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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 1
SECTION 26 05 33.13
ELECTRICAL BOXES AND FITTINGS
PART 1: GENERAL 1.01 SECTION INCLUDES
All types and sizes of electrical boxes and fittings including,
but not limited to the following:
1. Outlet boxes.
2. Weatherproof outlet boxes.
3. Junction/pull boxes.
4. Cabinets/enclosures.
5. Floor boxes.
6. Conduit bodies.
7. Fittings.
1.02 RELATED SECTIONS
A Section 0133 00 Submittals Procedures.
B Section 01 61 00 Common Product Requirements.
C Section 01 78 36 Warranties
D Section 26 05 00 Common Work Results for Electrical.
E Section 26 05 53 Electrical Identification.
F Section 26 05 33 Electrical Raceways.
G Section 26 05 29 Equipment Connections and Supports.
H Section 26 27 26 Wiring Devices.
I Section 26 29 00 LV Controllers.
J Section 33 71 73.13 Electric Meters.
K Section 26 24 16 Panel Boards.
1.03 REFERENCES
A SASO Saudi Arabian Standards Organization.
B IEC 60364 Electrical Installations of Buildings.
C IEC 60529 Degrees of Protection provided by Enclosures (IP
Code).
D BSEN 10346 Continuously Hot-Dip Zinc Coated Steel Flat
Products.
E BSEN 12844 Zinc and Zinc Alloys for Castings -
Specifications.
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 2
F BS 7671 Requirements for Electrical Installations (IEE Wiring
Regulations).
G NFPA 70 National Electrical Code (NEC).
H SEC DPS SEC Distribution Planning Standards.
I SEC SDMS SEC Distribution Materials Specifications.
J SEC SDCS SEC Distribution Construction Standards.
1.04 SUBMITTALS
A Comply with section 01 33 00.
B Submit manufacturer's catalogues and technical data including
dimensions of all electrical boxes and fittings.
C Submit samples of each type of proposed boxes and
fittings.
1.05 QUALITY ASSURANCE
A Manufacturers: Firms regularly engaged in manufacture of
electrical boxes and fittings of all types and sizes required,
whose products have been in satisfactory use in similar service for
not less than 5 years. Preference shall be given to local
manufacturers and agents/suppliers.
B Installer: Firms regularly engaged and qualified with at least
5 years of successful installation experience on projects with
electrical installation work similar to that required for this
project.
1.06 DELIVERY, STORAGE AND HANDLING
A Comply with section 01 61 00.
B Store electrical boxes and fittings indoors with appropriate
protection against corrosion and damage.
1.07 WARRANTY
A Comply with section 01 78 36.
1.08 SEC/MUNICIPALITY COMPLIANCE
A Contractor shall comply with all applicable SEC distribution
material specification, construction and planning standards for
power distribution networks and municipality specification for road
lighting. Some of the specifications and standards are attached
with the contract documents for guidance, however contractor shall
obtain copy of all applicable specification and standards from the
concerned authorities as required on site or instructed by the
Engineer.
B Any conflict found between this project specification and SEC
or municipality specification/standards shall be immediately
brought to the notice of Engineer for final decision.
PART 2: PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 3
Not Used.
2.02 OUTLET BOXES
A Provide galvanized flat, rolled sheet steel interior outlet
wiring boxes of types, shapes, sizes and depths to suit each
respective location and installation. Construct threaded screw
holes with corrosion-resistant screws for securing box covers and
wiring devices.
B Provide a terminal with screw inside the box for grounding
connection of all metallic outlet boxes with appropriate earth
mark.
C Accessories for outlet boxes such as mounting brackets,
wallboard hangers, extension rings, fixture studs, grounding
connection, cable clamps, metal straps for supporting outlet boxes,
etc. shall be compatible with outlet boxes being used and
fulfilling requirements of individual wiring situations.
D Exposed or surface mounted boxes, when used with rigid steel
conduits, shall have threaded hubs. These boxes shall be cast from
ferro-alloy or malleable iron, hot-dip galvanized.
E Ceiling boxes shall be 75 mm circular or square, and 50 mm
deep complete with fittings where required to support fixtures.
F Provide gang boxes at locations where more than one device is
to be mounted.
