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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E16 of 52 Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Flange clips may also be obtained for larger cable sizes: Description Catalogue No. Flange clip, 15mm, BRS–SM 849 (2) : 86/43498 Aster and TI21 Track Circuits Flange clip, 23mm, BRS–SM 849 (3) : 86/43499 Inductive Loop Reed Track Circuits Cable Termination Label TCABRB (1) Flange Clip `L' Plate Stainless Steel Washer & Locking Nut Heat Shrink Sleeve Stainless Steel Washer & Nut E 16 R A I L T R A C K 76mm Two Holes 7.2 Dia. 57 + 2mm Figure E12 The rail should have previously been fitted with two threaded studs by one of the methods described in 8.2 to 8.4. Fit a washer and nut to each threaded stud and tighten to a torque of 13 Nm. Strip back 20mm of the outer sheath of the 2.5mm²(f) cable, followed by 8 - 9mm of the inner sheath to expose the conductor. Slide the crimp terminal onto the cable and crimp it. Ensure that the crimping tool is the correct size, and matches the crimp terminal being used. The kit currently contains an AMP PIDG 6mm terminal, for which a yellow/black handled AMP tool (59239-4) must be used. Slide the heat–shrink sleeve onto the “L” plate and thread the cable through the sleeve until the eye of the crimp is over the end hole of the ‘‘L’’ plate.
<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 on Track Circuits 9 Track Circuit Disconnection Box Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E17 of 52 Move the heat–shrink sleeve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
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