Tap in one building to feed a service in another?

J

JoeNorm

Senior Member
Location
WA
I have a 200 amp remote meter/main on the street that feeds a small residence. Service comes into crawlspace to a large junction box where a splice is made to feed the main panel.

I want to connect into this splice and bring a new feeder outside to a new modular small building that is being delivered. Is there any code stopping me from doing this?

It seems fine to me but not sure if I am missing something.
 
Since you have a main at the meter the house is fed by a feeder and not a service. A connection to the junction box would be a feeder tap and have to comply with the rules in 240.21(B) unless the conductors to the modular building are the same size as the feeder that supplies the house.
 
I could make them the same size. My main concern was the tap originating in the crawlspace of a different structure.
 
IMO - it would be much easier to abide by feeder tap rules that don-resqcapt19 was speaking about (and safer) if you were to make your tap from the meter/main outside, and derive your tap outside. otherwise, depending upon the size of feeder conductor you're planning to run, you're limited to the length that tap can travel through that crawlspace before hitting an OCD. that is, unless you're running full-sized 200a feeder to this outbuilding. better do some reading up on 240.21(B).
 
I agree. The trouble with that is the meter/main is 300' down the road. Running a full sized feeder would not be a big deal.
 
JoeNorm said:
I could make them the same size. My main concern was the tap originating in the crawlspace of a different structure.
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That can be the tricky part. some AHJ may look at it a little different than others. If inside portion still complies with the 10 or 25 foot tap rule they may allow it. Once outside there is no length or size limitation on feeder tap conductors other than minimum ampacity required by the load supplied of course.
 
JoeNorm said:
But is it even a tap if the wire size stays the same?
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No. A tap conductor as applies to feeder taps would be one that has lesser ampacity on it's supply side than the required overcurrent protection - but does have the required overcurrent protection at the load end of said conductor.
 
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