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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E38 of 52 Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits 17.2 Impedance Bond Lug Plates In the case of the Style P3 impedance bond, the busbar is not secured directly to the impedance bond lug plate as with all other impedance bond types. A separate lug plate (Railway Catalogue No. 88/27761) is required, as shown in Figure E44. This is secured to the impedance bond lugs with four 1¼” x 3 /8” hexagon headed BSW bolts, plain spring washers and nuts, which are provided with the impedance bond. 17.3 Packing Pieces The arrangement of packing pieces required between busbar and sleeper is shown in Figure E29. The packing pieces are illustrated in Figure E45. They are not attached to the sleepers but secured to the busbar using No.10 x 1¼” wood screws. 17.4 Busbar Restrictor The busbar is maintained in position by a busbar restrictor arrangement. This comprises a pair of side stops (Railway Catalogue No 88/27760) as shown in Figure E46. The side stops incorporate a steel rod assembly to prevent excessive vertical movement. Installation of the busbar restrictor is shown in Figure E43. 17.5 Impedance Bond Connection Arrangements Figure E37 shows the various connection arrangements to be applied to Type 3 impedance bonds installed in new works. Connections for maintenance replacement of other types of impedance bond are shown in Figure 38. E 38 R A I L T R A C K
<strong>General</strong> <strong>Information</strong> on Track Circuits Notes * Intertrack Cables A * IRJ Intertrack CablesB 2 For details of all busbars see Figure E39. Item 1 DOUBLE RAIL TRACK CIRCUIT TO NO TRACK CIRCUITED LINES T.P. Huts Neg Return B Item 3 IRJ Double Rail Track Circuit to Double Rail Track Circuit Substations 4 Traction Return cable sizes : A = 240mm2 Aluminium B = 800mm2 Aluminium 5 Where TI.21 Track Circuits rail bonds require to share the first sleeper bay with the traction return cable, they must be taped to the traction return cable. Orange pipe must not be used IRJ IRJ T.P Hut Neg Return A Neg Reinforcing CableB * IRJ Intertrack Cables A Item 5 IRJ Double Rail Track Circuit to Single Rail Track Circuits T.P. Huts Or Cross Bonding Sites. 1 All lugs complete with bolts, nuts and washers for negative cross bonding substations and T.P. hut cable attached to busbar to be supplied and fitted by Electric Traction Engineer. 3 For full details of layouts see Figure E26, Figure E27, Figure E28. 6 The Electric Traction Engineers lugs to be attached to the top of the busbar (Figure E55 for marking jig). 7 Impedance bonds at substations and T.P. Huts to be sited in co-operation with the Electric Traction Engineer. 8 In all layouts a longer busbar may be provided where necessary to accommodate reinforcing cables. * Cross track orange plastic pipe for protection of signalling cables. * Withdrawn Document Uncontrolled When Printed * * Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E39 of 52 * * Intertrack Cables A Substation Neg ReturnB * IRJ Intertrack Cables B R A I L T R A C K E 39 Item 4 IRJ Double Rail Track Circuit to Single Rail Track Circuits Substations N.B. This Arrangement is Also Used at Sites Other Than Substations IRJ IRJ Item 2 Double Rail Track Circuit to Double Rail Track Circuit Substation Neg Returns Intertrack Cables B Item 6 Double Rail Track Circuit Intermediate Bond At Substation T.P. Huts or Cross Bonding Sites B * * Neg Reinforcing Cable See Note 9 B T.P. Hut B Neg Return Intertrack CablesA Item 7 Double Rail Track Circuit Intermediate Bond T.P. Huts Or Cross Bonding Sites
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