General Information on Track Circuits - RGS Online

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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E22 of 52 Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits 11.2 Standard S&C Arrangements 11.2.1 Switch/Stock Rail Figure E18 Switch Rail Stock Rail 11.2.2 Acute Fabricated Crossing E 22 R A I L T R A C K * * Parallel Wing Extension Figure E19 If a parallel wing is fitted, holes marked * should have bond leads fitted prior to assembly of vee and before the parallel wing is attached. The leads should be tied along the rail to prevent damage in transit. 11.2.3 Obtuse Fabricated Crossing Figure E20
<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 on Track Circuits 12 Jumper Bonding Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E23 of 52 11.3 Fishplates in Concrete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
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