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Disconnect at secondary of transformer #184631
02/15/09 12:25 AM
02/15/09 12:25 AM
R
Rhiney  Offline OP
New Member
Joined: Feb 2009
Posts: 3
California
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

2017 / 2014 NEC & Related Books and Study Guides
Re: Disconnect at secondary of transformer [Re: Rhiney] #184632
02/15/09 12:41 AM
02/15/09 12:41 AM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 849
Michigan
240.21
Read which one applys in this section for you.
Also read Table 450.3(B).

Last edited by Yoopersup; 02/15/09 12:44 AM.
Re: Disconnect at secondary of transformer [Re: Yoopersup] #184633
02/15/09 01:41 AM
02/15/09 01:41 AM
R
Rhiney  Offline OP
New Member
Joined: Feb 2009
Posts: 3
California
Thanks much Yoopersup.
That cleared it right up for me . A fused disconnect within 25ft it is .


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