G Provide combination boxes with barriers for wiring of more
than one system.
H Provide panel mounted fixing frames where outlet boxes are
installed in paneling.
I Outlet box shall be of adjustable grid type.
J All circular PVC boxes where used to support light fittings
shall be provided with steel insert clips.
2.03 WEATHERPROOF OUTLET BOXES
A Provide weatherproof outlet boxes for interior and exterior
locations exposed to weather or moisture or where shown on the
drawings.
B Provide corrosion-resistant cast metal weatherproof outlet
wiring boxes of types, shapes, sizes and depths to suit each
location and installation as shown on the drawings.
C Weatherproof outlet boxes shall be provided with threaded
conduit ends, terminal with screw for ground connection, cast metal
face plates with spring-hinged waterproof caps, suitably configured
for each application, including face plate gaskets and corrosion
resistant fasteners.
D All weatherproof outlet boxes shall be provided with corrosion
free epoxy powder coat, to provide corrosion resistance with
appropriate gasket.
E For outdoor applications and areas with corrosive atmosphere,
boxes for use with PVC coated steel conduits shall be galvanized
cast boxes with a PVC factory applied coating of 40 mm minimum
thickness. Boxes shall have hubs with extruded sleeves extending
the hubs.
F The outlet boxes in hazardous (classified) locations and
special occupancies shall conform to NEC, Chapter 5, articles 500
through 517.
2.04 JUNCTION/PULL BOXES
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 4
A Provide hot-dip galvanized, zinc coated, code gauge sheet
steel junction and pull boxes with screws on cover, of types,
shapes, sizes and depths to suit each respective location and
installation. Minimum depth shall be 50 mm.
B Junction/pull boxes shall be provided with welded seams and
appropriate cast covers, equipped with stainless steel nuts, bolts,
screws, washers and terminal with screw for ground connection.
C All junctions on lighting, power, signaling, communications,
alarms and control wiring shall be provided with terminal strips.
Terminal strips shall have screw type terminals and cable
identification strip.
D Sufficient draw-in/pull boxes shall be provided to permit easy
wire pulling during installation as well as for maintenance.
E Not more than two right-angled bends or 10 meter length of
conduit shall be permitted between draw boxes. Vertical conduit
runs more than 3 meter shall provide cable support using a draw-in
box.
2.05 CABINETS/ENCLOSURES
A Provide cabinets/enclosures with welded seams and appropriate
cast covers, equipped with stainless steel nuts, bolts, screws,
washers and terminal with screw for ground connection.
B Cabinets/enclosures shall be provided with hinged covers,
where required.
C Cabinets/enclosures shall be provided with reinforced steel
back plates for mounting interior components, and to ensure
rigidity and accurate alignment.
2.06 FLOOR OUTLET BOXES
A Provide corrosion resistant, hot-dip galvanized, zinc coated
sheet steel floor outlet boxes of the types, shapes, sizes and
depths to suit each respective location and installation. The floor
outlet boxes shall be suitable for raised floor trunking or under
floor ducting system as required.
B Depths of floor outlet boxes shall be sufficient to
accommodate conduit entries from sides and all kinds of wiring
devices with plugs from the top.
C Cover of floor outlet boxes shall be capable of closing
completely after installation of plugs and connecting devices
inside the box. The cover shall be suitable for flush floor
installation with provision of fixing carpet, vinyl sheet, etc.
above the cover to match with the finish of the floor.
D Floor outlet boxes shall be waterproof when fully closed.
Appropriate rubber grommet for cable protection shall be available
for cable outlets from the floor base. The grommets shall have an
automatic lock function that prevents the cables from getting cut
should traffic pass over the box. The trap shall be fully
reversible to allow for change of direction of cable exit without
the need to remove the trap frame.
E The floor outlet boxes shall have a fully flexible plate
configuration within them to ensure that difficult configurations
are achieved with ease.
F Service outlet boxes for raised floor trunking system shall
comprise an electro-galvanized steel base frame to be installed in
the raised floor tile. A die cast zinc alloy service outlet frame
and trap shall be mounted in the base frame. The base unit, service
outlet frame and traps shall have an oven baked epoxy powder paint
finish for protection against rust and corrosion. Provide flexible
conduit of minimum 3 meter length to connect the service outlet box
to the raised floor trunking.
