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3-way and 4-way switching on 208V fluorescent lights

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    3-way and 4-way switching on 208V fluorescent lights

    Is there anything in the 2011 NEC that requires all ungrounded conductors to be opened by the light switch? I've seen 410.104(B) cited in similar situations but I can't see how a wall switch can be considered a 'switching device of auxiliary equipment.'

    Each lighting circuit will be served by a 2-pole, lockable off, branch circuit breaker. The fixtures are 6-lamp T5HO and will be installed in a Class I, Div. 2 hazardous area.

    Thanks.

    #2
    The ballast is auxiliary equipment to the lamps.


    410.104 Electric-Discharge Lamp Auxiliary Equipment.
    (A) Enclosures.
    Auxiliary equipment for electric-discharge
    lamps shall be enclosed in noncombustible cases and treated
    as sources of heat.

    (B) Switching. Where supplied by the ungrounded conductors
    of a circuit, the switching device of auxiliary equipment
    shall simultaneously disconnect all conductors.

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      #3
      Unfortunately, the end result is that you will need to find full double-pole double-throw switches for the 3-way locations and four-pole double-throw (or four-pole crossover) switches for the 4-way locations.
      Or use control wires and a contactor.

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        #4
        Thanks for the input guys, much appreciated.

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          #5
          Originally posted by GoldDigger View Post
          Unfortunately, the end result is that you will need to find full double-pole double-throw switches for the 3-way locations and four-pole double-throw (or four-pole crossover) switches for the 4-way locations.
          Cost effective?
          Or use control wires and a contactor.
          Yup.

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            #6
            If using control wires and a contactor you may even save more by using class 2 control circuit and CL2 cables.
            I live for today, I'm just a day behind.

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