General Information on Track Circuits - RGS Online

<strong>General</strong> <strong>Information</strong> on Track Circuits
10 Arrangement of
Track Lead Rail
Connections
(Except Jointless)
A
B
Dis
Box
C
D
Withdrawn Document
Uncontrolled When Printed
Railway Group Approved Code of Practice
GK/RC0752
Issue Two
Date December 1998
Page E19 of 52
Figure E15 and Figure E16 show typical arrangements of rail connections
either side of an insulated joint. Figure E15 uses 90mm diameter orange pipe
and is the preferred arrangement, except where the pipe is unable to be
threaded under the rail, (eg. tunnels and other areas of restricted use). Figure
E16 shows the alternative method where the cables are clipped to the top of the
sleepers.
In both cases, duplicated single core 2.5mm²(f) flexible cable, fitted with moulded
rubber connectors, is the preferred arrangement to be used between the
disconnection box and the rail. It is terminated on the four foot side of the rail.
Under no circumstances should the track leads of different track circuits share a
common rail connection.
Note Combining two track circuits into one 4 core cable is not permitted.
If required, in order to avoid vandalism, the disconnection box can be replaced
by a heat–shrink jointing kit.
Track lead arrangements for jointless track circuits are described in the relevant
section dealing with the particular design.
IRJ
Traction Return Bond
w Y
R A I L T R A C K E 19
IRJ
On non-electrified lines the first bay
to be left clear
Cable Route
X
Dis
Box
Note Dis Boxes should be mounted in a permanent Green Zone as defined in
GO/RT3073.
Figure E15
Z