240.21(B)(3) & 240.21(C)

[m sleem]

Are 13.8kv/0.48kv transformers subject to these sections ?

 

[m sleem]

It seems yes

 

[Carultch]

It seems yes

It applies to customer-owned transformers of any sort, where the primary side is on the customer's side of the main service disconnect.

If it is a utility-owned transformer, the secondary conductors would be service conductors, and 240.21(C) would no longer apply.

 

[electrofelon]

Are 13.8kv/0.48kv transformers subject to these sections ?

Sort of. If you look at 240.100(A) and 240.101(B), it appears there could be other arrangements. I am not familiar with sizing, protection and fault studies of MV systems.

 

[m sleem]

It applies to customer-owned transformers of any sort, where the primary side is on the customer's side of the main service disconnect.

Yes,
Just another question,
If the protection is required for secondary feeders, how the OCPD will be terminated directly to transformer lugs without conductors ?

 

[Carultch]

Yes,
Just another question,
If the protection is required for secondary feeders, how the OCPD will be terminated directly to transformer lugs without conductors ?

You typically get a 10 ft or 25 ft allowance for "unprotected" conductors on the secondary side, depending on which rule you follow. You then terminate at a separately-installed device with the OCPD, as close as practical to the transformer.