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  1. Replies
    4$$
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    79

    First of all, if you are dealing with a grid-tie...

    First of all, if you are dealing with a grid-tie PV solar system, with no battery backup, then it isn't a standby power supply.

    We typically talk about the the utility connection 'supplying' a...
  2. As with most transfer switch situations, I think...

    As with most transfer switch situations, I think there are two options...

    Option 1) Don't bond N to G at either source. Bond N to G at the transfer switch, and don't switch the neutral.
    ...
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    11$$
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    173

    You got it. Or, in other words, do both and...

    You got it.

    Or, in other words, do both and see which requires the larger conductor.
  4. I think you have to look at the justification for...

    I think you have to look at the justification for the 83% allowance on service conductors and feeders, which itself could be a source of argument.

    If the justification is essentially a load...
  5. Here's how I might do it: [New Section] ...

    Here's how I might do it:

    [New Section]
    705.11 Service Rating

    The rating of the service shall not be less than 125 percent of the total maximum output current ratings of all...
  6. This nails it, in my opinion. Kind of strange,...

    This nails it, in my opinion. Kind of strange, but it is what the code actually says.

    Good luck working with the AHJ on this. They are already wrong about the 120% rule so don't expect them to...
  7. Thread: 110.21(B)

    by jaggedben
    Replies
    11$$
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    947

    I get that, especially on residential systems...

    I get that, especially on residential systems without combiner boxes. If you're not a qualified person then you hardly need to know the system voltage, and having the info probably won't help you....
  8. Replies
    8$$
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    217

    I'll stand behind Golddigger's response. And...

    I'll stand behind Golddigger's response. And just add that sometimes between AHJ requirements and customer preference/economics I am essentially forced to violate the one-point principle. ...
  9. Or another option might be to do a load side tap,...

    Or another option might be to do a load side tap, perhaps in combination with downsizing the main. It depends a bit on the feeder and how your AHJ interprets the 120% rule. But say, as an example,...
  10. I've always looked at this sort of equipment as...

    I've always looked at this sort of equipment as not feasible for such a thing.

    Are you looking to tap between one of the existing meters and its breaker? Or are you looking to add a meter?

    If...
  11. Replies
    8$$
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    217

    If I understood Mike Holt's criticism of...

    If I understood Mike Holt's criticism of 690.47(D) correctly, his beef is as follows:
    - An auxiliary electrode in Article 250 is one that is permitted but not required. (Permitted, say, because the...
  12. Thread: 110.21(B)

    by jaggedben
    Replies
    11$$
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    947

    If it's outdoor I think the best system is metal...

    If it's outdoor I think the best system is metal placards that I mark the numbers on with a punch set.

    It's worth noting that none of the required signs that need customizing (namely 690.52,...
  13. Replies
    8$$
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    217

    I remember that thread, sort of, but I'm not...

    I remember that thread, sort of, but I'm not going to dig it up. :roll:

    I'm no expert on lightning, and my primary comment is that if one is serious about lightning protection then that is way...
  14. Replies
    15$$
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    351

    Which is what I said in post #2. (BTW I said...

    Which is what I said in post #2. (BTW I said 1000V system voltage, by which I meant up to 1000V. Hope that was obvious).
    And it also may depend on the module short current spec, because the...
  15. Replies
    15$$
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    351

    Practically speaking, that's probably only going...

    Practically speaking, that's probably only going to be possible with 1000V system voltage and the right panel specs. But sure.



    No. That's the whole point and meaning of having a separate...
  16. Replies
    24$$
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    485

    We do it all the time on solar arrays.

    We do it all the time on solar arrays.
  17. Replies
    24$$
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    485

    I'm definitely inferring it. Nobody is forcing...

    I'm definitely inferring it. Nobody is forcing you to, though. :lol:

    BTW, I believe a corollary to this discussion is that the EGC insulation does not need to be 'sunlight resistant' even if...
  18. Replies
    9$$
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    290

    Grounding a conductor is done to provide a...

    Grounding a conductor is done to provide a low-impedance fault path to open fuses or circuit breakers if there is an fault from the other conductor(s) to ground or to grounded parts. So it's a basic...
  19. Well if it's a 200A service then it would allow...

    Well if it's a 200A service then it would allow 100A.
    And if it's a 125A busbar with a 100A main breaker (quite common), then it would allow 88A, which is awfully close to 100.

    If the rule were...
  20. Replies
    9$$
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    290

    I would bet that if you found neutral and ground...

    I would bet that if you found neutral and ground connected together in all those places then that's how it is supposed to be done in Thailand. From your description it sounds like possibly the N-G...
  21. Replies
    16$$
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    404

    See 705.65(B), Exception. Maybe I need to read...

    See 705.65(B), Exception. Maybe I need to read it a couple more times to make sure I'm really reading it right, but I think it says you don't need OCPD there if you're numbers work out.
  22. So glad to hear that. :happyyes:

    So glad to hear that. :happyyes:
  23. We always transition. I've seen it done...

    We always transition.

    I've seen it done otherwise but I don't see it saving much time and expense. Especially with more than one circuit. It gets ridiculous to pull more than a couple PV wire...
  24. Replies
    4$$
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    234

    There are 10 options listed in 690.17 and the...

    There are 10 options listed in 690.17 and the last five are not PV listed items. So I'm not sure why you seem to feel that your options are limited.

    The only thing I can add is that this section...
  25. Replies
    6$$
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    227

    705.95(B)

    705.95(B)
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