VRIOGS 010.7 RevA - Public Transport Victoria

30 VRIOGS 010.7 Revision AFigure 4 Bonding for Traction Current Return and Fault ProtectionBecause of the single ended nature of this path a traction fault at the extremity will bethe worst-case design situation. Under this circumstance not only must the DCCBtrip out but also the voltage rise in the rail relative to the surrounding s must beconstrained within an acceptable level.7.3.6 Acceptable Levels1. The acceptable voltage level at the rail is determined by the hazard suchvoltage implies. For most signalling equipment suitable surge arrestors orsimilar should be used on electrified tracks to cope with any expectedvoltage surge.2. The more relevant hazard however is to personnel who may be in contactwith the rails when a fault occurs. As these tracks will be considered nonelectrifiedit is unlikely that work methods will require the rails to bespecifically earthed and it may be expected that individual rails or bondingcables may be disconnected during work procedures without taking apossession of the adjacent electrification infrastructure.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.