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Type: Posts; User: ggunn

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  1. Replies
    21$$
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    Ah. I had heard that the fault in the conduit was...

    Ah. I had heard that the fault in the conduit was the negative conductor, but I hadn't known it was a positively grounded system so I thought it was the first one. That said, grounded conductor...
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    21$$
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    I am not trying to be argumentative, but since...

    I am not trying to be argumentative, but since the two faults that caused the fire were between DC conductors and the conduit, what has whether the inverter was operating and whether it could have...
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    21$$
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    Even if the inverter would have faulted when the...

    Even if the inverter would have faulted when the negative conductor shorted to ground the fire still would have happened if no one went up on the roof to investigate the fault; the second fault took...
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    21$$
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    The GEC does not connect directly with any of the...

    The GEC does not connect directly with any of the DC conductors, it only connects the EGC to the electrode.

    The problem with the Bakersfield fire was that the faults that caused the fire created a...
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    21$$
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    In a PV system with grounded DC, the connection...

    In a PV system with grounded DC, the connection between the (usually) negative conductor and the EGC is made inside the inverter through its ground fault detection circuitry. Any connection you make...
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    21$$
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    Many single phase AC inverters can operate...

    Many single phase AC inverters can operate without a neutral connection. SMA transformer coupled inverters, for instance.
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    21$$
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    Perhaps I am misinterpreting what you have...

    Perhaps I am misinterpreting what you have written (and it has been a while since I have dealt with small inverters), but transformerless inverters require connection to the AC neutral conductor for...
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    21$$
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    1) not really; the inverter design supports one...

    1) not really; the inverter design supports one or the other
    2) yes
    3) no, transformerless inverters generally have ungrounded DC
    4) yes, see 1)
    5) I dunno; I don't have my code book.
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    42$$
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    Even better, some PV sales houses sell modules...

    Even better, some PV sales houses sell modules that have failed final inspection for one reason or other, and they are very cheap. They are electrically dead, of course (they probably don't have...
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    16$$
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    That is of course true, but I have wondered as...

    That is of course true, but I have wondered as well why it is that way. In a properly designed system the inverter is incapable of endangering the conductors; the OCPD is there to protect the...
  11. Thread: Code Violations

    by ggunn
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    36$$
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    You guys know that there is no such thing as...

    You guys know that there is no such thing as anonymity on the internet, right? Just checking... :D
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    Don't some gennies make DC and use an inverter to...

    Don't some gennies make DC and use an inverter to interconnect?
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    42$$
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    840

    The power of the module is irrelevant; it's the...

    The power of the module is irrelevant; it's the maximum current output of the inverter that matters.
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    42$$
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    I believe the issue was what the calculations...

    I believe the issue was what the calculations were before the 2014 Code. In the 2014 Code, as you say, the breaker ratings have been completely removed from the calculation. And there was great...
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    42$$
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    840

    Golddigger is correct. When the output of...

    Golddigger is correct. When the output of inverters is combined in a subpanel and fed into the main panel through another breaker, the 120% rule calculation in the main panel is based on the sum of...
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    42$$
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    I guess then the question becomes whether the AHJ...

    I guess then the question becomes whether the AHJ will allow him to do that if they haven't yet adopted the 2014 NEC.
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    42$$
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    The operation was a success and the patient died.

    The operation was a success and the patient died.
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    42$$
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    In a related story in the category of "Here, hold...

    In a related story in the category of "Here, hold my beer"...

    This is probably an Urban Legend, but the story goes that some guy had a fuse blow in his car (probably a beat up pickup truck) and he...
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    42$$
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    1,662

    If it's corner grounded and that wire is on the...

    If it's corner grounded and that wire is on the grounded phase, a fuse in that position would be superfluous, wouldn't it?
  20. A local theatre company bought a building but it...

    A local theatre company bought a building but it was a few months before they were ready to move into it, whereupon they found that thieves had stolen all the copper from the pole out front to the...
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    42$$
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    1,662

    With the right sort of stimulation applied to a...

    With the right sort of stimulation applied to a sensitive enough part of her anatomy, maybe so. :D
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    24$$
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    1,239

    On your marks, get set, INTERPOLATE! :D

    On your marks, get set, INTERPOLATE! :D
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    61$$
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    Anyone who has engaged in shade tree mechanics on...

    Anyone who has engaged in shade tree mechanics on older cars has probably learned the hard way not to lean on a car with a running engine with your crotchal area in contact with the fender, and reach...
  24. Does it produce .dwg files that AutoCAD can...

    Does it produce .dwg files that AutoCAD can open/edit?
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    24$$
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    I still have mine somewhere, by cracky!

    I still have mine somewhere, by cracky!
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