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Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E30 of 52 16 Impedance Bond Installation Withdrawn Document Uncontrolled When Printed <strong>General</strong> <strong>Information</strong> on Track Circuits 15.5.7 Style M2/5 Description Catalogue No Coil, condenser : 88/26065 Plate, lug, steel (pairs with screws) for fitting side connections : 88/83987 15.5.8 Style M6 Obsolete, parts out of production. 15.5.9 Style DD Description Catalogue No Coil, auxiliary : 88/83553 Gasket, main cover : 88/27047 15.5.10 Style B Description Catalogue No Coil auxiliary : 88/83958 Terminal box : 88/25802 Cover, terminal box : 88/83959 15.5.11 <strong>General</strong> Spares Description Catalogue No Sealing Compound Red Hermabte no. 5400 : 7/60180 Oil, insulating (impedance bonds) 2.5 litre : 27/13802 CAUTION: Care should be taken to avoid trapping fingers when handling impedance bonds. 16.1 Type 3 Impedance Bond Type 3 impedance bonds supplied to BR863 have blanking plates, grommets or plastic plugs in the terminal box holes, together with one M25 gland, for 2c Type C2 2.5mm²(f) and four M20 glands, for single core Type C1 2. 5mm²(f). The impedance bond is also supplied with resilient mountings, either fitted or supplied separately. The resilient mounting feet comprise two portions and, if not already fitted, should be glued together using Araldite Rapide or Araldite (Railway Catalogue No. 7/103330). The cable glands should be fitted as required and the internal lock nuts glued with Araldite. If unused holes are fitted with plastic plugs, these should be replaced with threaded blanking plates. Surplus blanking plates, grommets and glands should be retained as spares. In instances where the auxiliary coil box is prone to water accumulation, a 3mm hole may be carefully drilled in the bottom of the terminal box and all swarf cleared away. The bond is now ready for installation. The standard installation arrangements for Type 3 bonds on concrete or wooden sleepers (Howells or WBS Style WH3) are shown in Figure E26, Figure E27 and Figure E28. E 30 R A I L T R A C K
<strong>General</strong> <strong>Information</strong> on Track Circuits CL 200 200 Withdrawn Document Uncontrolled When Printed Railway Group Approved Code of Practice GK/RC0752 Issue Two Date December 1998 Page E31 of 52 After installation, it is particularly important to ensure that all glands are securely tightened onto the cables and that all unused entry holes are properly sealed. This will reduce the incidence of failures resulting from an accumulation of brake dust on the terminal block and tuning capacitor. Debris exclusion covers should be fitted to Type 3 bonds: For WBS WH3 Railway Catalogue No 86/17030 For Howells WH3 Railway Catalogue No 86/17031 Note Under no circumstances may a bond be commissioned unless all glands are correctly fitted and any unused holes are fitted with a threaded blanking plate. For drilling of holes in concrete sleepers/bearers, see GK/RC0754 Part D. Figure E26 shows the Typical Pin Brazed Arrangement for the Type 3 Impedance Bond. Arrangement This Side of IRJ To Be Used For Double/Single & Double/Double Layout For Type 3 Bond Bond Not Secured To sleeper At This End For Cable Lengths See Section E18 85 240 85 85 240 200 85 200 Cable Lugs Secured on Top of Bond Lug Holes for Temporary Jumpers When Required Cable Lugs Secured Underside of Bond Lug For Rail Connections see Section E8 R A I L T R A C K E 31 I.R.J. For Arrangement This Side of IRJ See Figure E27 & Figure E28 For Busbar Packing See Section E17 For Busbar Details See Section E17 All Cables To Be Clear of Tamping Zones See Section E6 I.R.J. For securing bond on concrete sleepers drill on centre line at 400 ctrs 12 dia and secure with Hilti heavy duty anchors HSA 12x 110 Hilti code 66337 (2 OFF). For wooden sleepers use coach screws 5/8" x 6". Catalogue No 35/13950. Screws not to be driven fully home but left approximately 25 above bond lugs. Figure E26
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General Information on Track Circuits - RGS Online

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