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transformer secondary and primary protection

Question asked by on Sep 13, 2019
Latest reply on Sep 23, 2019 by fourseng

A 45KVA transformer located in the basement, 460 volt 3 phase primary out to a 120/208 volt 3 phase circuit breaker panel on the second floor of a 2 story building. The primary protection is a 460 volt 3 pole breaker of the correct size in the same room as the transformer. The load center is location on the 2nd  floor. The transformer is not wired as yet.

It is my contention that the secondary conductors to the panel be protected with a fused disconnect or circuit breaker at the transformer location in the basement. The load center is a main breaker panel.

Any comments are welcome.