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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
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    The earth is a much, much larger conductor.

    The earth is a much, much larger conductor.
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    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...
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    Only for EGCs, see 408.41 already quoted above.

    Only for EGCs, see 408.41 already quoted above.
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    Interesting. But that would be a 'local...

    Interesting. But that would be a 'local ammendment' that has no basis in the NEC.
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    Huh? If the lighting bus qualifies for your...

    Huh? If the lighting bus qualifies for your backfeed then that's it, you're done.
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    (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...
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    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:
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    Good to know.:thumbsup:

    Good to know.:thumbsup:
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    I agree.

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

    Guess we should have told that customer to get a home inspection.:lol:
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    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...
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    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...
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    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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    After reiterating that all of this is...

    After reiterating that all of this is speculation, and may have no relevance to the actual incident...

    I can think of two reasons (other than pure incompetence) why someone might be driving a...
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    I haven't come across anything to like about it,...

    I haven't come across anything to like about it, as compared to the old one.
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    I've seen companies put confidentiality notices...

    I've seen companies put confidentiality notices on their bids and quotes but it doesn't seem to me that they are at all enforceable.
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    The one mistake I could imagine a PV contractor...

    The one mistake I could imagine a PV contractor making on a simple install is driving a ground rod in the wrong place. But I hasten to add that is 110% speculation on my part with respect to this...
  25. I think if you can verify that the utility bill...

    I think if you can verify that the utility bill is based on 15 minute interval data then you can use that to comply with 220.87. Regardless of code, it might be a good idea to get a years worth of...
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