Feed brach circuits through fire rated wall

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anbm

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Building A and B is separated by 2 hour fire rated wall.
Can we feed the branch circuits (20A) in building B from an electrical panel in builing A? (the branch circuits will run through fire rated wall). Building A and B belong to the same owner.
 
Most MC cable now comes with a tag that specifically says "UL listed for use in 1, 2, and 3 hour through penetration fire stop systems."

EMT is also listed as part of several different fire penetration systems.
 
If they are seperate buildings, each circuit or feeder passing thru A to B will require a means of disconect. See 225.31
 
Are you sure that there are truely separate buildings?

Most firewalls that are used to separate 2 buildings are rated more than 2 hours.

What type of occupancy does each building have?

Chris
 
Class B building, I guess my question is will the code allow to have more than one circuits passing from building B to A... even both buildings belong same owner.
 
anbm said:
Class B building, I guess my question is will the code allow to have more than one circuits passing from building B to A... even both buildings belong same owner.
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If they each have their own , seperate electrical services, I don't think that you can do it.
 
One service feeds building A (main building), building A feeds building B by a single feeder. However, instead of feeding some branch circuits in building B from a panel in that building, contractor propose to feed them from a panel in building A because it is closer (and through fire rated wall). Will this be okay with NEC? I am not sure...
 
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