Specifications
Design Guidelines & Procedures Version 18 ©
Electrical Services Section 20.00 / Page 16
20.08.12 Workshop Drawings
Detailed construction drawings of the proposed switchboards shall be submitted to OFM for
approval prior to construction. They shall be drawn to a minimum scale of 1:20 and shall show
plan, front elevation, rear elevation in the cases of rear access switchboards, sectional views
through plan and elevation sections showing each variation of cubicle layout, segregation and
bus-bar arrangements.
Drawings shall also include schedules of all equipment, with manufacturer and model nominated,
and a line diagram reflecting the actual configuration of the busbars, nominating size and rating
of each section.
20.09 Electrical Riser Cupboard
The electrical riser cupboard as described in Section 2.00 Planning & Design Controls, shall
have lighting and a double 10A switched socket outlet at each floor level.
20.10 General Wiring
20.10.01 Cable Types & Sizes
Power and lighting cable shall not be less than 2.5mm
²
, stranded copper conductors.
Colour coding shall be in accordance with AS 3000. Control wiring shall be white, or brown.
Field control wiring for extra low voltage (less than 32 V a.c./110 V d.c.) shall be not less than
1.5mm
²
stranded copper. Control wiring within switch board can be 1.5mm² but once these
control cables leave the board they are to be 2.5mm² and leave via a terminal block.
Subcircuit cabling shall be installed using the ‘loop in – loop out’ principle.
Junction boxes, with identification labels shall only be used after written approval from the
Superintendent.
20.10.02 Cable Entries
Cable Entries to switchboards or equipment via gland plates or through panels shall be made
using circular, orange-sheathed, cable and suitable compression glands. Double insulated flat
cable may be used if entering through ducts or conduits. Non-magnetic gland plates and
penetration cover plates shall be used when the cable rating exceeds 100 amps.
20.10.03 Cable Trays, Ladders & Conduits
Cable trays, ladders, conduits and conduit saddles shall have the following colour coding
throughout the entire installation;
Orange X15 - for power, lighting and 240V controls.
Grey - for extra low voltage or low voltage controls.
White - for telecommunication and data services.
Signal Red R13 - for fire services.
Where cable ladders, conduits and conduit saddles are in public areas, they should be painted to
match background colouring.
Conduit saddles shall be of the stand-off type i.e. full saddle with spacer in exposed areas or on
painted walls. Half saddles are not acceptable.
Cable trays, ladders and ducts shall be fully galvanised and colour banded (400mm) every 3
metres minimum, at each change of direction and either side of any partition or barrier they may
pass through.