or in other recognised standards.
4.1.2 Where the use of incombustible materials or liningwith
such materials is required, the incombustibility charac-teristics
may be verified by means of the test cited in IECPublication
60092-101 or in other recognized standards.
4.2 Insulating materials for windings4.2.1 Insulated windings
are to be resistant to moisture, seaair and oil vapour unless
special precautions are taken toprotect insulants against such
agents.
4.2.2 The insulation classes given in Tab 8 may be used
inaccordance with IEC Publication 60085.
Table 8 : Insulation Classes
4.3 Insulating materials for cables4.3.1 See Ch 2, Sec 9,
[1.3].
5 Construction
5.1 General5.1.1 All electrical apparatus is to be so
constructed as notto cause injury when handled or touched in the
normalmanner.
5.1.2 The design of electrical equipment is to allow
acces-sibility to each part that needs inspection or
adjustment,also taking into account its arrangement on board.
5.1.3 Enclosures are to be of adequate mechanical strengthand
rigidity.
5.1.4 Enclosures for electrical equipment are generally tobe of
metal; other materials may be accepted for accesso-ries such as
connection boxes, socket-outlets, switches andluminaires. Other
exemptions for enclosures or parts ofenclosures not made of metal
will be specially consideredby the Society.
5.1.5 Cable entrance are not to impair the degree of pro-tection
of the relevant enclosure (see Ch 2, Sec 3, Tab 3).
5.1.6 All nuts and screws used in connection with
current-carrying parts and working parts are to be
effectivelylocked.
5.1.7 All equipment is generally to be provided with suit-able,
fixed terminal connectors in an accessible position forconvenient
connection of the external cables.
5.2 Degree of protection of enclosures5.2.1 Electrical equipment
is to be protected against theingress of foreign bodies and
water.The minimum required degree of protection, in relation tothe
place of installation, is generally that specified in Ch 2,Sec 3,
Tab 3.
10
5
1
0,11 3 10 15 100
U U
(%)
ClassMaximum continuous operating
temperature (C)
A 105
E 120
B 130
F 155
H 18026 Bureau Veritas Rules for Naval Ships November 2011
-
Pt C, Ch 2, Sec 25.2.2 The degrees of protection are to be in
accordancewith: IEC Publication No. 60529 for equipment in general
IEC Publication No. 60034-5 for rotating machines.
5.2.3 For cable entries see [5.1.5].
6 Protection against explosion hazard
6.1 Protection against explosive gas orvapour atmosphere
hazard
6.1.1 Electrical equipment intended for use in areas
whereexplosive gas or vapour atmospheres may occur, is to be ofa
"safe type" suitable for the relevant flammable atmosphereand for
shipboard use.
6.1.2 The following certified safe type equipment is
con-sidered: intrinsically-safe: Ex(ia) - Ex(ib) flameproof: Ex(d)
increased safety: Ex(e) pressurised enclosure: Ex(p) encapsulated:
Ex(m) sand filled: Ex(q) special protection: Ex(s) oil-immersed
apparatus (see [6.1.2], Note 1): Ex(o)
Note 1: Only when required by the application.
6.1.3 Other equipment complying with types of protectionother
than those in [6.1.2] may be considered by the Soci-ety, such
as:
simple electrical apparatus and components (e.g. ther-mocouples,
photocells, strain gauges, junction boxes,switching devices),
included in intrinsically-safe circuitsnot capable of storing or
generating electrical power orenergy in excess of limits stated in
the relevant rules
electrical apparatus specifically designed and certifiedby the
appropriate authority for use in Zone 0 or spe-cially tested for
Zone 2 (e.g. type n protection)
equipment the type of which ensures the absence ofsparks and
arcs and of hot spots during its normaloperation
pressurised equipment
equipment having an enclosure filled with a liquid die-lectric,
or encapsulated.
