ECN Forum Forums Code Related Discussion NEC & other Code issues Disconnect at secondary of transformer

Hello there!
I've got a situation here where we are setting a 112.5kva480x 120/208 transformer on the roof of a building.
It will supply power to a 400Amp MCB-type panelboard below roughly 40'of conduit and wire away.
Are we required to have a fused disconnect near the transformer (word has it wthin 25')? Where in the code is this requirement if it exists?
Primary overcurrent protection is a 175amp circuit breaker.
Thanks much for any help

240.21
Read which one applys in this section for you.
Also read Table 450.3(B).

Thanks much Yoopersup.
That cleared it right up for me . A fused disconnect within 25ft it is .