Sizing XFMR secondary conductors based on Cranes short time motors

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Isaiah

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Location
Baton Rouge
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Electrical Inspector
I have a rather atypical installation where a switchgear is feeding exclusively overhead crane loads.
Over 95% of the crane motors are short time
motors.
My question is sizing the cable from XFMR the secondary feeding the SWGR MCB: Should the cable ampacity be based on 610.14(A) or 310.16?


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Yo Isaiah! I think that's 310.16 all the way.
I agree that the conductors will likely never conduct at ampacity, but I think the NEC's intention is that 610.14(A) only applies to motor conductors.
John
 
mayanees said:
Yo Isaiah! I think that's 310.16 all the way.
I agree that the conductors will likely never conduct at ampacity, but I think the NEC's intention is that 610.14(A) only applies to motor conductors.
John
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I think you’re right.


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