Specifications

Design Guidelines & Procedures Version 18 ©
Electrical Services Section 20.00 / Page 15
An A1 size non-fading laminated single line circuit diagram shall be provided for each DB and
shall be hung on the internal face of the board door using an eye lid mechanism.
20.08.08 Circuit Breakers
Circuit breakers to final sub-circuits shall be ‘Clipsal 4 Series Power Range’ or ‘Merlin Gerin DIN
Range’ miniature circuit breakers or better, subject to approval.
‘Eaton Quicklag’ circuit breakers shall be installed in existing electrical distribution boards where
necessary subject to approval by the CLF Electrical Engineer.
Residual Current Device (RCD) protection shall be provided to all power sub-circuits supplying
light fittings and power socket outlets, unless otherwise stated. Each circuit shall be individually
protected. Where power outlets are not RCD protected, they shall be round pin socket outlets
and prominently labelled ‘OUTLET NOT RCD PROTECTED’.
The number of circuit breakers required shall be limited by ensuring that a minimum of five (5)
single occupancy staff offices/workstations shall be supplied from a single power circuit except
where specialised equipment may be present in which case the circuit shall be designed to suit
the electrical load.
If a refurbishment project results in more than 35% of the circuits on an existing switchboard
being replaced or modified, then all lighting and power circuits on that switchboard shall be fitted
with RCDs if they are not currently installed as required by AS 2000-2007.
20.08.09 Cable Numbering
All neutrals, earths and active cables shall be number ferruled to correspond to the circuit
breaker number.
All circuit breakers shall be numbered consecutively on the fascia from top to bottom on the left
hand side then top to bottom on the right hand side, and also on the circuit breaker mounting
bracket for ease of identification once the fascia has been removed.
All active cables entering circuit breakers shall be installed as per manufacture’s
recommendations.
All control wiring shall be number ferruled with numbers as indicated on as constructed drawings.
Neutral and earth bars shall have the same number of terminations as there are circuit breaker
positions and be provided with two grub screws per terminal. Multi-joining of earths and neutrals
into one joint prior to termination shall not be acceptable unless they are screened cable
earthing. Screw type cable connections shall not be permitted within switchboards and
distribution boards.
20.08.10 Standard Equipment
Standard equipment for all switchboards and distribution boards for light, power, air-conditioning
or other building services shall be as follows;
 Alarm Relays ‘Releco MR-C 11’ pin base.
 Auto/Off/Manual Switches ‘Kraus and Naimer CG4’.
 Push buttons Shrouded push button type (NHP D5) with LED indicator.
 Indicating lights LED (multiple.)
 Contactors ‘Sprecher and Schuh’.
20.08.11 Electrical Tee-off Boxes
Where electrical tee-off boxes are used, they shall be accessible, painted ‘Orange X15’ and
labelled on the front to indicate the switchboard served by the box, origin of supply.
If a fused tee-off box is used, the fuses shall be labelled and the front panel shall be complete
with a legend stating which switchboard is serviced by the fuses and the fuse ratings.