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Entry type: FAQ Entry ID: 109758803, Entry date: 12/17/2018
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Clearance and creepage distances according to UL 508 / UL 60947-4-1 for 3RV2 circuit-breakers with 3RV1915-.. 3-phase busbar supply.

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This article contains a statement on clearance and creepage distances according to UL 508 / UL 60947-4-1 for circuit-breakers with 3-phase busbar supply.

QUESTION:

According to UL 508  / UL 60947-4-1, do the clearances and creepage distances in the feeder circuit also have to be observed for the following 3RV2 circuit-breakers, which are connected in the 3RV1915 3-phase busbars without supply terminal 3RV2925-5EB?

 

 

ANSWER:

Clearance and creepage distances according to UL508 / UL 60947-4-1  only have to be observed in the feeder circuit at the first infeed circuit breaker with the supply terminal 3RV2925-5EB.
All subsequent 3RV2 circuit breakers which are supplied by the 3-phase busbar do not have to comply with clearance and creepage distances.