Wire Sizing Between Disconnect and Sub-Panel

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kp542

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I am looking to determine the appropriate sized wiring between a disconnect in a feeder panel and a sub-panel. Both the disconnect and the sub-panel are rated for 400A and I would like to know whether I would size the next size up (#600) or next size down (#500) wire.
 

charlie b

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Staff member
Location
Lockport, IL
Occupation
Retired Electrical Engineer
Is there a load calculation? If not, then you need the feeder to handle every bit of the 400 amps. So a 500 MCM copper conductor would not suffice. But if a load calculation has a result of 380 amps or lower, you can use the 500's.
 
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