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Thread: 25 foot tap rule

  1. #11
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    Until they start putting ameperage ratings on lugs,nuts and bolts I'd have to say the tap conductor ends a the lug.

    JAP>

  2. #12
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    I would be concerned that even if you found lugs large enough the wire bending at the switch termination would be a problem.
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  3. #13
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    Quote Originally Posted by don_resqcapt19 View Post
    The tap has to originate outside the building to use 240.21(B)(5).
    Extend 1200 amp feeder to outside, make the tap outside then.

  4. #14
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    Quote Originally Posted by kwired View Post
    Extend 1200 amp feeder to outside, make the tap outside then.
    All of the tap conductors except at the point of load termination is required to be outside. Installation per 230.6 (2" concrete or brick encasement) qualifies.


    How are the taps being made to the 1200A riser? In a riser vault? Is there a splice box being used? Seems odd that a 100A fused disconnect can't be squeezed in right there somewhere.
    Last edited by Smart $; 08-12-17 at 10:49 AM.
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  5. #15
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    Quote Originally Posted by Smart $ View Post
    All of the tap conductors except at the point of load termination is required to be outside. Installation per 230.6 (2" concrete or brick encasement) qualifies.
    Extending the 1200 amp feeder to the outside does not involve a tap conductor. Then you make the tap outside and could run the feeder tap around the perimeter (on the outside) of the building several times if you wanted to, but could enter the building a short (but not specified) distance to end the feeder tap at an appropriate overcurrent device.

  6. #16
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    Quote Originally Posted by kwired View Post
    ... but could enter the building a short (but not specified) distance to end the feeder tap at an appropriate overcurrent device.
    And that's the part that matters.
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  7. #17
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    I would hope this is a bussway riser, is it not?

    Otherwise it paints a very ugly picture for me to begin with.

    JAP>

  8. #18
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    Quote Originally Posted by ron View Post
    Unless you can get a 100A disc with the ability to field replace lugs that accept 600's.
    You're not going to get 600's crammed into a 100 amp disconnect, there simply isn't the room.

    This is a job for a 400 amp disconnect and fuse reducers.

  9. #19
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    Quote Originally Posted by Cow View Post
    You're not going to get 600's crammed into a 100 amp disconnect, there simply isn't the room.

    This is a job for a 400 amp disconnect and fuse reducers.
    I tried to not be so blunt, but yes normally there simply isn't room, 1/0 or 2/0 is usually the largest conductor they are designed to accept.

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