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 5
G Provide service outlet boxes and junction boxes for under
floor ducting system, constructed from high pressure zinc alloy die
casting base frame and fixed to heavy gauge hot-dip galvanized
steel base plate adequate in strength and performance. These boxes
shall comply with the following requirements:
1. The design of the base frame shall cast the whole unit in one
piece without any joints/fabrication to prevent corrosion and
concrete slippage into the box during casting of concrete or
screeding. The boxes shall be constructed with provisions for
ducting or conduit access on all four sides. Unwanted entries shall
be blanked off with detachable side blanks. All exposed portion of
the boxes shall be epoxy coated.
2. Cover for service outlet boxes shall be made of high pressure
zinc alloy die casting provided with suitable hinges designed to
enable the trap cover to open through 180 degrees and giving access
at all times to the power, data, telephone and other outlets.
3. Covers for service and junction boxes shall be made of high
pressure zinc alloy die casting secured by counter sunk screws. The
covers shall be provided with recess to accept the same floor
finish.
4. All boxes shall be adjustable in height, independent of the
ducting system to take account of difference in floor / screed
thickness.
5. Adequate segregation shall be provided between service runs
within junction boxes by using cross-over bridges and rigid
compartments.
6. Cables emerging from service outlet boxes shall be protected
against damage by means of nylon cable-exit grommets or equivalent
and approved material and shall be reversible to close position
when not in use. The lifting handle and cable grommets shall be
provided in opposite sides of the trap cover to allow easy access
to lifting handle and to avoid damage of the cable insulation.
H All floor outlet boxes shall be complete with waterproof
gasket and circuit protective conductors between the covers and the
boxes.
I Provide combination of slab boxes under raised floor and PVC
grommets flushed with raised floor tile when required and shown on
the drawings for raised floor trunking system. The slab box shall
be constructed from hot-dip galvanized sheet steel suitably sized
to accommodate all power, data, telephone and other outlets fixed
on top cover plate or on the sides as required and approved by the
Engineer. The grommets with lid shall be suitable for the raised
floor tile and have opening sufficient to allow passage of all the
cables and plugs through it.
2.07 CONDUIT BODIES
A Provide galvanized conduit bodies of types, shapes and sizes
such as capped elbows and service entrance elbows to suit
respective locations and installation, with corrosion-resistant
screws for fixing.
B Conduit bodies and covers shall be constructed from the same
material and shall have the same finish or protective coating as
that of associated conduits.
C Conduit bodies shall be appropriately threaded for conduits
and equipped with corrosion resistant screws for fixing inspection
covers.
D Weatherproof conduit bodies and covers shall be provided with
corrosion-free epoxy powder coat, to provide resistance again
corrosion. Covers shall be gasketed.
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 6
2.08 FITTINGS
A Provide corrosion-resistant fittings for electrical boxes such
as punched-steel box knockout closures, conduit locknuts, malleable
iron conduit bushings, offset connectors, covers of types and sizes
to suit respective uses and installation.
B Covers of junction/pull boxes, cabinets/enclosures, etc. shall
be of the same thickness and material as that of the box and shall
be reinforced where required due to size. Screws for covers shall
be stainless steel or high quality brass.
PART 3: EXECUTION 3.01 PREPARATION
A Determine exact locations of outlets on site after
co-ordination with architectural, furniture and equipment
layouts.
B Locations of junction/pull boxes and other fittings and
accessories are generally not shown on the drawings, but contractor
shall provide these in compliance with applicable requirements,
ease of maintenance, manufacturers written instructions and
recognized industry practices.
3.02 GENERAL
A Coordinate installation of electrical boxes, fittings and
cabinets/enclosures with wire/cable and raceway installation
work.
B Provide knockout closures in all types of electrical boxes and
cabinets/enclosures to cap unused knockout holes where blanks have
been removed.
C Install all types of boxes and conduit bodies at accessible
locations to ensure easy installation and maintenance of electrical
wiring.
D Provide electrical and earth connections for all types of
electrical boxes and cabinets/ enclosures.
