General Information on Track Circuits - RGS Online

<strong>General</strong> <strong>Information</strong> on Track Circuits
12 Jumper Bonding
Withdrawn Document
Uncontrolled When Printed
Railway Group Approved Code of Practice
GK/RC0752
Issue Two
Date December 1998
Page E23 of 52
11.3 Fishplates in Concrete Bearer Pointwork
Rail to rail fishplate bonding in concrete bearer S & C should be achieved using
the same techniques as specified for Standard Jumper Bonding.
11.4 Redundant Insulated Rail Joints
Where redundant insulated rail joints cannot be avoided:
a) In d.c. traction areas, the Electric Traction Engineer should be requested to
install all temporary bonds across IRJs which will carry Traction Return
Current. If the bond is to carry track circuit currents only, Galvanised Iron
(GI) bonds may be used and be fitted by the Signal Engineer.
b) In a.c. traction areas, if either side of an IRJ is a traction return rail, the
Electric Traction Engineer should install the temporary bond, but if both sides
of the IRJ are signal rails then standard fishplate bonds may be used as a
temporary measure.
c) In non–electric traction areas, ordinary bonds should be used.
This section describes the components and installation of jumper bonds
designed to carry track circuit currents only. Apart from special cases of
impedance bonds, traction jumpers are the responsibility of the Electric Traction
Engineer. Refer to Section 2.
12.1 Standard Jumper Bonding
This arrangement should be used on non–electrified lines and on the signal rail
only of d.c. or dual a.c./d.c. electrified lines. It should not be used for yellow
bonding purposes.
Standard jumper bonding uses the same single core cable as used for track
terminations (GS/ES 0872 Type C1 2.5mm²(f)) terminated in the rail web, using
either the “L” Plate connector or preformed moulded rubber connector.
For cable lengths and catalogue numbers see 10.
12.2 Yellow Standard Bonding
Yellow standard bonding uses GS/ES 0872, 35mm² cable, identified with a
yellow sheath or a yellow sleeve at the termination. The bonds are supplied in
various lengths with a moulded rubber connector for connection to the rail at one
end and unterminated at the other. Yellow bonds should not be installed more
than 20m apart.
Catalogue numbers are as follows:
Description Catalogue No.
Moulded Flexible TC Lead 35mm² :
3.0 metre : 86/44155
4.5 metre : 86/44154
6.5 metre : 86/44153
8.0 metre : 86/44152
30.0 metre : 86/44151
Jointing Kit For Moulded Flexible TC
Lead 35mm² : 54/037092
R A I L T R A C K E 23