Optional Residential Load Calcs - Three Phase Service

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hbendillo

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South carolina
I read 220-82 and my interpretation is that you can only use the "Optional Feeder and Service Load Calculation" for a 3-wire service. Therefore three phase services do not qualify unless there is something elsewhere in the code that says otherwise. Can someone confirm this for me?

Thanks.
 
You are correct, 220.82 only applies to a 3-wire feeder or service.

Your three phase service should be calculated using the standard method in Part III of Art. 220.
 
What is the reason behind not allowing a three-phase service to use the optional method beside perhaps sizing of the neutral? I am imagining it is all about load balancing between the phases.
 
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