6.2 Protection against combustible dusthazard
6.2.1 Electrical appliances intended for use in areas wherea
combustible dust hazard may be present are to bearranged with
enclosures having a degree of protection andmaximum surface
temperature suitable for the dust towhich they may be exposed.Note
1: Where the characteristics of the dust are unknown, theappliances
are to have a degree of protection IP6X. For most dusts amaximum
surface temperature of 135C is considered adequate.November 2011
Bureau Veritas Rules for Naval Ships 27
-
Pt C, Ch 2, Sec 3SECTION 3 SYSTEM DESIGN
1 Supply systems and characteristicsof the supply
1.1 Supply systems
1.1.1 The following distribution systems may be used:
a) on d.c. installations:
two-wire insulated
two-wire with one pole earthed
b) on a.c. installations:
three-phase three-wire with neutral insulated
three-phase three-wire neutral directly earthed orthrough
impedance
three-phase four-wire neutral directly earthed orthrough
impedance
single-phase two-wire insulated
single-phase two-wire with one phase earthed.
1.1.2 The hull return system of distribution is not to
beused.
1.1.3 The requirement of [1.1.2] does not preclude
underconditions approved by the Society the use of:
a) impressed current cathodic protective systems
b) insulation level monitoring devices provided the circu-lation
current does not exceed 30 mA under the mostunfavourable
conditions.
1.1.4 For the supply systems in HV installations, see Ch 2,Sec
13.
1.1.5 When required by the Naval Authority, for the supplyof
weapon system and shore supply, the STANAG standard1008 NAV is to
be applied. Mainly, the distribution systemsto be of the three
phase three wires with neutral insulated.
1.2 Maximum voltages
1.2.1 The maximum voltages for both alternating currentand
direct current low-voltage systems of supply for theships services
are given in Tab 1.
1.2.2 Voltages exceeding those shown will be speciallyconsidered
in the case of specific systems.
1.2.3 For high voltage systems see Ch 2, Sec 13.
Table 1 : Maximum voltages for various ship services
Use Maximum voltage V
For permanently installed andconnected to fixed wiring
Power equipmentCooking equipmentLightingSpace heaters in
accommodation spacesControl (1), communication (including signal
lamps) and instrumentationequipment
1000500250250250
For permanently installed andconnected by flexible cable
Power and heating equipment, where such connection is necessary
becauseof the application (e.g. for moveable cranes or other
hoisting gear)
1000
For socket-outletssupplying
Portable appliances which are not hand-held during operation
(e.g. refriger-ated containers) by flexible cablesPortable
appliances and other consumers by flexible cablesEquipment
requiring extra precaution against electric shock where an
isolat-ing transformer is used to supply one appliance (2)
(3)Equipment requiring extra precaution against electric shock with
or withouta safety transformer (2) (3)
1000
250250
50
(1) For control equipment which is part of a power and heating
installation (e.g. pressure or temperature switches for
starting/stoppingmotors), the same maximum voltage as allowed for
the power and heating equipment may be used provided that all
componentsare constructed for such voltage. However, the control
voltage to external equipment is not to exceed 500 V.
(2) Both conductors in such systems are to be insulated from
earth.(3) Equipment located in narrow and wet spaces such as
machinery spaces provided with bilge spaces.28 Bureau Veritas Rules
for Naval Ships November 2011
-
Pt C, Ch 2, Sec 32 Sources of electrical power
2.1 General
2.1.1 Electrical installations are to be such that:a) All
electrical auxiliary services necessary for maintain-
ing the ship in normal operational and habitable condi-tions
will be assured without recourse to the emergencysource of
electrical power
b) Electrical services essential for safety will be assuredunder
various emergency conditions
c) When a.c. generators are involved, attention is to begiven to
the starting of squirrel-cage motors connectedto the system, or
other pay load consumers having pulseloads, particularly with
regard to the effect of the magni-tude and duration of the
transient voltage change pro-duced due to the maximum starting or
pulse currentsand the power factor. The voltage drop due to such
cur-rents is not to cause any motor already operating to stallor
have any adverse effect on other equipment in use.
2.2 Main source of electrical power
2.2.1 A main source of electrical power is to be provided,of
sufficient capability to supply all electrical auxiliary ser-vices
necessary for maintaining the ship in normal opera-tional and
habitable conditions without recourse to theemergency source of
electrical power.
2.2.2 For vessels propelled by electrical power and havingtwo or
more constant voltage propulsion generating setswhich constitute
the source of electrical energy for theships auxiliary services,
see Ch 2, Sec 14.
