A circuit breaker is located only on the primary side of a 960 volt transformer in a supervised installation. According to article 450 of NEC, this breaker shall be set at no more than ___ of the rated primary current of the transformer.

A circuit breaker is located only on the primary side of a 960 volt transformer in a supervised installation. According to article 450 of NEC, this breaker shall be set at no more than ___ of the rated primary current of the transformer.