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  1. Replies
    6$$
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    192

    Best answer. :thumbsup: Anything listed as a...

    Best answer. :thumbsup: Anything listed as a 'surge' or 'peak' output is not continuous.

    I would just add that the 'nominal output current' for utility interactive inverters is pretty irrelevant...
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    24$$
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    610

    Man I wish people would do that.

    Man I wish people would do that.
  3. Replies
    18$$
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    433

    It's really not that big a dice roll because this...

    It's really not that big a dice roll because this is 70 year old technology and there are plenty of silicon panels that have been operating for 25 years (or more) in the open environment. So the 80%...
  4. Replies
    24$$
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    610

    I'm sorry. To facilitate moving around...

    I'm sorry.



    To facilitate moving around breakers when a new one needs to be added in a specific position, which is what I frequently need to to. (See 705.12(D))



    Thereby failing an...
  5. Replies
    24$$
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    610

    Now what would be a good typical practice, at...

    Now what would be a good typical practice, at least in today's panels that generally have space, is making the hot long enough to reach any breaker position in the panel. I don't think it warrants a...
  6. Replies
    18$$
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    433

    That's just not true. We're installing PV for a...

    That's just not true. We're installing PV for a projected cost of 11cents/kwh or less. In California no one pays less than about 14cents/kwh, and many people pay 30 or 40 cents for high usage. (In...
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    1$$
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    147

    Good stuff... Here are my opinions. (2014 code...

    Good stuff...
    Here are my opinions. (2014 code in MA, right?)

    1) Hard to say, but it would be a good idea. I'm even a little unclear if DC disconnects are required on the building with the...
  8. Replies
    16$$
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    431

    If the light switch is on and someone comes in...

    If the light switch is on and someone comes in after you and turns off the breaker for the wall plugs and starts working on them, he can be zapped by 110V from the neutral if he disconnects it at...
  9. Replies
    21$$
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    570

    Correct. At least that's the idea. It works...

    Correct. At least that's the idea. It works pretty well with an ungrounded conductor fault and sometimes also works with a grounded conductor fault.



    The fuse is the connection, and the...
  10. Replies
    21$$
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    570

    Your post is a little confusing...:p Is my fix...

    Your post is a little confusing...:p Is my fix in red correct?

    I agree that a conductor 'grounded' through a fuse is not typical of 'grounded conductors' and could be misleading. Hence the...
  11. Replies
    21$$
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    570

    So... to clarify.... I was speaking of the...

    So... to clarify....

    I was speaking of the connections to the distinct power-electronic inverter component(s) inside the device, not the 'inverter' as a engineered product comprising many...
  12. Replies
    21$$
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    570

    3) You have it backwards. A transformerless...

    3) You have it backwards. A transformerless inverter connects only to ungrounded AC conductors because connecting an grounded DC conductor to an ungrounded AC conductor (i.e. AC-hot to ground)...
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    16$$
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    451

    That's not an accident. If nominal voltage...

    That's not an accident. If nominal voltage around here were 250 instead of 240 then all would be perfect. 8-)

    But I completely agree with how annoying it is.
  14. Replies
    35$$
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    924

    If it is part of the premises wiring, then a...

    If it is part of the premises wiring, then a transformer secondary is a feeder according to the NEC, so there is no 'rather than' there to consider. I also agree with...



    The sizing of...
  15. Replies
    16$$
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    451

    Nuisance tripping can be a safety problem because...

    Nuisance tripping can be a safety problem because often the 'solution' is to upsize the breaker to something that's more than the ampacity of the wire. (I once surveyed a house with a 240V 10awg...
  16. (2) may occur just with temporary shading, so...

    (2) may occur just with temporary shading, so that might end up being a nuisance alarm for you. Probably a combination of (1) and (3) being best, with (3) being analyzed over a long period of time...
  17. Replies
    42$$
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    949

    With many meter/main combo service panels there...

    With many meter/main combo service panels there is no code compliant way to do a supply side connection that doesn't cost just as much as upgrading the panel. Also some AHJs don't allow supply side...
  18. Replies
    42$$
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    949

    Not really, since it can output 250W if the...

    Not really, since it can output 250W if the voltage is 250 or higher, which is possible and even likely at the end of a string.

    (Funny marketing sidenote: Previous Enphase inverters could actually...
  19. Replies
    42$$
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    949

    The OP had the math correct. And it's 125%...

    The OP had the math correct.

    And it's 125% of the rated (not actual) system output that goes into the 120% rule, so he still cannot connect load side.
  20. Replies
    42$$
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    949

    No, he's not doing the math properly, because...

    No, he's not doing the math properly, because he's forgetting the 125%. The rated output of an M250 is 1.0A, thus 33AX1.25 = 41.25A which the OP had correct to begin with. We really got...
  21. Thread: NEC or Not

    by jaggedben
    Replies
    5$$
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    329

    This article...

    This article seems relevant. It seems to imply, though, that you are not a utility.



    My guess is that it defined by the laws of the state you are in. Just a guess. I gather you've noticed...
  22. I don't agree that the code language is clear; I...

    I don't agree that the code language is clear; I think it's a matter of interpretation in any case.

    Furthermore, there's 90.4.
  23. Checking diodes before install is not something...

    Checking diodes before install is not something that I've seen heard anyone place any emphasis on. Since you have a thermographic camera (I assume that's an infrared type camera), you should use...
  24. FWIW, I don't think that condition 2 applies to...

    FWIW, I don't think that condition 2 applies to the OP's situation, since it's apparently not a system "in which the neutral conductor is used as a circuit conductor". In this case it seems there...
  25. Replies
    5$$
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    222

    It's not common in California. I'd say almost...

    It's not common in California. I'd say almost never done.
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