Feeding a tranformer

[JaxELectric]

Hey guys, hope all is well-

I am installing a 75KvA step up transformer directly of a meter bank (225a socket) for a laser metal fabricator. I am having trouble finding why I would need a neutral there. This xfmr will be powering a small panel where I can derive a neutral from xo if I needed a 277v circuit. Am I correct in this thought? Any help will be appreciated!

 

[don_resqcapt19]

A grounded conductor is required to be run to the service disconnect. From the disconnect to the transformer will not require a grounded conductor.

If I was installing that transformer I would probably want a 300 amp breaker on the primary side (assuming a 208 primary voltage). You will also require protection for the secondary conductors per one of the part of 240.21(C).

 

[JaxELectric]

A grounded conductor is required to be run to the service disconnect. From the disconnect to the transformer will not require a grounded conductor.

If I was installing that transformer I would probably want a 300 amp breaker on the primary side (assuming a 208 primary voltage). You will also require protection for the secondary conductors per one of the part of 240.21(C).

I may indeed disconnect it at 300amps, but the disconnect is in the meter bank, before entering the building. I am not sure if that xfmr disconnect is the main. Thanks for the heads up!