Specifications

Design Guidelines & Procedures Version 18 ©
Electrical Services Section 20.00 / Page 12
In cases where a UPS is required, the wiring of the load centre shall allow continuous power
supply to the TER via a bypass switch when the UPS is undergoing maintenance.
Lighting circuits within the TER shall be fed from a distribution board outside of the TER.
The room shall also have one (1) dual outlet GPO mounted 800mm above f.f.l., on a separate
circuit to that used for the equipment racks. This GPO shall have a red rocker switch and face
plate, and labelled ‘Telecommunication Equipment Only’.
The design of the electrical wiring within the TER shall be carried out in close consultation with
ICTS and CLF.
All racks and cable trays shall be earthed as per Section 4.5 of the Telecommunication Standard
HB29 2007.
20.07.13 External GPOs
Provide one (1) weather protected dual outlet 10A GPO on a dedicated 20A circuit mounted
1000mm min. above f.g.l. (to underside of face plate) on at least two (2) exterior walls of the
building for outdoor activities unless advised otherwise by CLF.
The location of the GPOs shall be determined by the Superintendent.
20.07.14 Printing Stations
Printers and printer/photocopiers shall not be fed from the same circuit as any sensitive
equipment (see Clause 20.07.11 of this Section).
20.07.15 Residual Current Device (RCD) Test Point
A RCD test point shall be provided at the end of all electrical circuits protected by a RCD.
For lighting circuits, the last light fitting on the circuit shall be serviced via a suspended double
power outlet in the ceiling space with the spare outlet to use for testing. A ‘Traffollyte’ label shall
be fixed on the ceiling grid adjacent to the fitting, or on the fitting flange in flush plasterboard
ceilings, for easy identification and locating of the test outlet. Where there is no false ceiling, the
double outlet shall be surface mounted and similarly identified.
For power circuits, the last GPO on the circuit shall be labelled.
The labels shall read ‘RCD Test Point’ and shall also note the circuit identification number.
All test points shall be shown on the ‘As Constructed’ drawings, and an A3 size laminated
drawing showing the test points shall provided at each distribution board.
20.08 Switchboards & Sub-boards
20.08.01 Main Switchboard
The main switchboard shall be of type tested (Form 4 Type 2 generally) construction, floor
mounted, free standing compartmented cubicle type construction. Provision shall be made to
extend the main busbar systems in either direction.
At least 25% spare space complete with busbars shall be provided as an absolute minimum,
spare spaces shall be distributed across each section of the switchboard and each section shall
contain at least one off spare space.
No equipment is to be mounted less than 300mm above the floor.
The IP rating for all boards shall be suitable for the location of the switchboard and agreed with
OFM prior to tender.