Specifications

Design Guidelines & Procedures Version 18 ©
Electrical Services Section 20.00 / Page 13
Non-fading laminated prints of the ‘As Constructed’ line diagram schematic drawings of the main
switchboard and the building electrical reticulation shall be installed on a wall within the Main
Switchroom, outgoing cables and the rating, model and manufacture of all switchgear mounted in
the switchboard.
The electricity supply authority meter shall be mounted either on or adjacent to the MSB, and
these meters shall be capable of measuring the electricity peak and off-peak consumption.
20.08.02 Distribution Boards
Distribution Boards shall be type tested (Form 2 Type 1) construction, arranged for wall mounting
unless circumstances dictate otherwise.
Provide 100% spare capacity on all distribution boards in Science type buildings and 75% spare
capacity in ‘non-science’ type Academic buildings. Non-Academic buildings shall have 50%
spare capacity.
Distribution boards shall be provided within areas of heavy load concentration and within each
laboratory.
All light and power circuits are to be loaded to less than 75% of their rated capacity.
All distribution boards to be made large enough to cater for all incoming mains and outgoing
cables and the positioning of Transformers, Terminal Blocks and Contactors so that cable to
these items can be done in a neat and tidy manner.
All cables feeding Circuit Breakers to be via ducting complete with spare capacity and easily
removed lids.
Busbars shall be extended into the spare space and circuit breakers (1 off 20ASP and 1 off
20ASP RCD) shall be fitted to the spare space. Sub-mains shall be sized for the appropriate
spare capacity.
20.08.03 Board Design, Access & Colour
All switchboards, distribution boards and control panels shall be designed to be vermin proof.
There shall be physical barriers between each 240 volt section of the board, and each section
shall be fitted with a hinged lockable door. Locks shall be quarter turn slotted locks with
escutcheon and L&F 92268 keys. All doors shall be keyed alike.
External switchboards shall be at least IP65 of type tested (Form 4 Type 7) construction
fabricated from 3mm thick marine grade aluminium sheet, complete with a pad lockable ‘L’
shaped handle, and shall have spare capacity for future load as determined by OFM .
All switchboards shall be colour ‘Orange X15’ (AS 2700) externally and White internally.
Emergency services sections shall be colour ‘Red R13’ external and White internally.
20.08.04 Fuse Cartridges
All fuses shall be HRC cartridge type conforming to AS 60269 and AS 3135. Fuse carriers shall
be fully shrouded type.
A minimum of three (3) spare cartridges for each rating shall be supplied at each switchboard
and fused tee-off position mounted on a suitable rack.
At the main switchboard position, fuses shall be located in a wall mounted moisture proof
enclosure in the switch room.
At distribution boards and fused tee-offs, the fuses shall be mounted in a convenient location in
the respective cupboards.
20.08.05 Polyphase Kilowatt-hours Meters
Polyphase kilowatt-hours meters with a pulsed kWhrs output to the CCMS shall be provided on
each main switchboard to register the total building consumption and separate consumption for