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Thread: Common EGC parallel circuit

  1. #1
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    Common EGC parallel circuit

    Hi everyone, I am running 3 feeder circuits underground from A to B and using a common EGC in the trench, the 3 circuit conductors will have a transition to a bottom entry equipment using PVC 90 sweeps (one PVC 90 per circuit), my question is how am I supposed to bring the EGC inside the equipment, can I just pull the common EGC into any one of the three conduits (violation of circuit conductors must run with EGC in the same raceway) or I need to make 3 taps off the common EGC into each conduit (each circuit conductors will have a separate EGC running in the same conduit). I am also thinking what if in a different scenario where I need to run 3 parallel conductors (only one circuit) underground and make the transition, how do I bring the common egc into the equipment to comply with 310.H.(3)
    Thanks a lot for the help!
    Last edited by hill900505; 05-14-17 at 12:52 PM.

  2. #2
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    Does from A to B mean from one structure to another?


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  3. #3
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    lIf I understand your description of the installation you will be in violation of 300.3(B). Now, if you are actually paralleling these feeders to make one you will have to have a full size EGC in each raceway.

    Roger
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  4. #4
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    Quote Originally Posted by electricalist View Post
    Does from A to B mean from one structure to another?

    Sent from my iPhone using Tapatalk
    It is from a switchgear to three ac panels.

  5. #5
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    Quote Originally Posted by hill900505 View Post
    Hi everyone, I am running 3 feeder circuits underground from A to B and using a common EGC in the trench, the 3 circuit conductors will have a transition to a bottom entry equipment using PVC 90 sweeps (one PVC 90 per circuit), my question is how am I supposed to bring the EGC inside the equipment, can I just pull the common EGC into any one of the three conduits (violation of circuit conductors must run with EGC in the same raceway) or I need to make 3 taps off the common EGC into each conduit (each circuit conductors will have a separate EGC running in the same conduit). I am also thinking what if in a different scenario where I need to run 3 parallel conductors (only one circuit) underground and make the transition, how do I bring the common egc into the equipment to comply with 310.H.(3)
    Thanks a lot for the help!
    This is the same as if you had the circuits in a common raceway (the trench) with one EGC and then transitioned to three raceways at the end. Those three raceways would each require an EGC.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  6. #6
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    Quote Originally Posted by roger View Post
    lIf I understand your description of the installation you will be in violation of 300.3(B). Now, if you are actually paralleling these feeders to make one you will have to have a full size EGC in each raceway.

    Roger
    Thank you!
    If I understand your description of the installation you will be in violation of 300.3(B).
    Does it mean a single common EGC can not be pulled into any of the three conduits instead I need to make three taps right before the circuit conductors enter the pvc sweep and pull one tap EGC in each PVC 90? There are already three taps off the common EGC in the trench where the three circuits start, I am just not sure if I have to make another three taps where the circuits end.

  7. #7
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    Quote Originally Posted by hill900505 View Post
    Thank you!
    If I understand your description of the installation you will be in violation of 300.3(B).
    Does it mean a single common EGC can not be pulled into any of the three conduits instead I need to make three taps right before the circuit conductors enter the pvc sweep and pull one tap EGC in each PVC 90?
    Yes, each raceway will have to have it's own EGC.

    Roger
    Moderator

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