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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 1 of 11
Electrical Safety Procedure Date: 01/11/2011
OR-00-FAT-F21-020
ELECTRICAL SAFETY PROCEDURE
00 01/11/2011 K. Lamb M.J. Dunn K. Feldmann First issue
Rev. Date Prepared Checked Approved Description
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 2 of 11
Electrical Safety Procedure Date: 01/11/2011
Table of Contents
1.0 Purpose
2.0 Scope
3.0 Responsibilities
3.1 Site Manager
3.2 Appointed Person (Electrician)
3.3 Vendors/Subcontractors
3.4 Site HSE Manager
3.5 Employees
4.0 Electrical Systems
4.1 Testing of Temporary Electrical Installations
4.2 Use of Reduced Voltage Electrical Tools and Equipment
4.3 Security of Electrical Installations
4.4 Protection of Electrical Cable
4.5 Electrical Connections
5.0 Inspections
5.1 Testing
5.2 Portable Electrical Hand Tools
6.0 Safe Working Methods
6.1 Lockout and Tagout
6.2 Permit to Work
7.0 Working Near Overhead Power Lines
8.0 Underground Services
8.1 Use of Cable and Pipe Locators
8.2 Sweeping
8.3 Digging Mechanical or manual
8.4 Exposure and Protection
8.5 Reporting Damage
9.0 Working In Confined Spaces
9.1 Use of Low Voltage Electrical Equipment
9.2 Grounding/Earthing Requirements
10.0 Forms/Reports
11.0 Records
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 3 of 11
Electrical Safety Procedure Date: 01/11/2011
1.0 PURPOSE
To ensure that a standard approach is taken in the control and
management of the temporary electrical systems used on the project
by FATA Gulf.
2.0 SCOPE
This section covers the safety of temporary electrical
installations on the project as well as the use of electrical tools
and equipment. FATA Gulf is responsible for ensuring the safety of
all temporary electrical installations and for ensuring the risks
associated with using electrical tools and equipment is kept as low
as possible. This procedure is mandatory and applies to all
construction projects being undertaken by FATA Gulf.
3.0 RESPONSIBILITIES
3.1 Site Manager
The Site Manager shall ensure that all electrical systems at the
work site are managed in a safe manner. In order to ensure that
this procedure is followed he shall appoint competent Electricians
to carryout work on electrical systems.
3.2 Appointed Person (Electrician)
The appointed person (Electrician) shall be responsible for the
application of this procedure and ensuring that all electrical
systems are inspected periodically and all electrical systems are
maintained in good working order. All persons employed as
electricians must be competent and be in the possession of a
recognised electrical qualification. FATA Gulf will ensure that any
persons working on electrical installations including temporary
electrics are competent.
3.3 Vendors/Subcontractors
Vendors/Subcontractors shall be responsible for implementing
this procedure and ensuring that all necessary steps are taken to
protect the workforce and other person(s) who may be working in the
vicinity.
3.4 Site HSE Manager
The Site HSE Manager shall assist the Site Manager in the
implementation of this procedure and provide the necessary Health
& Safety advice to ensure compliance. 3.5 Employees
Use portable electrical equipment only for the purpose it has
been provided and in accordance with any information, instruction
or training received. Carry out pre-use visual checks of portable
electrical equipment (including when issued new equipment) as
outlined in 5.2.1. Immediately report to their Supervisor/Foreman
any fault or defect to portable electrical equipment or if they
notice that a test record (label) is out-of date. [Note: If there
is safety concerns cease use and immediately disconnect the
equipment from the power source.]
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 4 of 11
Electrical Safety Procedure Date: 01/11/2011
4.0 ELECTRICAL SYSTEMS
4.1 Testing of Temporary Electrical Installations
Vendors/Subcontractors will ensure that all temporary electrical
installations are tested by a competent electrician and that a
certificate is issued for each distribution board. A copy of the
certificate shall be held in a plastic wallet and fixed to the
distribution board so that it is easily available for inspection.
All temporary electrical installations must be earthed and the
resistance of the earthing must be checked to ensure it meets the
level required under electrical safety guidelines from the
generator manufacturer or local mains supplier in the case of mains
supply. In the absence of any guidance from the generator
manufacturer the earth rod shall be driven to a depth so that it
penetrates the summer water table by 2 metres and the resistance of
any point in the earth continuity system does not exceed 0.5
ohms.
