Design Guidelines & Procedures Version 18 ©
Electrical Services Section 20.00 / Page 20
20.13 Lightning Protection
Lightning protection shall be provided to all buildings if recommended using the risk assessment
criteria specified by AS 1768. Test points shall be provided at the lowest level of the building.
Transient overvoltage protectors shall be provided on all power cables entering or leaving the
building to protect equipment connected to the building’s power distribution system, and
nominated distribution boards, against transient overvoltages coming into the building from
outside. Transient overvoltage on the site and building MSBs shall be monitored by the CCMS.
Protectors must not interfere with or restrict normal operations. They shall not corrupt the normal
mains power supply, break or shutdown the power supply during operation or have an excessive
earth leakage current. Protectors shall be connected via high energy fuses to facilitate ease of
replacement.
The protectors shall be rated for a peak discharge current of no less than 10kA (8/20 s
waveform). The peak let through voltage shall not exceed 600V for protectors with a nominal
working voltage of 230 or 240 volts. This peak transient let-through voltage shall not be
exceeded for all combinations of conductors (phase to neutral, phase to earth or neutral to
earth).
A protector shall have continuous indication of its protection status, indicating the following;
full protection present,
reduced protection – replacement required,
no protection – failure of protector.
Status indication shall warn of protection failure between all combinations of conductors,
including neutral to earth.
20.14 Clocks
20.14.01 Clocks Generally
Clocks are to be installed in all spaces which are accessible by students, including the foyers and
corridors of buildings whose primary function is teaching and learning.
The provision of clocks in buildings whose primary function is research or administration shall be
limited to the main building foyer, lift lobbies and special spaces such as video conferencing
rooms. The number of clocks in such buildings shall be determined by CLF.
Clocks shall generally be installed in the following locations;
lecture theatres (side wall),
seminar rooms (side wall),
other teaching spaces (side wall),
teaching laboratories,
student common rooms,
open access computer work areas
main foyers,
lift lobbies
corridors (at 25m max. centres)
20.14.02 Clocks in Existing Buildings
A Master Clock system exists on each GU campus. Any additional clocks installed as part of an
alteration or refurbishment shall be connected to the system under the Contract.
The existing Master Clock system for each campus is as follows;
Nathan - Simplex Model 6400 situated in the Main Switchroom on Level 0 of the N25 Science 1
Building.
(130 pages)
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