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Thread: shunt trip for elevators

  1. #1
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    shunt trip for elevators

    Is there any code that states I cant run the 2 #12 wires for the shunt trip in the same conduit as the feeder for that elevator car???

  2. #2
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    Quote Originally Posted by copper chopper View Post
    Is there any code that states I cant run the 2 #12 wires for the shunt trip in the same conduit as the feeder for that elevator car???
    Don't have it handy, but mixing Class 1 and Class 2/3 circuits in the same raceway is a no-no IIRC.

  3. #3
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    The derating required for over 3 current carrying conductors will reduce the ampacity of the feeder.

    It makes no sense but I don't see any exceptions to get around it.

    Gadfly, the shut trip would not be class 2 or3.

  4. #4
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    Quote Originally Posted by iwire View Post
    The derating required for over 3 current carrying conductors will reduce the ampacity of the feeder.

    It makes no sense but I don't see any exceptions to get around it.

    Gadfly, the shut trip would not be class 2 or3.
    It is if it's operating off a 24 volt coil. Actually, I assumed that the pair he's talking about was running from the addressable relay module back to the elevator controller, which I admit may not be what he was saying.

  5. #5
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    Quote Originally Posted by gadfly56 View Post
    It is if it's operating off a 24 volt coil. Actually, I assumed that the pair he's talking about was running from the addressable relay module back to the elevator controller, which I admit may not be what he was saying.
    The only shunt trip breakers I have installed have all had 120 VAC trip coils.

    We would be running that 120 VAC through an addressable fire alarm relay.

  6. #6
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    NO derating required

    725.51(B)(2)

  7. #7
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    Quote Originally Posted by fmtjfw View Post
    725.51(B)(2)


    2011 NEC

    725.51(B)(2)

    (B) Power-Supply Conductors and Class 1 Circuit Conductors.
    Where power-supply conductors and Class 1 circuit
    conductors are permitted in a raceway in accordance
    with 725.48, the number of conductors shall be determined
    in accordance with 300.17. The ampacity adjustment factors
    given in 310.15(B)(3)(a) shall apply as follows:



    (2) To the power-supply conductors only, where the Class
    1 circuit conductors do not carry continuous loads in
    excess of 10 percent of the ampacity of each conductor
    and where the number of power-supply conductors is
    more than three
    Thanks.

  8. #8
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    Quote Originally Posted by gadfly56 View Post
    It is if it's operating off a 24 volt coil. ...
    Maybe not. Just because it is a 24 volt system does not automatically mean that it is a class 2 system. It is only a class 2 system if the power supply is a listed class 2 power supply.
    Don, Illinois
    "It is the first responsibility of every citizen to question authority." B Franklin

  9. #9
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    thank you iwire and you are correct it is 120 volt coils . so I will pull them in with the feeder, this saves me about 200 feet of 1/2" conduit and labor to install it...

  10. #10
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    Quote Originally Posted by iwire View Post
    2011 NEC


    Thanks.
    I put that every year on the WV SkillsUSA Motor Controls test written part. It's in an article lots of people never look at. As the OP said, it can save you time and money.

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