secondary tap rules

[shaw0486]

I have a 45 KVA delta 480 wye 280 that sit inside and it feeds a piece of equipment outside about a hundred feet away. Doesnt the secondary need to be protected by a enclosed circuit breaker with in 25 feet and not a fused disconnect?

 

[augie47]

Unless dictated by some other reason, such as manufacturers requirements, any overcurrent device would suffice..fuse or breaker.
Being an outside tap, its possible none is needned {see 240.21(B)(5)}. Keep in mind, however, the requiremnts of Art 450 must also be met

 

[shaw0486]

but it just has to be a single set of fuses

 

[augie47]

but it just has to be a single set of fuses

based on what Code article ?

 

[jim dungar]

I have a 45 KVA delta 480 wye 280 that sit inside and it feeds a piece of equipment outside about a hundred feet away. Doesnt the secondary need to be protected by a enclosed circuit breaker with in 25 feet and not a fused disconnect?

Technically the secondary of the transformer does not need protection.

The conductors on the secondary of the transformer do need protection per article 240.21(B).