emergency power/comerical power

[Jeff Rae]

can you have both emergency power and comerical power in the same box. the emergency power is feed the same comerical but is backed by a generator. this is at a hospital

 

[iwire]

Re: emergency power/comerical power

Mostly no but sometimes yes.

You have to look at 700.0(B) if what your talking about is actually emergency circuits as defined in Article 700.

Remember not all generator powered circuits are 'emengency circuits' some are legally required (Article 701 and others are optional standby (Article 702)

700.9(B) Wiring. Wiring of two or more emergency circuits supplied from the same source shall be permitted in the same raceway, cable, box, or cabinet. Wiring from an emergency source or emergency source distribution overcurrent protection to emergency loads shall be kept entirely independent of all other wiring and equipment, unless otherwise permitted in (1) through (4):

(1) Wiring from the normal power source located in transfer equipment enclosures

(2) Wiring supplied from two sources in exit or emergency luminaires (lighting fixtures)

(3) Wiring from two sources in a common junction box, attached to exit or emergency luminaires (lighting fixtures)

(4) Wiring within a common junction box attached to unit equipment, containing only the branch circuit supplying the unit equipment and the emergency circuit supplied by the unit equipment

There also may be other rules for hospitals that are in other codes.

 

[caj1962]

Re: emergency power/comerical power

Jeff
Please make yourself familiar with 517 if you are going to work in a hospital.