E Fastenings for all types of exposed/surface mounted electrical
boxes shall not penetrate more than 30 mm into reinforced concrete
beams or more than 20 mm into reinforced concrete joists and shall
not contact main reinforcing steel.
F All types of outlet boxes and conduit bodies shall be
supported at 150 mm (approx) from each side.
3.03 OUTLET BOXES INSTALLATION
A Provide interior or weatherproof outlet boxes for each light
fixture, receptacle, equipment connection and other conduit
termination points.
B Avoid using round boxes where conduit must enter through side
of box, which would result in difficult and insecure connections
when fastened with locknut or bushing on rounded surface.
C Fasten boxes rigidly to substrate or structural surfaces, or
solidly embed electrical boxes in concrete or masonry.
D Boxes and supports shall be fastened with toggle bolts on
hollow masonry units and with machine screws or welded studs on
steel work.
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 7
E In open overhead spaces, cast metal boxes threaded to raceways
need not be separately supported except where used for fixture
support. Support cast metal boxes having thread-less connectors and
sheet metal boxes directly from the building structure or with bar
hangers.
F Where conduit supported outlet boxes are installed and conduit
is suspended from the structure with hangers, attach hangers to
raceways on opposite sides of the box and support with approved
fasteners not more than 1 m measured each side from the box.
G In suspended ceilings where outlet boxes support fixtures in
which the ceiling suspension system does not have sufficient
strength to prevent visible deflection of the ceiling surfaces,
boxes shall be supported by structural members, secured to the
building structure.
H Covers of outlet boxes shall not be used to support
fixtures.
I Locate boxes in hung ceiling spaces so that they do not
interfere with the removal of ceiling tiles or equipment.
J Where outlet boxes are installed flush in exposed concrete
blocks in finished areas, blocks shall be cut by using appropriate
tools as approved by the Engineer. Ensure that openings are cut to
fit boxes so that edges of openings are not visible after
installation of cover plates. The use of mortar to patch oversize
or ragged openings will not be permitted.
K Do not mount boxes between the same pair of studs, on opposite
sides of sound-rated partitions. Seal spaces between boxes and
gypsum board with acoustical sealant.
L Outlet boxes shall be secured by sheardized class 1 or
stainless steel screws of a minimum size of 30 mm x No.8 or
equal.
3.04 JUNCTION/PULL BOXES INSTALLATION
A Requirement for pull boxes shall be determined based on
maximum allowable conduit runs to facilitate the pulling-in of
cables/wires, as described in section 26 05 33 (Electrical
Raceways).
B Where pull boxes (existing and new) are connected to conduits
running underground in the site, they shall be provided with
suitable provision for draining.
C Locate junction and pull boxes so as to be accessible at all
times. Boxes may be installed in mechanical, electrical, storage or
janitor rooms or in hung ceiling space.
D Provide access hatches for junction/pull boxes installed in
ceiling spaces unless ceiling tiles are of lay-in or snap-in
type.
E Locate junction and pull boxes so that piping, ductwork or
equipment will not restrict or block access.
F Cables connected to terminals or passing through boxes shall
be identified on the strip and by cable markers.
G Terminal strips may be omitted where there are less than 3
connections in a junction box, but all conductors shall be
identified by cable markers.
H Terminals may be omitted for through cables which are not
broken at a junction box.
3.05 FLOOR OUTLET BOXES INSTALLATION
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MINISTRY OF HOUSING Western Sector Projects Sitework &
Infrastructure OMRANIA and ASSOCIATES Project Specification
ELECTRICAL BOXES AND FITTINGS SECTION 26 05 33.13 - 8
A Mark the locations of all service outlet boxes and junction
boxes on the floor slab as per approved shop drawings, and review
all practical aspects before start of installation.
B Cover junction boxes and service outlet boxes in under floor
ducting system with the disposable screeding lids, approximately
leveled and tapped to ensure no cement/mortar gets into the boxes
during screeding.
C Adjust floor outlet boxes so that closure plates are flush
with the surface of the floor tile, or the floor if carpeting is
specified. Provide under floor duct fittings and outlets or single
flush outlets with waterproof covers, as indicated on the
drawings.
END OF SECTION
SECTION 26 05 33.13