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  1. Replies
    3$$
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    46

    Debateable. You'd probably have a better chance...

    Debateable. You'd probably have a better chance of this being approved if you use USE-2 or PV wire for conductors since those are allowed to be run exposed for PV in not-readily-accessible areas. ...
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    6$$
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    162

    i. ... means having a representative of UL or a...

    i. ... means having a representative of UL or a similar organization come out and perform a field inspection and certification. You pay them a lot (thousands) and it's a time consuming process,...
  3. I know for certain that I wouldn't buy anything...

    I know for certain that I wouldn't buy anything called an inverter that clearly did not contain an inverter.
  4. Replies
    6$$
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    183

    Applying the 120% rule on both sides of a...

    Applying the 120% rule on both sides of a transformer is something would be really open to interpretation within the code. What code cycle are you on?

    To me, it would be reasonable to calculate...
  5. Replies
    11$$
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    416

    We used tile hooks, same as for flat concrete...

    We used tile hooks, same as for flat concrete tile. We carefully cut slots for the tile hooks, similar to grinding tiles.

    On the ones I did the 'shingles' were actually stamped to imitate...
  6. Replies
    11$$
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    416

    To continue the digression... If it's like the...

    To continue the digression...
    If it's like the ones I've seen, there's no plywood underneath. So it's more than just replacing the shingles with comp.
  7. If you know the current and need to know the...

    If you know the current and need to know the required (non-derated) ampacity of the wire, then you divide.

    If you know the non-derated ampacity of the wire and need to know the derated ampacity,...
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    11$$
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    416

    PS: I don't believe 690.43 (A) or (C) can be...

    PS:

    I don't believe 690.43 (A) or (C) can be construed to require bonding shingles. There is simply no mention of any categories that would include shingles or roof surfaces. In fact, I don't...
  9. Replies
    11$$
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    416

    If I'm interpreting your description correctly,...

    If I'm interpreting your description correctly, I've done two installs on this type of roof. In neither case did the AHJ raise bonding of shingles as an issue.

    Regarding your three options:
    (1)...
  10. Replies
    10$$
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    483

    Wouldn't a 400kW array be a little beyond the...

    Wouldn't a 400kW array be a little beyond the Sunny Island's capabilities? I read that the Multi-cluster box maxes out at 12 inverters.



    SMA's system allows the generator to be turned off if...
  11. I just need to say that you should not try to do...

    I just need to say that you should not try to do this for any reason whatsoever, ground loop or otherwise. It would violate the manufacturer's warranty, and would probably be futile in any case...
  12. Replies
    5$$
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    248

    The 2014 code is the first code to explicitly...

    The 2014 code is the first code to explicitly address feeder taps. See 705.12(D)(2)(1). You are allowed to tap a feeder if the feeder is rated for the sum of the utility source breaker and 125% of...
  13. Yes. This. Wait, we've gone through two...

    Yes. This.



    Wait, we've gone through two threads and now you tell us the building has an LPS? Did I miss that before? :slaphead:

    My advice is to stop worrying about lightning so much, or...
  14. Replies
    63$$
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    1,160

    It's a start. See comments in previous post. ...

    It's a start. See comments in previous post.



    To me, this part seems appropriate for a short Informational Note.
  15. Replies
    63$$
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    1,160

    Well, I think it affects anything which uses the...

    Well, I think it affects anything which uses the term 'inverter output circuit current', which is to say that it affects both 705.12(D) and 705.60(B) and perhaps some other stuff.



    Well,...
  16. Replies
    63$$
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    1,160

    I don't agree with that. "Inverter output...

    I don't agree with that. "Inverter output circuit current" should be read as 'the current of the inverter output circuit'. 'Inverter output circuit' is a term defined consistently in more than...
  17. Replies
    63$$
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    1,160

    I really think that it should not be an amendment...

    I really think that it should not be an amendment or exception to any rule regarding interconnection in 705.12(D), and should be defined prior to the 125% requirement. Again, I'd rather it be part...
  18. I don't see a difference electrically between the...

    I don't see a difference electrically between the diagrams. In both cases your array is bonded to the EGC terminal of the inverter with a green wire so your groundfault protection should be...
  19. Replies
    63$$
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    1,160

    I'd be inclined to support that... But rather...

    I'd be inclined to support that... But rather than view it as a 'change for 3-phase systems', it might be better to define the method of calculation for any portion of an inverter output circuit...
  20. Replies
    20$$
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    780

    Yes, it depends where you live and what the...

    Yes, it depends where you live and what the policies of your state are.
  21. Replies
    63$$
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    1,160

    The EE's on this thread may be able to help you...

    The EE's on this thread may be able to help you understand it better, but I believe that vector math makes it not as simple as either of those. What I know about that stuff is from trying to...
  22. Around here I think that would be a fail. As...

    Around here I think that would be a fail.

    As for wondering about it, this is something where you can relatively easily measure the ohms and get an idea of how bad it is.
    I would guess that...
  23. Replies
    63$$
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    1,160

    I'd disagree with that. 705 is pretty clear...

    I'd disagree with that. 705 is pretty clear about connections to a 'busbar or conductor'. You count the breakers connected to each busbar individually regardless if it's split-phase or three-phase....
  24. (I know this thread has kinda moved on, but...) ...

    (I know this thread has kinda moved on, but...)

    I would like to see someone connect two ground rods to the earth in series. 8-)
  25. Replies
    10$$
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    483

    The solar is somewhat secondary to your issue...

    The solar is somewhat secondary to your issue here. What you need is fairly large scale storage, which is an emerging industry. You also need some extremely sophisticated controls.

    You...
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