branch circuit from another building

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aarifisher

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is there any prohibition to supply a branch circuit from one building to another when each has a separate service and there is a fire wall between the two buildings
 
Take a look at 224.30. Generally speaking, any given building can have power coming into it by only one means. There are exceptions, but only in limited circumstances.
 
charlie b said:
Take a look at 224.30. Generally speaking, any given building can have power coming into it by only one means. There are exceptions, but only in limited circumstances.
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I am sure Charlie meant 225.30.

There is a proposal being drafted for the '11 code cycle. It permits more than what is currently code. This needs to be addressed in the comment stage.
I think that permitting a branch circuit from one building that has its own service, to another building that also has its own service is a potential hazard, but should be permitted under the strict requirements mentioned in the section above.
 
There could be undesirable EGC currents if you interconnect the EGC systems, and undesirable voltage differences if you don't do so.

It could be possible that two such services don't even share the same utility transformer. That shouldn't make a difference, but . . .
 
aarifisher said:
its indoor branch circuits not outside
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If this branch circuit is passing from one building to another building then at some point even if it is for 1/8 of an inch it will be outside.

Part II of Article 225 deals with more than one structure or building.

Chris
 
IMHO, Part II of Article still applys to this situation because we have 2 buildings on the same lot even though the 2 buildings might only be separated by a firewall.

Chris
 
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