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Posted By: Rhiney Disconnect at secondary of transformer - 02/15/09 04:25 AM
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
Posted By: Yoopersup Re: Disconnect at secondary of transformer - 02/15/09 04:41 AM
240.21
Read which one applys in this section for you.
Also read Table 450.3(B).
Posted By: Rhiney Re: Disconnect at secondary of transformer - 02/15/09 05:41 AM
Thanks much Yoopersup.
That cleared it right up for me . A fused disconnect within 25ft it is .
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