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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E20 of 52 A C B D Dis Box Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits IRJ Traction Return Bond IRJ On non-electrified lines the first bay to be left clear Cable Route E 20 R A I L T R A C K W X Dis Box Note Dis Boxes should be mounted in a permanent Green Zone as defined in GO/RT3073. Figure E16 Description Catalogue No. Pipe, Medium Density, Orange, 6 metres x 90mm : 86/44141 Clip, Pipe for 90mm o/d pipe : 86/44140 Fastaway Clip, 6.5mm for 2.5mm²(f) cable : 86/43489 Moulded Flexible TC Lead 2.5mm²(f): 3.0 metre : 86/44022 4.5 metre : 86/44023 6.5 metre : 86/44024 8.0 metre : 86/44025 30.0 metre : 86/44026 Disconnection Box for Track Circuit : 86/43877 Stake for Disconnection Box 760mm Long : 86/10751 Stake for Disconnection Box 1070mm Long : 86/10751 Cable Joint Kit, 1 x 2.5mm²(f) single to 1 x 2.5mm² single : 54/15875 Cable Joint Kit, 2 x 2.5mm²(f) single to 1 x 2.5mm² two core : 54/15873 Cable Joint Kit, 2 x 2.5mm²(f) single to 1 x 2.5mm² single : 54/36101 Cable Joint Kit, 4 x 2.5mm²(f) single to 1 x 2.5mm² two core : 54/36102 Y Z
<strong>General</strong> <strong>Information</strong> on Track Circuits 11 Fishplate Bonding Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E21 of 52 The method and components described in this section are to be used to improve the reliability of the electrical connection between pieces of rail which are already in casual electrical contact by virtue of their construction. Whilst the most obvious item in this category is the non–insulated fishplate type rail joint on all non–electrified and a.c. electrified lines, this method of bonding extends to elements of S & C, such as crossings, wing rails etc, where the components are also bolted together without intervening insulation. On d.c. or dual a.c./d.c. electrified lines, it is to be used on the signal rail only of single rail track circuits. Bonding of fishplates in the traction return rail of d.c. electrified railways is the responsibility of the Electric Traction Engineer. 11.1 Standard Fishplate Arrangement Two 7.2mm holes, 76mm apart, are drilled through the rail web in the first sleeper bay each side of the joint. The holes should be 57 ±2mm above the base of the rail. The bonds should generally be fitted on the four foot side of the rail using channel pins and run close to the base of the rail, as shown in Figure E17. The short exposed end of the bond should be folded flat and hammered against the rail. Bonds should not be threaded through the fishplates or rail fastenings. In areas prone to vandalism the bonds may be passed under the rail so that they are less vulnerable; when this is done one end of each bond is attached to the inside of the rail and the other end to the outside. However, bonds should not be passed to the outside of the rail if there is a conductor rail on that side. Catalogue numbers are as follows: Description Catalogue No. Bond, solid steel, galvanised, 4.29mm x 1670mm : 86/44149 Channel Pin to BRS-SE33 : 86/44012 A Figure E17 76 B 535 57 ± 2mm R A I L T R A C K E 21 535 A 76 B Running Edge Channel Pin 7.2mm DIA. Hole Bond
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