2.2.3 When only one main source of electrical power isprovided,
it is to consist of at least two generating sets.The capacity of
the main generating sets is to be such that inthe event of any one
generating set being stopped it will stillbe possible to supply
those services necessary to providenormal operational
conditions.
Such capacity is, in addition, to be sufficient to start
thelargest motor and to supply pay-load consumers havingpulse loads
without causing any other motor to stop or hav-ing any adverse
effect on other equipment in operation.
2.2.4 For the purpose of calculating the necessary capacity,it
is essential to consider which consumers can be expectedto be in
use simultaneously, in the various operational con-ditions of the
ship.
For a duplicated service, one being supplied electricallyand the
other non-electrically (see [2.2.4], Note 1) (e.g.driven by the
main engine), the electrical capacity is notincluded in the above
calculation.Note 1: It is assumed that the consumers not
electrically driven arecapable to operate satisfactorily in all
conditions.
2.2.5 The services in [2.2.4] do not include: thrusters not
forming part of the main propulsion or
dynamic positioning system
refrigerators for air conditioning other than air
refrigeratorsystems for satisfactory operation of essential
services.
2.2.6 Further to the provisions above, the generating setsshall
be such as to ensure that with any one generator or itsprimary
source of power out of operation, the remaininggenerating sets
shall be capable of providing the electricalservices necessary to
start the main propulsion plant from a"dead ship" condition.
2.2.7 The arrangement of the ship's main sources of electri-cal
power shall be such that essential services can be main-tained
regardless of the speed and direction of rotation ofthe main
propulsion machinery or shafting.
2.2.8 Generators driven by the propulsion plant (shaft
gen-erators) which are intended to operate at constant speed(e.g. a
system where vessel speed and direction are con-trolled by varying
propeller speed) may be accepted asforming part of the main source
of electrical power if, in allsailing and manoeuvring conditions,
and including the pro-peller being stopped, the capacity of these
generators is suf-ficient to provide the electrical power to comply
with[2.2.3] and all further requirements, especially those
of[2.2.6]. They are to be not less effective and reliable thanthe
independent generating sets.
2.2.9 Shaft generator installations which do not complywith the
provisions of [2.2.8] may be used as additionalsources of
electrical power with respect to the power bal-ance provided
that:
a) in the event of a loss of power from the shaft genera-tor(s),
e.g. due to a sudden stopping of the propulsionplant, a standby
generating set is started automatically
b) the capacity of the standby set is sufficient for the
loadsnecessary for propulsion and safety of the vessel
c) the time required to restore these services is not longerthan
45 s.
2.2.10 Where transformers, converters or similar appli-ances
constitute an essential part of the electrical supplysystem, the
system is to be so arranged as to ensure thesame continuity of
supply as stated in this sub-article.
This may be achieved by arranging at least two three-phaseor
three single-phase transformers so that with any onetransformer not
in operation, the remaining transformer(s) is(are) sufficient to
ensure the supply to the services stated in[2.2.3].
Each transformer required is to be located as a separate
unitwith separate enclosure or equivalent.
Where single phase transformers are used, only one spareelement
is required for each different type of transformer ifspecial
precautions are taken to rapidly replace the faultyone.
2.2.11 For ships having qualified automation systems, seePart E,
Chapter 4.
2.2.12 For starting arrangements for main generating sets,see Ch
1, Sec 2, [3.1].November 2011 Bureau Veritas Rules for Naval Ships
29
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Pt C, Ch 2, Sec 32.3 Emergency source of electrical power
2.3.1 Where the main sources of electrical power arelocated in
two or more compartments that are not contigu-ous with each other
and separated in such a way to ensurethe supply to the emergency
services also in case of flood-ing of the maximum number of
contiguous compartmentsaccording to stability regulation (see Part
B), and whereeach source has its own independent self contained
sys-tems, including power distribution and control systems suchthat
a fire in any one of the compartments or other casualtyincluding
the flooding of the maximum number of contigu-ous compartments
according to stability regulation asabove, will not affect the
power distribution from the othermain sources, or to the services
required by [3.5.3], therequirement of this section will be
satisfied without theadditional source of emergency electrical
power (requiredby [2.3.2], provided that:
a) there is at least one generating set complying with
therequirements from [2.3.5] to [2.3.15] and of sufficientcapacity
to meet the requirements of [3.5.3] in at leasttwo non-contiguous
(as prescribed above) compart-ments
b) the generator sets referred to in [2.3.1] (a) and their
selfcontained systems are installed such that one of themremains
operable after damage or flooding in any onecompartment.
