Back-up Protection

Circuit-breaker manufacturers publish tables showing combinations of pairs of circuitbreakers, one upstream,one downstream,where the downstream device can be used at a location where the prospective fault current (Ipf) is higher than its breaking capacity (Icu).


The Icu of the upstream devicemust equal or exceed Ipf at its point of installation.

security

state of relative freedom fromย threatย (3.13)ย or harm caused by deliberate, unwanted,

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