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NEC 310.12(A) One-Family Dwelling Service Conductors & Feeders

ICE said:
Why then is the 100% factor mentioned in 310.12(B) with regards to a dwelling feeder? In what circumstance would the 100% of the load apply to a dwelling feeder?
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Any multifamily building (even a duplex) will likely have a service that supplies multiple dwelling units, and that service does not meet the requirements of 310.12(A). But then if a dwelling unit has a subpanel in it that supplies all the dwelling unit's loads, the feeder to that subpanel would satisfy 310.12(B), assuming it is rated between 100A and 400A.

Cheers, Wayne
 
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This was a problem for 100A exterior main disco "services" here where they would put the main outside and run what they normally would for a service sized SER in and then they would have to put a smaller main breaker in as the feeder and service ampacities were/ are different....
 
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