VRIOGS 012.2.1 - Public Transport Victoria

28 VRIOGS 012.2.1 REVISION A
e) Where troughing is to enter a pit, the pit shall be installed flush with ground level.
Where the final ground level is not certain at the time of pit installation, the Constructor
shall ensure before the conclusion of the works, that no pits are left protruding above
the ground by either re installation or the use of “A” grade 20 mm crushed rock etc.
8.8 Above Ground Troughing Cable Entry/Exit to Trackside Equipment
a) The cable entry/exit shall be fitted with grommets or use conduit or conduit glands to
protect the cable insulation from being damaged by sharp edges.
b) Steel couplings shall be used when:
i. Cable enters/exits the side of the steel troughing.
ii.
iii.
Cable enters/exits the bottom of the extended chamber.
Cable enters/exits the bottom of the steel troughing.
c) Entry and exit points shall be permanently sealed to prevent the entry of water or
rodents
8.9 Cabling Through High Voltage Areas
a) At no time shall entry be made into "HIGH VOLTAGE" areas adjacent to or inside
substations, tie stations or switchyards unless previously arranged and
accompanied by the Infrastructure Manager or their Representative.
b) An earth mat is provided around high voltage locations as part of the earth
protection arrangements for the high voltage installations. All signalling and
communication cables that are installed through or near an earth mat shall be
protected in PVC conduits or ground level troughing.
c) Where copper communication cables are required to be run into high voltage
earthed locations such as substations, power sectioning huts and high voltage
transformer locations, the cable shall take the shortest route, through the earth mat.
d) Cable joints shall not be installed within the Earth Potential Rise (EPR) area.
8.10 Arrangements at or near Overhead Wiring Structures
a) Steel troughing shall not be installed within 2 metres of the overhead traction wiring.
b) Where the Infrastructure Manager has approved that metallic troughing or ladder is
acceptable to pass within 2 metres of any overhead traction wiring structure, it shall
be fitted with an insulated joint at least 2 metres distant from each side of the
overhead traction wiring structure.
c) GST and its mounting brackets shall not be fixed to or installed within 75 mm of any
part of an overhead traction wiring structure.
8.11 Troughing Route Capacity
a) One or more troughs shall be installed to provide the necessary capacity to
accommodate all the main and local signalling, and low voltage power cables in the
cable route plus an allowance of not less than 25% spare capacity shall be provided
for future requirements.
b) Additional and separate troughs shall be provided for :-
i. High voltage power cables
ii.
Communications cable
c) Steel air lines shall not be installed in GST. However, flexible PVC air lines up to 25
mm bore may be installed on top of signalling cables in GST.
NOTE: This document is controlled only when viewed on the DOT Engineering Standards website.
Any other copy of this document is uncontrolled, and the content may be inaccurate.