4.2 Use of Reduced Voltage Electrical Tools and Equipment
Vendors/Subcontractor will ensure that all electrical hand tools
and machinery such as circular saws operate at 110v through a step
down transformer. All 110v leads connected to the transformer and
run across site are to be Yellow in colour. The only exception
allowed will be where certain tools or machinery are not available
in the reduced voltage. In this case where 230v or greater are used
a Residual Current Device (RCD) must be fitted with a 30mA trip.
The requirement for the use of 110v shall also extend to temporary
lighting.
4.3 Security of Electrical Installations
Vendors/Subcontractor will ensure that all electrical
installations are secured. Distribution boards must be locked shut
and under no circumstances shall live conductors be exposed where
workers could accidentally come into contact with them. Clear
warning signage must be displayed on all electrical installations
and only competent electricians are to have access to distribution
boards.
4.4 Protection of Electrical Cable
Vendors/Subcontractor will ensure that all electrical cables
running from a generator to the distribution board are mechanically
protected. The preferred method will be the use of steel wire
armoured (SWA) cable to ensure that the risk of electric shock from
cable damage is greatly reduced. All connections in cables are to
be made by a competent electrician and with proprietary connectors
under no circumstances are joints to be made using solely
electrical tape. Cords, leads and hoses shall be kept at least 2.0
meters off the ground or whatever height is necessary to be
protected from traffic and prevent tripping hazards. Electrical
power and extension cords and welding cables/leads and hoses shall
not be coiled while in use.
4.5 Electrical Connections
Vendors/Subcontractor will ensure that all electrical
connections are made using plugs and sockets that meet the
requirements of BS4343. These connections should be either the
waterproof or splash proof design under no circumstances are
domestic 2 or 3 pin plugs or sockets to be used. It is strictly
prohibited for bare electrical cable ends to be pushed into
electrical sockets in order to make a circuit.
5.0 INSPECTIONS
5.1 Testing
Every installation should be tested in accordance with the IET
Regulations at three-monthly intervals or shorter periods if
necessary by an electrician. The record of any testing and
inspections should be made by a responsible person on the
appropriate certificates Testing and inspections must include:
a visual inspection
the continuity of final circuit conductors
the continuity of protective conductors
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 5 of 11
Electrical Safety Procedure Date: 01/11/2011
the earth electrode resistance
the insulation resistance
polarity
the earth fault loop impedance
the correct operation of residual current
devices and fault voltage operated
protective devices
Weekly inspections should be made of the whole system, including
all portable electric tools. Records should also be kept of all
these inspections.
5.2 Portable Electrical Hand Tools
An appropriate maintenance system should be established for all
portable electrical equipment and should include user checks,
regular visual inspections and combined inspection and electrical
testing as necessary. It is recommended that all portable and
handheld tools should have the following inspection and testing
facilities.
User check before use
Visual Weekly Inspection recorded
Combined inspection and test before first use and thereafter
three-monthly recorded and colour coded.
5.2.1 Visual Inspection Guidance
Visual inspections are usually the most important components of
a portable electrical equipment maintenance regime. The majority of
potentially dangerous faults can be picked up by such inspections,
which are normally carried out by users themselves and/or
periodically by a competent person.
Any visual inspection should critically examine the equipment to
check that it appears to be in sound condition and should include
any extension leads and associated plugs and sockets. User visual
inspections should not include taking any equipment apart. When
carrying out a visual inspection ensure the electrical equipment is
turned off and check for:
Damage to plugs (e.g. cracked casing or bent pins)
Damage to the external cover/casing of the equipment, loose
parts or loose/missing screws
Damage to outer coverings/insulation to leads, wires or cables
(apart from light scuffing).
Cable located where it might be subject to damage or forced into
a tight bend as it exits equipment.
Inadequate joints, including taped joints in the cable
Burn marks, staining or discoloration that may suggest
overheating
Whether the equipment has been subjected to conditions for which
it is not suitable, e.g. spillage of fluids or solids, overly dirty
or dusty, or excessively contaminated in some other way.
The absence of inappropriate pieces of equipment or foreign
objects on or inside the equipment
The formal inspection by a competent electrician (not the user)
may also include checking the plug by removing the plug cover,
particularly if there are any concerns (not applicable for moulded
plugs, where only the fuse can be checked). This would only involve
checking the correct fuse for the equipment is in use, the cord
grip is effective, the cable terminations are secure and correct
(including an earth where appropriate), and that there are no signs
of internal damage, overheating or entry of liquid or foreign
matter. Further guidance is given in the table and diagram below.
