Home standby generator feeder sizing

[electro7]

I was wondering if you can size home standby generator feeders according to 310.15(B)(6)? I'm talking residential single phase generators. If the generator has an OPCD integrated at 100A can I use #4 CU AWG?

Would the generator be considered the "main power feeder to the dwelling" according to that section in a power outage?

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[tom baker]

What size is the utility service? Can the genny carry the entire connected load?

 

[electro7]

Say the service is 200A. We often install say a 22kw with a 100A OCPD integrated to the generator. Our feeder conductors land on the load side of that breaker. We use a 200A ATS to allow for full 200A service pass through during normal utility operation.

So I would assume in most cases, without doing a load calculation, the genny would not be able to carry the full load.

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[augie47]

I've seen that questions answered both ways.
When it became an issue in this part of the State, the AHJ ruled that you could not apply (B)(7) in that the load did not represent the "entire load OF THE DWELLING (there was load shed) therefore there was not the required diversity.

 

[electro7]

I see. That can make sense to me. Probably stick with #3 awg. Thanks

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