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Thread: Missing EGC

  1. #1
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    Missing EGC

    I have an existing 480 volt 3 phase 20 mp circuit to a roof exhaust. I need to replace the blower motor. There are [3] phase conductors in 1/2 EMT with no EGC. Is it OK to use the EMT as an equipment ground or should I run a new green conductor? I'm in a steel building, can I just ground the motor to the building frame? It's about a 300 foot run so running a new wire in the 1/2 EMT won't be easy. Thanks

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    Read 250.118

    Roger
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    Quote Originally Posted by Nomad86 View Post
    I have an existing 480 volt 3 phase 20 mp circuit to a roof exhaust. I need to replace the blower motor. There are [3] phase conductors in 1/2 EMT with no EGC. Is it OK to use the EMT as an equipment ground or should I run a new green conductor? I'm in a steel building, can I just ground the motor to the building frame? It's about a 300 foot run so running a new wire in the 1/2 EMT won't be easy. Thanks
    No, you need an EGC. It can be the raceway if it complies with Roger's code reference.
    Rob

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    All responses based on the 2014 NEC unless otherwise noted

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    Code support for Post 3: See 250.136(A)
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

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