2.3.2 A self-contained emergency source of electricalpower shall
be provided.
2.3.3 Provided that suitable measures are taken for
safe-guarding independent emergency operation under all
cir-cumstances, the emergency generator may be used,exceptionally,
and for short periods, to supply non-emer-gency circuits.
Exceptionally is understood to mean conditions, while thevessel
is at sea, such as:
a) blackout situation
b) dead ship situation
c) routine use for testing
d) short-term parallel operation with the main source
ofelectrical power for the purpose of load transfer.
Unless otherwise instructed by the Society, the
emergencygenerator may be used during lay time in port for the
supplyof the ship mains, provided the requirements of [2.4]
arecomplied with.
2.3.4 The electrical power available shall be sufficient
tosupply all those services that are essential for safety in
anemergency, due regard being paid to such services as mayhave to
be operated simultaneously.
2.3.5 The emergency source of electrical power shall becapable,
having regard to starting currents and the transitorynature of
certain loads, of supplying simultaneously at leastthe services
stated in [3.5.3] for the period specified, if theydepend upon an
electrical source for their operation.
2.3.6 The transitional source of emergency electricalpower,
where required, is to be of sufficient capacity to sup-ply at least
the services for the time stated in [3.5.6], if theydepend upon an
electrical source for their operation.
2.3.7 An indicator shall be mounted in a suitable place, ina
continuously manned control position (e.g. platform con-trol room),
to indicate when the batteries constituting eitherthe emergency
source of electrical power or the transitionalsource of emergency
electrical power are being discharged.
2.3.8 If the services which are to be supplied by the
transi-tional source receive power from an accumulator battery
bymeans of semiconductor convertors, means are to be pro-vided for
supplying such services also in the event of failureof the
convertor (e.g. providing a bypass feeder or a dupli-cation of
convertor).
2.3.9 Where electrical power is necessary to restore
pro-pulsion, the capacity of the emergency source shall be
suffi-cient to restore propulsion to the ship in conjunction
toother machinery as appropriate, from a dead ship conditionwithin
30 min. after blackout.
For the purpose of this requirement only, the dead ship
con-dition and blackout are both understood to mean a condi-tion
under which the main propulsion plant, boilers andauxiliaries are
not in operation and in restoring the propul-sion, no stored energy
for starting the propulsion plant, themain source of electrical
power and other essential auxilia-ries is to be assumed available.
It is assumed that means areavailable to start the emergency
generator at all times.
The emergency generator and other means needed torestore the
propulsion are to have a capacity such that thenecessary propulsion
starting energy is available within 30minutes of blackout/dead ship
condition as defined above.Emergency generator or the other means
stored startingenergy is not to be directly used for starting the
propulsionplant.
For steam ships, the 30 minute time limit given can be
inter-preted as time from blackout/dead ship condition definedabove
to light-off the first boiler.
2.3.10 Provision shall be made for the periodic testing ofthe
complete emergency system and shall include the test-ing of
automatic starting arrangements, where provided.
2.3.11 For starting arrangements for emergency generatingsets,
see Ch 1, Sec 2, [3.1].
2.3.12 The emergency source of electrical power may beeither a
generator or an accumulator battery which shallcomply with the
requirements of [2.3.13] or [2.3.14],respectively.
2.3.13 Where the emergency source of electrical power isa
generator, it shall be:
a) driven by a suitable prime mover with an independentsupply of
fuel, having a flashpoint (closed cup test) ofnot less than 43C30
Bureau Veritas Rules for Naval Ships November 2011
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Pt C, Ch 2, Sec 3b) started automatically upon failure of the
electrical sup-ply to the emergency switchboard from the main
sourceof electrical power and shall be automatically con-nected to
the emergency switchboard; those servicesreferred to in [3.5.6]
shall then be transferred automati-cally to the emergency
generating set. The automaticstarting system and the characteristic
of the prime movershall be such as to permit the emergency
generator tocarry its full rated load as quickly as is safe and
practica-ble, subject to a maximum of 45 s, and
c) provided with a transitional source of emergency elec-trical
power according to [2.3.15].
