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Is it necessary the Bus Coupler should have same current rating as that of the incomer switch/breaker?

April 26, 2017breaker bus coupler incomer necessary rating Switch

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Is it necessary the Bus Coupler should have same current rating as that of the incomer switch/breaker?

1 Answer

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The bus coupler rating need to be same as that of the incomer switch/breaker, only if we notice a chance to carry the same load through the bus portion. Otherwise, why we need to insist so? To convince yourselves, just consider the bus coupler as a sub circuit incomer and the bus portion as the sub switch board.