Should a visual inspection indicate equipment to be unsafe for use
(or reveal the lack of a valid PAT test where required) it should
be reported to management and immediately taken out of use
(disconnect from the power source and, if necessary, label as
faulty and/or disable by removing the plug). This action should be
noted on the register and arrangements made for any necessary
repair or replacement.
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
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Electrical Safety Procedure Date: 01/11/2011
5.2.2 Inspection & Test Frequencies
Equipment/Application Voltage User Check
Formal Visual Inspection
Combined Inspection &
Test
Battery-operated power tools and torches
Less than 25 volts
No No No
25V Portable hand lamps (confined for damp conditions)
25 volt Secondary winding from transformer
No No No
50V Portable hand lamps Secondary winding centre tapped to earth
(25 volt)
No No Yearly
110V Portable and hand-held tools, extension leads, site
lighting, moveable wiring systems and associated switchgear
Secondary winding centre tapped to earth (55 volt)
Weekly Monthly Before first use on site, then every 3 months
230V Portable and hand-held tools, extension leads and portable
floodlighting
230 volt mains supply through 30mA RCD
Daily/every shift
Weekly Before first use on site and then monthly
230V Equipment such as lifts, hoists and fixed floodlighting
230V Supply fuses or MCBs
Weekly Monthly Before first use on site, then every 3 months
RCDs Fixed** Daily/every shift
Weekly *Before first use on site, then every 3 months
Equipment in Site Offices 230 volt Office Equipment
Monthly 6 Monthly Before first use on site and then yearly
* Note: RCDs need a different range of tests to other portable
equipment, and equipment designed to carry out appropriate tests on
RCDs will need to be used.
** It is recommended that portable RCDs are tested monthly
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 7 of 11
Electrical Safety Procedure Date: 01/11/2011
6.0 SAFE WOKING METHODS
6.1 Lockout and Tagout (OR-00-FAT-F21-014)
FATA GULF will ensure that all workers are trained in the
correct isolation procedures, including Lockout/Tagout,
identification of isolation points using plant drawings, Owners
safety requirements and emergency procedures. The safety measures
to be implemented for this procedure are:
Identify all energy sources connected with the work.
Disable, redirect, or stop all energy from doing what it
normally does.
Confirm that youve reached a zero energy state.
Apply restraint devices to keep the system from starting up
while you work on it.
Gravity may cause a mechanical device to drop even though all
energy sources have been
disconnected, physically blocking the equipment may be necessary
to prevent injury.
Check with staff at industrial sites regarding the necessity of
obtaining lock out permits and follow
the plant procedure.
Restraint devices, (chains, locks, scissors, blocking), on
mechanical, electrical, and physical
energy sources must be tagged.
Tags indicate who you are, who you work for, what equipment is
locked out and when it was
locked out, as well as who to contact in case of emergency.
Construction sites must have formal lockout procedures and
permits to identify all energy sources
- trace wiring,
- piping, and
- all lines in and out of the equipment or area.
Refer to drawings, specifications operating manuals etc.
Once each energy source has been identified and de-energized,
testing must be performed to
verify a zero energy state.
Lockout can be simple locking out an electrical panel box while
installing a stringer of temporary
lighting.
6.2 Permit To Work (OR-00-FAT-F21-012)
Permit To Work systems are essential to ensure safe working and
freedom from hazards where high-voltage electrical supplies, cables
and equipment exist, particularly in installation, maintenance or
construction work. The Permit To Work must only be issued by an
appointed and authorised person. They must be signed by an
authorised person and by the competent person carrying out the
works described on the permit. The authorised person should keep a
record of all permits that are issued and cancelled on the project,
a copy of all Permit To Work are to be held in the Site HSE Office.
Before work starts, the authorised person should ensure that the
Permit To Work will cover the making safe from all possible sources
of supply. The Site HSE Manager should monitor what permits have
been issued and that the permit is being adhered to by the persons
who it has been issued to.
Under no circumstances should anyone work on, maintain, repair
or otherwise adjust high voltage apparatus except in accordance
with the instructions and terms of a formal permit to work.