2.3.14 Where here the emergency source of electricalpower is an
accumulator battery, it shall be capable of:
a) carrying the emergency electrical load without recharg-ing
while maintaining the voltage of the battery through-out the
discharge period within 12% above or below itsnominal voltage
b) automatically connecting to the emergency switchboardin the
event of failure of the main source of electricalpower, and
c) immediately supplying at least those services specifiedin
[3.5.6].
2.3.15 The transitional source of emergency electricalpower
required by [2.3.13] c) shall consist of an accumula-tor battery
which shall operate without recharging whilemaintaining the voltage
of the battery throughout the dis-charge period within 12% above or
below its nominal volt-age and be so arranged as to supply
automatically in theevent of failure of either the main or
emergency source ofelectrical power at least the services in
[3.5.6] if theydepend upon an electrical source for their
operation.
2.4 Use of emergency generator in port
2.4.1 To prevent the generator or its prime mover frombecoming
overloaded when used in port, arrangements areto be provided to
shed sufficient non-emergency loads toensure its continued safe
operation.
2.4.2 The prime mover is to be arranged with fuel oil filtersand
lubrication oil filters, monitoring equipment and pro-tection
devices as requested for the prime mover for mainpower generation
and for unattended operation.
2.4.3 The fuel oil supply tank to the prime mover is to
beprovided with a low level alarm, arranged at a level ensur-ing
sufficient fuel oil capacity for the emergency services forthe
period of time as required in [3.5].
2.4.4 The prime mover is to be designed and built for
con-tinuous operation and should be subjected to a
plannedmaintenance scheme ensuring that it is always availableand
capable of fulfilling its role in the event of an emer-gency at
sea.
2.4.5 Fire detectors are to be installed in the location
wherethe emergency generator set and emergency switchboardare
installed.
2.4.6 Means are to be provided to readily change over
toemergency operation.
2.4.7 Control, monitoring and supply circuits for the pur-pose
of the use of the emergency generator in port are to beso arranged
and protected that any electrical fault will notinfluence the
operation of the main and emergency services.
When necessary for safe operation, the emergency switch-board is
to be fitted with switches to isolate the circuits.
2.4.8 Instructions are to be provided on board to ensurethat,
even when the vessel is underway, all control devices(e.g. valves,
switches) are in a correct position for the inde-pendent emergency
operation of the emergency generatorset and emergency
switchboard.
These instructions are also to contain information on
therequired fuel oil tank level, position of harbour/sea
modeswitch, if fitted, ventilation openings, etc.
3 Distribution
3.1 Earthed distribution systems
3.1.1 System earthing is to be effected by means indepen-dent of
any earthing arrangements of the non-current-carry-ing parts.
3.1.2 Means of disconnection are to be fitted in the
neutralearthing connection of each generator so that the
generatormay be disconnected for maintenance or insulation
resis-tance measurements.
3.1.3 Generator neutrals may be connected in common,provided
that the third harmonic content of the voltagewave form of each
generator does not exceed 5%.
3.1.4 Where a switchboard is split into sections
operatedindependently or where there are separate
switchboards,neutral earthing is to be provided for each section or
foreach switchboard. Means are to be provided to ensure thatthe
earth connection is not removed when generators areisolated.
3.1.5 Where for final sub-circuits it is necessary to
locallyconnect a pole (or phase) of the sub-circuits to earth after
theprotective devices (e.g. in automation systems or to
avoidelectromagnetic disturbances), provision (e.g. d.c./d.c.
con-vertors or transformers) is to be made such that
currentunbalances do not occur in the individual poles or
phases.
3.1.6 For high voltage systems see Ch 2, Sec 13.
3.2 Insulated distribution systems
3.2.1 Every insulated distribution system, whether primaryor
secondary (see [3.2.1], Note 1), for power, heating orlighting,
shall be provided with a device capable of contin-uously monitoring
the insulation level to earth (i.e. the val-ues of electrical
insulation to earth) and of giving an audibleand visual indication
of abnormally low insulation values(see Ch 2, Sec 15).Note 1: A
primary system is one supplied directly by generators.Secondary
systems are those supplied by transformers or convertors.November
2011 Bureau Veritas Rules for Naval Ships 31
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Pt C, Ch 2, Sec 33.2.2 For high voltage systems see Ch 2, Sec
13.
