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 D18 of 20 Notes on Figure D13: <strong>General</strong> <strong>Information</strong> on Track Circuits Figure D13 gives examples of the application criteria for IRJs, the references being as follows: 13.15 RJ Summary C Clearance for vehicle overhang. Not less than 4880mm from the fouling point to the IRJ. D Distance between inner joints of staggered pairs. E Distance between staggered pair and end of track circuit. Withdrawn Document Uncontrolled When Printed Not less than 11m if both of pairs staggered < 1.6m. Otherwise, not less than 18.3m. 18.3m minimum. F Fouling point. 1970mm between running edges L Minimum effective length of track circuit. 18.3m minimum S Physical Stagger 1.7m max: Isle of Wight lines only. 2.1m max: Signal rail overlap on electrified lines. 2.6 max: Other cases. Figure D13 D18 RAILTRACK
<strong>General</strong> <strong>Information</strong> on Track Circuits 14 Track Circuit Equipment Positioning 15 Layout and Wiring of Lineside Apparatus Housing Equipment Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page D19 of 20 13.16 Permanent Way Engineering Considerations The following should be considered relative to IRJ provision in S & C as constrained by permanent way engineering considerations: • IRJs adjacent to cast crossings should be avoided wherever possible. • IRJs run over in the high speed route should be avoided as far as possible. • There should be a minimum distance of 200mm between chair or rail fastenings of opposite polarity/phase to reduce the probability of failures due to metallic litter, etc. With a view to obtaining the best possible performance, track circuit equipment should be positioned as close as practicably possible to the associated rail connections, and any maximum limits laid down in the individual track circuit sections must not be exceeded. This also permits better communication between technicians when working apart, undertaking drop shunt tests, etc. In tunnels and on viaducts, the feed and relay ends of a track circuit should be mounted in the same lineside apparatus housing, provided that no electrical parameters are infringed. If the design of track circuit is such that staff are not required to make adjustments (eg. HVI track circuits), the relay or receiver equipment may be grouped in equipment buildings provided that no electrical parameters are thereby infringed. Disconnection boxes may be provided if site conditions warrant. These must be shown on wiring diagrams, but are not required on bonding plans unless they contain fuses or arresters. All relays should be mounted as near to the top of the lineside apparatus housing as possible. Tail cables are to be terminated at the bottom of the lineside apparatus housing in one of the following manners, as appropriate: • Directly onto the track fuse and link. • Directly onto the track fuses. • Directly onto two links. • Directly onto a surge arrestor. In d.c. traction areas where the lineside apparatus housing is remote from the track connections, the surge arrester (where provided) and track fuse must be located at the tail cable terminations nearest to the rail connections. Where special restrictions apply to wiring and/or positioning of equipment, this must be clearly shown on all wiring/layout drawings, so that if any alterations are made at a later date, the restrictions are readily apparent RAILTRACK D19
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