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Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E50 of 52 Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits All contact surfaces should be coated with a uniform layer of jointing paste (Catalogue No. 7/26200) immediately after cleaning and any surplus cleaned away after tightening. The paste prevents moisture filling the resultant air spaces between the dissimilar metal surfaces, preventing corrosion which occurs very rapidly, particularly when aluminium is exposed to air or moisture. Where screw and nut connections are made to aluminium plate, eg. the aluminium busbar or P3 impedance bond lug plate, it is essential that mechanical connections are not over-tightened. This is because aluminium displays the property known as ‘‘cold flow” under pressure and if a certain pressure is exceeded, a flow away from the pressure area occurs and the connection becomes loose, resulting in a high resistance connection. Details of side lead/busbar connections and torque values are shown in the tables in Figure E52 and Figure E53. Where possible, the side lead connections should be tested, using a millivolt meter in accordance with GK/RC0754 Part G. Figure E52 Type of Impedance Bond Type Of Connection Busbar(Item) Side lead (Item) Type 3 D E MR D E B A C M A A P3 A C DE A B DD A A S D E Item Description Torque Setting Catalogue No. A M12 x 50 Long Hex Hd Screw, Steel EZP 30Nm 35/101102 B M12 x 70 Long Hex Hd Screw, Steel EZP 35/101142 M12 Nut, Lock (Bent Beam) Steel EZP 30Nm 03/180167 M12 Washer, Steel EZP 03/190932 C M10 x 50 Long Hex Hd Screw, Steel EZP 35/100842 M10 Nut, Lock (Bent Beam) Steel EZP 16Nm 03/180166 M10 Washer, Steel EZP 03/190930 D M16 x 50 Long Hex Hd Screw, Steel EZP 60Nm 35/101272 E M16 x 70 Long Hex Hd Screw, Steel EZP 35/101312 M16 Nut, Lock (Bent Beam) Steel EZP 60Nm 03/180168 M16 Washer, Steel EZP 03/190936 Figure E53 E 50 R A I L T R A C K
Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E51 of 52 A label with the legend ”TRACTION VOLTAGE DO NOT REMOVE THIS LEAD” (see Figure E54) should be attached to or alongside all impedance bond leads at substations, TP huts and TIR sites. These cables are identified on the Bonding Plan as described in GK/RC0754 Part C. TRACTION VOLTAGE DO NOT REMOVE Red Lettering on White Background Figure E54 THIS LEAD 18.3 Side Lead Removal An insulated bond punch (Railway Catalogue No. 39/48850) is available and should be used for the removal of side leads from the rail where they are pinned in 22mm or 7 /8” holes. This punch may be used adjacent to the conductor rail provided the Railway Group Standard Code of Practice is adhered to. To prevent arcing whilst side leads are being removed or reconnected, particularly where bolted stud connections exist, a temporary jumper of a size equivalent to the side lead being removed, should be connected between the aluminium plate and the rail concerned before the last lead is disconnected. If the impedance bond side lead is identified by a label as shown in Figure E54, it can only be disconnected under an absolute electric traction isolation and in accordance with GK/RC0754 Part D. R A I L T R A C K E 51
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