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    Emergency + Normal Lighting in an Operating Room

    I have understood it is common practice to provide some emergency power and some normal power to lighting in an operating room (plus some battery backed equipment per 517.63) I can't find any code reference in NEC or NFPA 99 that specifically says that 50% of the lights in an OR must be on emergency power and 50% on normal power. Is this a code requirement, or just a practice used in some hospitals?
    Lawrence Lile, P.E.

    #2
    location

    in some states they have there own healthcare requirements in addition to national codes and standards.

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      #3

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        #4
        I'm not sure there is any code that says you have to include lights from the normal power branch. 517.19 says you need branch circuits from both normal and emergency branches, but it doesn't say lighting has to be included on each circuit.

        So I think you could run all the lights from the emergency branch, and comply with the code. I also think that would be a very bad design.

        What if a circuit breaker tripped on the load side of the transfer switch? Then all your lighting would be out (except the battery light.)

        It's kind of hard to explain why an OR got plunged into darkness when the rest of the hospital is operating normally on utility power. I've seen this happen with other firm's designs.

        Even better than emergency and normal power for the lights are two separate transfer switches with two separate critical branches. You might even consider running them from two separate generators.

        Steve

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          #5
          No codes require 50%N and 50%E lights in OR or any patient rooms. The idea is when loosing normal power, doctor still have enough emergency lighting to do his job. Also think about size/cost of generator /ATS if you put too many load on emergency branches.

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