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Connecting multiple evaporators on same branch circuit?

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    Connecting multiple evaporators on same branch circuit?

    I can't find the section in article 440 for branch circuit short circuit and ground fault protection for connecting multiple AC units on the same circuit. So is this even allowed?

    If I there's four indoor evaporators that draw very little current (1.5 amps each), it would seem wasteful to have to run individual branch circuits to each unit. I know article 430 allows multiple motors on the same branch circuit or feeder circuit.

    #2
    Originally posted by cppoly View Post
    I can't find the section in article 440 for branch circuit short circuit and ground fault protection for connecting multiple AC units on the same circuit. So is this even allowed?

    If I there's four indoor evaporators that draw very little current (1.5 amps each), it would seem wasteful to have to run individual branch circuits to each unit. I know article 430 allows multiple motors on the same branch circuit or feeder circuit.
    Do you want all your evaporators to stop because of one failure?
    Tom
    TBLO

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      #3
      Will the breaker lug be big enough to begin with?

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        #4
        They're for small offices so it wouldn't be a concern if a few offices fail together.

        Not sure if I follow on the lugs point. Just one set of conductors would come out of the breaker and a junction box would be at each unit to tap these branch circuit conductors.

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          #5
          Originally posted by cppoly View Post
          I can't find the section in article 440 for branch circuit short circuit and ground fault protection for connecting multiple AC units on the same circuit. So is this even allowed?
          Article 440 wouldn't apply to your indoor evaporators.

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            #6
            Originally posted by david luchini View Post

            Article 440 wouldn't apply to your indoor evaporators.
            Oh thanks, can you explain why. Which article applies then 430?

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              #7
              Originally posted by cppoly View Post

              Oh thanks, can you explain why. Which article applies then 430?
              The evaporator unit doesn't contain a hermetic refrigerant motor-compressor. See 440.3(B), and also 440.1.

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                #8
                Thanks. In your opinion does this fall under article 430 then?

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                  #9
                  I'd put all 4 on a single 20a circuit, not give it a 2nd thought, and, let em rock and roll.

                  JAP>

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