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 8 of 11
Electrical Safety Procedure Date: 01/11/2011
7.0 WORKING NEAR OVERHEAD POWER LINES
The local electricity authority should be consulted before any
work commences and a safe system of work should be devised and
implemented
Practical steps that can be taken to prevent danger from any
live cable or apparatus could include the placing of adequate and
suitable barriers.
Any ground level barriers should consist of either:
a. A stout post and fence rail. b. A tension wire fence, earthed
at both ends, flags on the wires. c. Large steel drums filled with
rubble or concrete, placed at frequent levels. d. Substantial
timber baulks, to act as wheel stops. There should be a general
rule prohibiting the storage of materials in the area between the
overhead lines and the ground level barriers. Precautions are
necessary even though work in the vicinity of the line may be of
short duration.
All work must be carried out under the supervision of a
competent person/responsible supervisor who is familiar with the
hazards associated and likely to be encountered.
8.0 UNDERGROUND SERVICES
The greatest risk of injury lies in contacting electricity
cables. Some people are electrocuted, but the majority suffer burns
from the explosive arcing of the damaged cable. Most injuries are
caused to persons using pneumatic drills or jackhammers and involve
415-volt cables within 0.5 metres of the surface.
If mobile cranes or excavators are used, the minimum distance
from the ground level barrier to the line should be length of jib
plus 9 metres if slung on a wooden pole and 15 metres if slung
on a metal post or pylon
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
Page: 9 of 11
Electrical Safety Procedure Date: 01/11/2011
8.1 Use of Cable and Pipe Locators
A wide range of instruments are available for the detection of
buried services. Several different principles may be applied in the
task of detection and an instrument may incorporate more than one
of these:
a. Hum Detection
Virtually all electricity cables give off or radiate a magnetic
field while current is actually flowing through them. This magnetic
field or hum is usually easy to detect.
b. Radio Frequency
Metal pipes and cables can act like radio and re-broadcast low
and very low frequency radio signals, which can be detected.
c. Transmitter and Receiver
A small portable transmitter or signal generator can be
connected to a cable or pipe, or so placed very close to it so that
the signal is fed into or inducted in the pipe or cable.
d. Metal Detectors
Conventional metal detectors will usually locate flat metal
covers, joint boxes, etc, but may miss round cables or pipes.
8.2 Sweeping
It is essential to sweep an area as shown in the diagram
below.
8.3 Digging Mechanical or manual Once the approximate location
of a service has been identified using all available information,
trial holes should be dug carefully by hand, to establish the exact
location and depth of the service. Where two holes are dug at
intervals, it should not be assumed that the service runs in a
straight line between them.
Mechanical excavators and power tools should not be used within
0.5 metres of the indicated line of a service, unless prior
agreement on a safe system of work has been reached with the
service owner.
Excavations must be supported adequately, especially if more
than 1.2 metres deep or dug in poor ground or at a location exposed
to traffic vibration or near a building etc.
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Oman Rolling Mill Project No.: OR-00-FAT-F21-020
Contract for Rolling Mill Plant in Sohar Rev: 00
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Electrical Safety Procedure Date: 01/11/2011
8.4 Exposure and Protection When a service is exposed in the
bottom of a trench or excavation, it should be protected with
suitable timber or other material to prevent it becoming
damaged.
A service across a trench or along a trench above the bottom
should be supported by slings or props, to avoid unnecessary
stresses. If in doubt, consult the service provider. 8.5 Reporting
Damage
Any damage to buried services must be reported to the owners.
Most damage to the sheath of a cable or to coating on a pipe can
result in moisture penetration, corrosion and subsequent
failure.
9.0 WORKING IN CONFINED SPACES (OR-00-FAT-F21-013)
9.1 Use of Low Voltage Electrical Equipment
Inside conductive confined spaces, low voltage (24 volt or less)
lighting must be used. Cables to be used in confined spaces shall
be heavy duty neoprene rubber cables, carefully inspected, to
ensure there is no damage or deterioration, by a competent
electrician, and installed overhead as much as practicable.
Protection shall be given to all cables as they enter into the
confined space / vessel to ensure they are not damaged by sharp
edges.
9.2 Grounding/Earthing Requirements
Grounding/earthing shall be provided for all electrical
equipment. Grounding/earthing cables shall have their continuity
and conductivity checked by a competent electrician.
10.0 RECORDS
All records and documentation relating to this procedure shall
be maintained at the Site Office by the Site HSE Manager and will
be made available for auditing purposes at mutually convenient
times.