involve a number of approximations and estimates, some judgment is required in applying the results of a short-circuit calculation to the selection of apparatus.Making capacity i.e. maximum fault current, device can carry, if it is closed in to the fault should be considered.

Breaking capacities

Miniature circuit breakers and fuses may be rated to interrupt as little as 85 amperes and are intended for supplementary protection of equipment, not the primary protection of a building wiring

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