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Switching the neutral

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    Switching the neutral

    I have an equipment specification with the following sentence in it and I want to verify that this is covered in the NEC.

    The sentence is: "With repect to AC control wiring, no neutral wire shall pass through the contacts of a control relay or contractor i.e. a device shall not be shut off or disengaged by breaking the device's neutral conductor."


    The sentence talks about control wiring I think control or power is not to be switched.


    I don't want to be repeating myself so if it is in the NEC it doesn't need to be in my spec.

    #2
    Just remember not to gig your contractor for factory wired overloads.

    I don't know of any manufacturer that doesn't break the neutral through the OL's in their motor starters.
    Some people are like slinkies. They serve absolutely no useful purpose. But still put a smile on your face when pushed down a flight of stairs.

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      #3
      This section sort of answers your question. I will look for a better reference since a relay or contactor is not a switch or breaker.

      404.2(B) Grounded Conductors. Switches or circuit breakers
      shall not disconnect the grounded conductor of a circuit.

      Exception: A switch or circuit breaker shall be permitted
      to disconnect a grounded circuit conductor where all circuit
      conductors are disconnected simultaneously, or where
      the device is arranged so that the grounded conductor cannot
      be disconnected until all the ungrounded conductors of
      the circuit have been disconnected.
      "Electricity is really just organized lightning." George Carlin


      Derek

      Comment


        #4
        Originally posted by masterinbama View Post
        Just remember not to gig your contractor for factory wired overloads.

        I don't know of any manufacturer that doesn't break the neutral through the OL's in their motor starters.
        "Electricity is really just organized lightning." George Carlin


        Derek

        Comment


          #5


          I was referring to the overload blocks or relays built into the starter.
          Some people are like slinkies. They serve absolutely no useful purpose. But still put a smile on your face when pushed down a flight of stairs.

          Comment


            #6
            Originally posted by masterinbama View Post
            I was referring to the overload blocks or relays built into the starter.
            Oops! Sorry.
            "Electricity is really just organized lightning." George Carlin


            Derek

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