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Thread: Box fill question

  1. #1
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    Box fill question

    Help in answering a box fill question. Seems like the process to answer is different when dealing with wire #4 and higher.

    If I have 2 1/0
    1 #6
    2 #8
    1 # 4
    What size box would I use.
    Thanks

  2. #2
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    You would have to use 314.28 to get minimum box size.
    "Electricity is really just organized lightning." George Carlin


    Derek

  3. #3
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    Thanks

    Am I reading it right that I would have to size the wire according to what raceway it would fill going into box, then times it by 8 or six times the raceway to get minimum box. Or am I totally confused.

    Side question:
    The conductors that are between the utility and service point of connection? Would that be service entrance conductors? What's the difference in service entrance and service lateral. Thanks

  4. #4
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    Jumper, am I right that this section sizes boxes based upon not the wire size but the raceway size, and then also refers to a bending diameter for any wires? But everything is based upon the raceways or conduits?
    Student of electrical codes. Please Take others advice first.

  5. #5
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    Quote Originally Posted by Adamjamma View Post
    Jumper, am I right that this section sizes boxes based upon not the wire size but the raceway size, and then also refers to a bending diameter ...
    I apologize for the nitpicking, but it's bending radius, not diameter. Diameter is twice the radius.

  6. #6
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    Quote Originally Posted by Adamjamma View Post
    Jumper, am I right that this section sizes boxes based upon not the wire size but the raceway size, and then also refers to a bending diameter for any wires? But everything is based upon the raceways or conduits?
    Yes.
    "Electricity is really just organized lightning." George Carlin


    Derek

  7. #7
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    Quote Originally Posted by ggunn View Post
    I apologize for the nitpicking, but it's bending radius, not diameter. Diameter is twice the radius.
    Good catch, I didn’t even notice.
    "Electricity is really just organized lightning." George Carlin


    Derek

  8. #8
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    Quote Originally Posted by ExtraordiNary View Post
    Am I reading it right that I would have to size the wire according to what raceway it would fill going into box, then times it by 8 or six times the raceway to get minimum box. Or am I totally confused.

    Side question:
    The conductors that are between the utility and service point of connection? Would that be service entrance conductors? What's the difference in service entrance and service lateral. Thanks
    Yes, that is the idea. If you using cables, you use the cable connector size as if was conduit size.


    Side answer:
    Look at the definitions in 100. Lateral is usually slang for a underground service.
    "Electricity is really just organized lightning." George Carlin


    Derek

  9. #9
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    Thanks

  10. #10
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    Quote Originally Posted by ExtraordiNary View Post
    Thanks
    Of course, no problem.

    This scenario is tricky and we all are here to learn.
    "Electricity is really just organized lightning." George Carlin


    Derek

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