3.3 General requirements for distributionsystems
3.3.1 The distribution system is to be such that the failure
ofany single circuit will not endanger or impair essential
ser-vices.
3.3.2 No common switchgear (e.g. contactors for emer-gency stop)
is to be used between the switchboard's bus-bars and two duplicated
essential services.
3.3.3 The system shall be so arranged that the electricalsupply
will be maintained or immediately restored in thecase of loss of
any one of the generators in service. Auto-matic restart of
equipment necessary for propulsion andsteering and to ensure safety
of the ship is also to be pro-vided.
3.3.4 Arrangements are to be provided to prevent overload-ing of
the generating set(s) supplying the electrical powerthat is/are
required to maintain the ship in a normal opera-tional and
habitable condition.
On loss of electrical power, arrangements are to be madefor a
standby generator set to be automatically started, auto-matically
connected to the switchboard within 30 secondsafter loss of power,
and essential services restarted in asshort a time as is
practicable.
These load restart functions may be achieved by the actionsof
suitably trained personnel but in ships with AUT-QAS,AUT-IAS
notations the arrangements are to be automatic.
Where prime movers with longer starting time are used,
thisstarting and connection time may be exceeded uponapproval from
the Society.
3.3.5 Automatic load shedding or other equivalent arrange-ments
are to be provided to protect the generators againstsustained
over-load.
3.3.6 The non-essential services, service for habitable
con-ditions may be shed to ensure the connected generator setor
generator sets are not overloaded.
3.4 Main distribution of electrical power
3.4.1 Where more than one main generator is connected toa main
switchboard, the main bus-bar is to be divided intoat least two
parts which are normally to be connected bycircuit breakers or
other approved means such as circuitbreakers without tripping
mechanisms or disconnectingswitches by means of which bus-bars can
be split safely andeasily.
The connection of generating sets, associated auxiliariesand
other duplicated equipment is to be equally dividedbetween the
parts as far as practicable, so that in the eventof damage to one
section of the switchboard the remainingparts are still
supplied.
The same applies in case of main switchboards supplied byone
generating set and connected to another main switch-board, being
this connection considered as a connection ofa second
generator.
3.4.2 Two or more units serving the same consumer (e.g.main and
standby lubricating oil pumps) are to be suppliedby individual
separate circuits without the use of commonfeeders, protective
devices or control circuits. This require-ment is satisfied when
such units are supplied by separatecables from the a main
switchboard or from two indepen-dent section boards.
3.4.3 A main electric lighting system, which is to
provideillumination throughout those parts of the ship
normallyaccessible to and used by personnel, is to be supplied
fromthe main sources of electrical power.
3.5 Emergency distribution of electricalpower
3.5.1 The emergency switchboard shall be supplied duringnormal
operation from the main switchboard by an inter-connector feeder
which shall be adequately protected at themain switchboard against
overload and short-circuit andwhich is to be disconnected
automatically at the emergencyswitchboard upon failure of the main
source of electricalpower.
Where the system is arranged for feedback operation,
theinterconnector feeder is also to be protected at the emer-gency
switchboard at least against short-circuit.
3.5.2 In order to ensure ready availability of the
emergencysource of electrical power, arrangements shall be
madewhere necessary to disconnect automatically non-emer-gency
circuits from the emergency switchboard to ensurethat power shall
be available to the emergency circuits.
