Overcurrent protection requirment for feeders on a 12.47 kV/480 volt xfmr

[Mr. Al]

I am a bit confused with the NEC 240.21 (C). Here is my situation I have an outdoor industrial location where only trained personnel have access. There is a single load refrigeration machine rated for 500 amps. It will be fed from a 12.47 kV/480 V transformer. Will the underground conductors feeding this machine be required to have over-current protection and or a disconnect. I do not yet have all the cut sheets for this machine, but would guess something of this size would have a disconnect built into it and some sort of internal fusing. The distance of the machine from the xfmr is approximately 50 feet. Thank you in advance

 

[augie47]

It is my opinion, that 240.21(C)(5) would allow you to run these conductors unprotected if all the conditions in that section are met. I would think one would need to assure that the conditions of 450.3(a) were also met.

 

[Mr. Al]

Thank you

Thank you

It is my opinion, that 240.21(C)(5) would allow you to run these conductors unprotected if all the conditions in that section are met. I would think one would need to assure that the conditions of 450.3(a) were also met.

Thank you for your help. I do not know if it is improper on this site to express appreciation!