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  1. Replies
    6$$
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    111

    Thanks for the replies. Hoping I don't have to...

    Thanks for the replies. Hoping I don't have to go ask the AHJ on this but maybe there's no other way.
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    6$$
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    111

    They are both 40 space panels full of branch...

    They are both 40 space panels full of branch breakers. So they need mains regardless.
  3. Replies
    6$$
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    111

    Service OCPD location

    I have a site with a 400A switch at the service, unfused I believe.

    The conductors from this switch go through a utility CT cabinet and then into a gutter where they are spliced into two sets of...
  4. Replies
    7$$
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    167

    It used to be that solar suppliers would sell...

    It used to be that solar suppliers would sell you, say, a 50ft conductor with a positive and negative MC4 on the ends, so you could cut it in the middle and extend your panel leads, say, 25ft to your...
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    3$$
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    208

    Yes. One or both of them may need a hold-down...

    Yes.

    One or both of them may need a hold-down kit on the breaker. It depends if they stay live when disconnected. I believe one of them would be setup as master and would stay live.
  6. There are potentially voltage drop issues that...

    There are potentially voltage drop issues that could go beyond the rating of the transformer, too. But overall I think you are right to be suspicious that they are trying to get you to pay for...
  7. What they are saying makes little sense based on...

    What they are saying makes little sense based on the information given. You might seriously ask them if their engineer got the decimal point wrong. 37kW instead of 3.7kW.

    If you already have...
  8. Actually I'll amend my last post somewhat to echo...

    Actually I'll amend my last post somewhat to echo electrofelon's. If they told you that they existing transformer is 50kVA, it makes zero sense to tell you that you can only backfeed 3.7kW, unless...
  9. Yeah all those details are pretty much...

    Yeah all those details are pretty much irrelevant...This is not about the NEC. The utility's grid is what's at stake and it is not covered by the NEC.

    It comes down to the fact that 26kW is a...
  10. Simple example: if you bore one set of holes...

    Simple example: if you bore one set of holes through three studs in a row and run two cable through, you are not maintaining spacing. If your bore two sets of holes, you are.

    With what the OP...
  11. Replies
    17$$
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    1,474

    The earth is a much, much larger conductor.

    The earth is a much, much larger conductor.
  12. Replies
    31$$
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    1,437

    In other words, for EGCs, the pigtail doesn't...

    In other words, for EGCs, the pigtail doesn't need to be larger than the largest EGC you're pigtailing.

    ....

    One time I was dealing with a poor quality neutral bar and the last couple set...
  13. Replies
    31$$
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    1,437

    Only for EGCs, see 408.41 already quoted above.

    Only for EGCs, see 408.41 already quoted above.
  14. Replies
    18$$
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    624

    Interesting. But that would be a 'local...

    Interesting. But that would be a 'local ammendment' that has no basis in the NEC.
  15. Replies
    18$$
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    624

    Huh? If the lighting bus qualifies for your...

    Huh? If the lighting bus qualifies for your backfeed then that's it, you're done.
  16. Replies
    9$$
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    419

    (Thread drift alert...) I believe the solar was...

    (Thread drift alert...)
    I believe the solar was about 3kW, requiring a 20A breaker. The homeowner had a 1950s vintage 30A fused disconnect feeding a 1980s vintage 125A panelboard. If we had wanted...
  17. Replies
    9$$
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    419

    I've seen a 30A service on a single family home. ...

    I've seen a 30A service on a single family home. We even installed solar on it. :happyyes:
  18. Replies
    3$$
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    362

    Good to know.:thumbsup:

    Good to know.:thumbsup:
  19. Replies
    18$$
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    624

    I agree.

    I agree.
  20. Replies
    18$$
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    624

    It might be more useful to share a picture or...

    It might be more useful to share a picture or diagram of the panel and interconnection. Otherwise we're just speculating about what might be relevant. As mentioned, there are no special rules so...
  21. Replies
    17$$
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    1,113

    I don't think it even gets that far. Unless I...

    I don't think it even gets that far. Unless I signed an NDA in order to see the quote (in which case I can be sued for breach of contract) I doubt there's any legal standing to bring a case. ...
  22. Replies
    18$$
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    624

    Guess we should have told that customer to get a...

    Guess we should have told that customer to get a home inspection.:lol:
  23. Replies
    17$$
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    1,474

    The lightning current has no particular desire to...

    The lightning current has no particular desire to go to the server room. It might go there because it is inclined to go everywhere it can. It might, or might not, send much more current through the...
  24. Replies
    18$$
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    624

    I'll add: these can suck. I saw one once that...

    I'll add: these can suck.

    I saw one once that was a 200A service. We needed to install a 7.6kW inverter which would normally be fine. But the service panel was split bus with two 100A sections...
  25. Replies
    18$$
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    624

    What guidance is needed? They are basically two...

    What guidance is needed? They are basically two panels in one. Apply the rules for whichever you want to connect to.
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