3.5.3 The emergency source of electrical power shall becapable
of supplying simultaneously at least the followingservices for the
periods specified hereafter, if they dependupon an electrical
source for their operation:
a) for a period of 3 hours, emergency lighting at everymuster
and embarkation station and over the sides;
b) for a period of 18 hours, emergency lighting unless,when an
electrical distribution by zones is adopted,alternative
arrangements are provided by movablelamps having their own
dedicated accumulator batteriesfor at least 3 hours operation that
in normal conditionare continuously charged:
1) in all service and accommodation alleyways, stair-ways and
exits, personnel lift cars and personnel lifttrunks
2) in the machinery spaces and main generating sta-tions
including their control positions
3) in all control stations including platform controlroom and
combat system control rooms, machinerycontrol rooms, and at each
main and emergencyswitchboard
4) at all stowage positions for firemens outfits
5) at the steering gear, and
6) at the fire pump referred to in e) below, at the sprin-kler
pump, if any, at the emergency bilge pump, ifany, and at the
starting positions of their motors32 Bureau Veritas Rules for Naval
Ships November 2011
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Pt C, Ch 2, Sec 3c) for a period of 18 hours:
1) the navigation lights and other lights required by
theInternational Regulations for Preventing Collisions atSea in
force and/or by the Naval Authority
2) the radio installation and external communicationsystems
required by SOLAS and or by the NavalAuthority
d) for a period of 18 hours:
1) all internal communication equipment as requiredin an
emergency [3.5.4]
2) the shipborne navigational equipment as requiredby SOLAS and
or by the Naval Authority, includingthose for flight assistance
3) the fire detection and fire alarm systems, and
4) intermittent operation of the daylight signallinglamp, the
ships whistle, the manually operated callpoints and all internal
signals (see [3.5.5]) that arerequired in an emergency, unless such
services havean independent supply for the period of 18 hoursfrom
an accumulator battery suitably located for usein an emergency
e) for a period of 18 hours:
1) one of the fire pumps required by the relevant provi-sions of
Part C, Chapter 4
2) the automatic sprinkler pump, if any, and
3) the emergency bilge pump and all the equipmentessential for
the operation of electrically poweredremote controlled bilge
valves
f) for the period of time required in Ch 1, Sec 11, thesteering
gear where it is required to be so supplied
g) for a period of half an hour, any watertight doorsrequired to
be power operated together with their indi-cators and warning
signals
h) equipment necessary for ship's self defence or a selec-tion
of apparatus of the pay load to be defined case bycase by the Naval
Authority.
3.5.4 Internal communication equipment required in anemergency
generally includes:
a) the means of communication between the navigatingbridge and
the steering gear compartment
b) the means of communication between the navigatingbridge and
the position in the machinery space or con-trol room from which the
engines are normally con-trolled
c) the means of communication for fire fighting and dam-age
control
d) the means of communication for combat system opera-tion
e) the public address system.
3.5.5 Internal signals required in an emergency
generallyinclude:
a) general alarm
b) watertight door alarm and indication system.
3.5.6 The transitional source of emergency electrical powershall
supply for half an hour at least the following services ifthey
depend upon an electrical source for their operation:
a) the lighting required by [3.5.3], items a), b) and c)1),
forthis transitional phase, the required emergency
electriclighting, in respect of the machinery space and
theaccommodation and service spaces may be provided byindividual,
automatically charged, relay operated accu-mulator lamps, and
b) all services required by [3.5.3], items d) 1), d) 3) andd) 4)
unless such services have an independent supplyfor the period
specified from an accumulator batterysuitably located for use in an
emergency.
It is also to supply power to close the watertight doors, butnot
necessarily all of them simultaneously, unless an inde-pendent
temporary source of stored energy is provided andpowers the
control, indication and alarm circuits, for half anhour.
3.6 Shore/Ship supply
3.6.1 Arrangements are to be made for supplying the elec-trical
installation from a source on shore or elsewhere. Atleast a
suitable connection box is to be installed on the shipin a
convenient location to receive the flexible cable fromoutside.
3.6.2 Permanently fixed cables of adequate rating are to
beprovided for connecting the box to the main
distributionsystem.
3.6.3 Where necessary for systems with earthed neutrals,the box
is to be provided with an earthed terminal for con-nection between
the shore's/ship's and ship's neutrals or forconnection of a
protective conductor.
3.6.4 The connection box is to contain a circuit-breaker ora
switch-disconnector and fuses.
The shore connection is to be protected against short-circuitand
overload; however, the overload protection may beomitted in the
connection box if provided on the mainswitchboard.
3.6.5 Means are to be provided for checking the phasesequence of
the incoming supply in relation to the ship'ssystem.
3.6.6 The cable connection to the box is to be providedwith at
least one switch-disconnector on the main switch-board.
3.6.7 The shore connection is to be provided with an indi-cator
at the main switchboard in order