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  1. Thread: blowing bulbs

    by ggunn
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    17$$
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    353

    It's not noticeable in incandescents more for the...

    It's not noticeable in incandescents more for the second reason than the first. The heat inertia of an incandescent filament is high enough that the difference in its temperature (and therefore its...
  2. There are three answers to that question. First,...

    There are three answers to that question. First, of course the MSRP of an item is determined at least in part by what the market will bear.

    But second, without any knowledge of what the...
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    We went through all these scenarios in that other...

    We went through all these scenarios in that other thread. The readings as they are reported cannot be correct.
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    No matter how you split up the backfed breakers...

    No matter how you split up the backfed breakers you have a problem. If the main panel has 200A busbars and a 200A main breaker, you can only put 40A of backfed breakers into it irrespective of...
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    All I meant was that it doesn't make sense to run...

    All I meant was that it doesn't make sense to run a neutral out from an AC combiner if none of the inverters use it. It would just be a conductor to nowhere.
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    Followup: Unless, of course, none of the...

    Followup: Unless, of course, none of the inverters touched the neutral.
  7. Sure; all they have to do is sell their products...

    Sure; all they have to do is sell their products for less than it costs to make them. But they can make it up in volume, right? :D
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    I am having a deja vu...

    I am having a deja vu...
  9. Replies
    77$$
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    They are related, certainly. If the grounding...

    They are related, certainly. If the grounding conductor does not run from the switch back to the service, then of course the neutral needs to be bonded to it at the switch, but if the grounding...
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    18$$
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    If I were feeding a three phase AC combiner with...

    If I were feeding a three phase AC combiner with an array of single phase inverters, I would run a full sized neutral from the panel to the service.
  11. FWIW, standby plants are very rarely diesel and...

    FWIW, standby plants are very rarely diesel and never AFAIK coal. Virtually all are are natural gas powered.
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    I see. That's another issue. Does everyone agree...

    I see. That's another issue. Does everyone agree with that? I'll hang up and listen...
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    I'm sorry but I'm still not getting it; let me...

    I'm sorry but I'm still not getting it; let me try another tack. Let's play "what's wrong with this picture?"

    Let's say I have to design a PV system too large to interconnect via a backfed...
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    That is one statement with which I agree...

    That is one statement with which I agree wholeheartedly.
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    77$$
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    From post #34:...

    From post #34:
    ========================================================
    You said:
    As such, there is no need to bond the GES via a GEC or GEC tap to the grounded conductor (neutral). The GES is...
  16. Thread: NEC 120% Rule

    by ggunn
    Replies
    3$$
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    176

    That is correct. It must be installed at the...

    That is correct. It must be installed at the opposite end of the panel busbar from the main breaker. You can put up to a 25A breaker anywhere on the busbar you want but anything bigger than that must...
  17. I have seen that on commercial buildings as well.

    I have seen that on commercial buildings as well.
  18. For some definitions of "large", I guess. Most...

    For some definitions of "large", I guess. Most residential PV systems will never backfeed as much power at any given time as the home's peak usage is when the PV is not operating, and almost never...
  19. Replies
    77$$
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    Not according to my AHJ. They say that their...

    Not according to my AHJ. They say that their metering must have the neutral to function correctly whether or not the inverter is using it.

    But whether it is the AHJ or you who is misunderstanding...
  20. Replies
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    Some AHJ's require a full sized neutral through...

    Some AHJ's require a full sized neutral through the disco and PV meter irrespective of whether or not the inverter uses it.
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    Why couldn't the NEC just say how a PV disco to a...

    Why couldn't the NEC just say how a PV disco to a line side tap should be configured rather than depend on a chain of logic that is subject to interpretation? Or would that just make too much sense? ...
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    I'm sorry if this has been covered already and I...

    I'm sorry if this has been covered already and I am not just trying to be argumentative, but can you direct me to language in the NEC which directs that the neutral shall be tied to the enclosure. I...
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    You said: As such, there is no need to bond the...

    You said:
    As such, there is no need to bond the GES via a GEC or GEC tap to the grounded conductor (neutral). The GES is already bonded to the service neutral at another point or points, and the...
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    Neutral to enclosure?

    Neutral to enclosure?
  25. Replies
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    I just want to say that the last few posts have...

    I just want to say that the last few posts have reinforced my point quite well. The NEC should (IMNSHO) unambiguously direct which way this should be done. Having to make this decision based on...
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