4 wire feed required

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jwjrw

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What is the article # requiring sub panel's to be fed with a 4 wire. I left my book at work.
 
Pipe ? Romex ? SER ? SEU ? how are you getting there?
 
Basic rule goes back to 250.24(A)(5)
Seperate building you are probably referencing 250.32(B)
 
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