We're installing a new detached greenhouse. We want to bring both normal and emergency power from the nearby existing building. Is this allowed by the NEC.
Junior Member
We're installing a new detached greenhouse. We want to bring both normal and emergency power from the nearby existing building. Is this allowed by the NEC.
Moderator
Yes. Reference 225.30(A). But I think it is more likely to be appropriate to call this an "Optional Standby" system, rather than "emergency."
Welcome to the forum.
Charles E. Beck, P.E., Seattle
Comments based on 2014 NEC unless otherwise noted.
Moderator
I agree with Charlie and will add that if you actually have 'emergency' circuits they will have to be kept separate. If the circuits are as Charlie said 'optional standby' then they can be mixed with the normal wiring.
Most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design and unnecessary complexity should be avoided.
Senior Member
Make sure you include disconnects in the building for the circuits you bring over.
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