VRIOGS 012.2.1 - Public Transport Victoria

14 VRIOGS 012.2.1 REVISION A
6.6 Cable and Conduit Ploughing
a) Cable and Conduit Ploughing shall only be utilised for signalling and
communications installation works with approval from the Infrastructure Manager.
6.7 Buried Conduits
a) Conduits shall be rigid UPVC or other Infrastructure Manager approved product
types and all joints performed using the manufacturer's recommended jointing
methods.
b) The wall thickness (or class) of conduit shall be sufficient to guarantee that there will
be no loss of cross sectional area and that there will be less than 10% loss of
diameter in any direction during or after backfilling, boring, ploughing or pulling.
c) The minimum diameter of conduits shall be at least three (3) times the outside
diameter of the cable to be pulled through the conduit with a minimum of 50 mm
diameter.
d) The number of conduits to be provided in ULX's, URX's and under access roads will
depend on the cable route requirements in that area but provision shall be made for
the following, as applicable.
e) Signalling and power cables shall be in separate conduits to communication cables.
f) High voltage cable shall be in a separate conduit to signalling or communications
cable.
g) Each 1 kv, 2 kv, 6.6 kv or other high voltage cable shall be in a separate conduit,
with separation distances in accordance with Australian Standard AS3000 and
VicTrack Cable Installation Specification TS-SP-013.
h) Unless otherwise approved, fibre optical cable shall be in a separate conduit.
i) Air lines shall be in a separate conduit.
j) Except for directionally bored ULX’s and URX’s; conduits shall be laid parallel and
level in a consistent format in the trench and secured in that position, then carefully
compacted with clean fill to hold them in their desired position.
k) The minimum cover to the upper most section of the conduits shall be as follows:
i. Station platforms, non vehicular areas: 300 mm.
ii.
iii.
iv.
Pedestrian access ways: 450 mm (ACMA requirement)
Heavy vehicular areas: 650 mm.
Rail reserve and station areas: 650 mm
v. Access roads where conduits are less than 650 mm below surface level, the
final 150 mm of fill shall be concrete (25Mpa).
l) Rigid UPVC conduits used for protection of cables shall be white for communication
cable and white with a continuous black marking line for air mains. Orange conduits
shall be used for other cabling.
m) A draw wire of 6 mm polypropylene blue/yellow or similar rope shall be placed in
each conduit and suitably anchored at each end. Conduit ends shall be sealed using
conduit end caps or an approved equivalent to prevent the ingress of dirt or sludge
into the conduits.
n) All cables installed under rail lines shall be enclosed in conduits. The requirements
for installing conduits and pipes under tracks are further specified in AS4799
“Installation of underground utility services and pipe lines within railway areas”. The
preferred installation is by boring or jacking of conduits under tracks.
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Any other copy of this document is uncontrolled, and the content may be inaccurate.