Detached Garage 100 amp panel

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tryinghard said:
I guess you may be able to use Table 310.15(B)(6) if this is considered a ?dwelling unit? if so #2 AL XHHW or THWN can be used, but these conductors "shall not be required to be larger than their service-entrance conductors."
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A garage is not a dwelling unit:

Article 100 Definitions:
Dwelling Unit. A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.
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He doesnt have 100 a to spare . Just because you run 100a wire doesnt mean you have to install a 100 a breaker. I dont see why the big argument about the wire size , he will be lucky to spare 40 amp for the garage. Of course his best option is to upgrade to 200 amp in the house in which case he could go 100 a all the way for the garage .
 
infinity said:
A garage is not a dwelling unit:
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I've lived in them :grin:

Good point, so he does need at least #1 AL XHHW or THWN according to Tables 310.16 & 13, if he uses a 100A breaker.
 
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jetlag said:
He doesnt have 100 a to spare . Just because you run 100a wire doesnt mean you have to install a 100 a breaker. I dont see why the big argument about the wire size , he will be lucky to spare 40 amp for the garage. Of course his best option is to upgrade to 200 amp in the house in which case he could go 100 a all the way for the garage .
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jetlag,

He is not violating NEC to install a 100A breaker though, the breakers often do add up to more than the service disconnect. The service disconnect breaker cannot be less than the sum of the calculated load which is ?continuous? plus ?non-continuous?.

Often a house around 1500 sq ft with 100% electric calcs around 130A. I?d bet the new garage can calc around 70A. If anything the advice to a homeowner is to only have up to a 30A welder, heck legalistically most residential areas (even in rural) do not allow welding.
 
infinity said:
A garage is not a dwelling unit:
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And because it is not,.. this could,. very well be,. a case where the feeder conductors are larger than the service entrance conductors ,..nonsensical for sure
 
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