VRIOGS 010.7 RevA - Public Transport Victoria

VRIOGS 010.7 Revision A 276.9.7 Reuse1. Where re-use of existing impedance bonds is specified or has beenauthorised by the Infrastructure Manager, the impedance bonds are to betested to ensure they are within Infrastructure Manager’s specifications, andall bonding cables shall be supplied and installed by the Constructor.2. The Constructor shall re-cable to VRIOGS Standards any existing impedancebonds which are to be retained in service, and also those that are not installedto current Specifications, or are not fit for service.6.10 Overhead Wiring Switches and Temporary Rail ConnectionsRail connections for overhead wiring switches and temporary overhead wiringconnections such as is used for “earthing protection” when Permits To Work onoverhead wiring are issued, shall only be made to rails connected to the tractionreturn system.These are:• Traction rails of single rail track circuits.• And for areas where both rails of a track circuit /section are used fortraction return, the closest rail to the overhead switch shall be utilised forthe connection, so as to minimise cabling and exposure of damage to thecable.6.11 Friction Buffer Stops and BondingFriction Buffer Stops rely on being clamped to the rails to achieve their frictionalsliding characteristics. Where friction buffer stops are provided on track circuitedlines, insulated rail joints are to be provided before the buffer stops to ensure thecorrect operation of the track circuit. Bonding shall be provided to ensure that therails the buffer stop is mounted on are connected to the traction return system.6.12 Traction Overhead “Air Gaps” and placement in relation to signalsOn electrified lines, signals that display a stop aspect must be located sufficiently farfrom an air gap to ensure that a train is not brought to rest with its pantograph in theair gap section.Air gaps and Sectioning Switches must not be located within 100 metres on theapproach side of signals.NOTE: This document is controlled only when viewed on the DOT Engineering Standards website.Any other copy of this document is uncontrolled, and the content may not be current.