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About This Item

 

Full Description

1. Scope

1.1

This Standard outlines the principles and general practices of electrical protection applicable to overhead supply systems operating at more than 750 V but less than 50 kV phase to phase and communications systems, where the lines of those systems are located so that inadvertent electric contact between them could occur, resulting in a contact voltage not exceeding a limit agreed to by the communication and supply companies.

1.2

This Standard applies to overhead supply and communications systems that meet the requirements of CSA Standard CAN/CSA-C22.3 No. 1 where coordinated electrical protection is specified.

1.3

The following effects are within the scope of other Standards and therefore are excluded from this Standard: (a) the effects on communications conductors entering power stations or passing through the zone of influence of that station's ground potential rise (GPR); (b) the effects of faults other than single phase-to-ground faults; and (c) the effects of longitudinal induction and ground potential rise that result from normal operating or fault conditions.