General Information on Track Circuits - RGS Online

<strong>General</strong> <strong>Information</strong> on Track Circuits
9 Track Circuit
Disconnection
Box
Withdrawn Document
Uncontrolled When Printed
Railway Group Approved Code of Practice
GK/RC0752
Issue Two
Date December 1998
Page E17 of 52
Move the heat–shrink sleeve until the entire stripped length of the cable is
covered by the sleeve without restricting the securing hole.
Apply heat to the heat–shrink sleeve. Before heating, the sleeve is 55mm long,
and reduces to about 50mm when it is fully heat–shrunk onto the cable and the
plate.
Place the “L” plate assembly onto the threaded studs and secure using the
remaining washers and the self locking nuts, tightened to a torque of 13 Nm.
Fit the flange clip over the cable and push the clip onto the rail.
The typical arrangement of the track circuit disconnection box is shown in Figure
E13. It is mounted on a stake using two M8 studs (supplied with the box) and
comprises a moulded rubber back with a slide–on metal cover which can be
padlocked using the standard RKB221 padlock. Provision is made to securely
clamp both the lineside apparatus housing tail cables and track lead cables in the
base of the box. A longer stake is available for use where ground conditions are
poor.
Description
Stake (Angle), 760mm long, to BRS-SM 104/13 :
Catalogue No.
86/10751
Stake (Angle), 1070mm long to BRS-SM 104/11 : 86/88250
Track Circuit Disconnection Box : 86/43877
The termination for each track circuit comprises a four way 2BA link block. The
various cables should be terminated as shown in Figure E14 (this enables the
individual track leads of duplicated arrangements to be disconnected/tested
separately).
Note 1: Only one track circuit is allowed in a Disconnection Box and hence
double track circuit boxes are not to be used.
Note 2: Separate tail cables must be provided for each track circuit end.
Note 3: Disconnection Boxes should be mounted in a permanent Green Zone
as defined in GO/RT3073.
R A I L T R A C K E 17