Page 58 - RotF - Electrical Specification_Neat

GENERAL ELECTRICAL SPECIFICATION
Version 2014-2

2.9.2.2 Installation

The trunking shall be adequately fixed at intervals not exceeding one metre. Fixing holes
shall be slotted to allow for any subsequent expansion due to temperature variations.
Plastic trunking shall not be installed where ambient temperatures are expected to
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exceed +60 C or fall below -5 C. Care shall be taken to ensure that the trunking is not
deformed by fixings, this applies particularly when trunking is fixed to an uneven surface.
Packing pieces shall be introduced in order that the trunking shall be securely fixed level
and plumb without being deformed.

Cable retaining strips shall be fitted at one metre intervals unless trunking is installed with
the cover on the top side.

Plastic trunking shall be fitted with manufacturer's standard tees, off-sets and other
fittings where changes of direction occur. Where trunking terminates manufacturer's
standard end plates and flares shall be fitted to connect to items of equipment.

Joints shall be effected using the manufacturer's standard internal connectors, and in
accordance with the manufacturer's recommendations.
Separate protective conductors shall be installed in the trunking.

Joints in the lid and trunking must not be allowed to coincide.

All conduit entries shall be made by means of purpose made bushes and couplings or
adapters.

2.9.3 Plastic Conduit

2.9.3.1 Fittings

Conduits and conduit fittings/accessories shall comply with BS 4607 and BS 6099 Section
2.2 and be of a super high impact heavy gauge type of one colour only throughout the
system.

Conduits less than 20mm diameter shall not be used.

Manufactured type elbows and bends shall not be used.
All conduit boxes used to support equipment shall be provided with steel claw thread

inserts, which shall take the weight of the equipment. Where the weight of the
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equipment exceeds 3kg or the temperature of the equipment exceeds 60 C a metal box
shall be provided.
All conduit accessory boxes shall be provided wit h an earth terminal.

Termination at accessories shall be made into steel boxes as manufactured to BS 4662 :
1970 (with amendments) or BS 5733 : 1995 (with amendments).

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