VRIOGS 012.2.1 - Public Transport Victoria

16 VRIOGS 012.2.1 REVISION A
w) Where conduits are utilised for the extent of a main cable route; cable pits are to be
installed at no greater than 300 metres apart and nominally 150 metres, and be
capable of allowing a person to enter the actual pit. Conduit quantities and sizes
within the main cable route are to comply with those within this Standard.
x) Where conduits are to be provided for entry into signal equipment rooms, signal
equipment huts and as related to this specification; there shall be a cable pit
installed outside that building for entry to within that building. This cable pit shall
cater for all conduits required for the works, for future capacity and all other cabling
and conduits requirements within this specification.
y) Spigot type or bell mouth fittings shall be used on all conduits; during cable
installations to ensure that cabling is not damaged during installations.
z) All conduits, used or not, shall be appropriately sealed to prevent water and rodent
entry into the pit/s.
6.8 Capping of conduits
a) All spare conduits shall be capped after installation using UPVC caps, or equivalent
to prevent the possibility of stray materials entering the conduits.
6.9 Method of joining conduits
a) All conduit joints shall be by utilising the spigot and socket ends.
b) The ends to be joined shall be thoroughly cleaned using a conduit manufacturer
approved solvent. The ends, both spigots and socket shall be coated with a conduit
manufacturer approved adhesive and the joint then completed
6.10 Direction of laying conduits
a) The orientation of the spigot and socket ends of the conduit forming the pits is
critical in providing for smooth and safe cable pulling and installation works
b) Where cables are to be pulled into relay rooms and other similar enclosures, all
spigot ends must face these enclosures.
6.11 Draw wires in conduits
a) Spare conduits shall be cleaned, fitted with a draw wire of 6mm polypropylene
blue/yellow rope or similar approved draw wire.
b) The draw wire shall be continuous for the complete length of the conduit run
c) The draw wire shall have a minim of 2 metres of slack within each and every pit
along the conduit run, and shall be suitably anchored at each end of the conduit run
and then sealed with proprietary end caps to prevent the ingress of dirt, etc.
d) The draw wire shall be restrained in each pit to prevent it being inadvertently pulled
into the conduit/s.
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.