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  1. Replies
    17$$
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    359

    That is along the lines of what I was thinking...

    That is along the lines of what I was thinking but not knowledgeable enough on the terminology to put it into words.

    It also helps to recall what exactly %Z means: It is percent of primary...
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    17$$
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    359

    Gar, The document I linked to, as well as the...

    Gar, The document I linked to, as well as the one Ron linked to, both show L-N faults about 50% higher than L-L. Also you may look at this from cooper/bussman, see pages 237-239:
    ...
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    17$$
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    359

    Take a look at this, page 27: ...

    Take a look at this, page 27:
    ...
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    17$$
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    359

    I used the term "split phase" instead of "center...

    I used the term "split phase" instead of "center tapped" because I dont know if the construction method of the transformer effects the L-N fault current. There are two winding transformers that can...
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    17$$
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    359

    Also, in case you were not aware, keep in mind...

    Also, in case you were not aware, keep in mind L-N faults can be 50% higher than L-L faults on split phase transformers. I was alerted to this recently via PM when I was throwing out values based on...
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    17$$
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    359

    In my experience, 1.7 to 2.4 is typical. I can't...

    In my experience, 1.7 to 2.4 is typical. I can't imagine you will find one near 1.1
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    19$$
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    586

    In those cases had the neutral failed...

    In those cases had the neutral failed substantially or completely, or just failed a megger test but was still working?
  8. The qualification is if a "majority of the load"...

    The qualification is if a "majority of the load" is non linear. Unfortunately, the code seems to be black and white on it: there doesnt seem to be any allowance for "how non linear" those loads are....
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    19$$
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    586

    Perhaps an experiment is in order......

    Perhaps an experiment is in order......
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    19$$
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    586

    interesting, well your experience blows my theory...

    interesting, well your experience blows my theory out of the water. Ive seen a bunch of direct bury failures in my career, but only a few that I got to see the problem. Of those, I dont recall...
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    19$$
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    586

    grounded direct bury aluminum conductors

    Do you think grounded conductors are much less prone to failure than ungrounded ones? Have you even seen a failed direct buried aluminum grounded conductor? I always assumed ungrounded conductors...
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    10$$
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    541

    Well there is clearly a contradiction in the NEC....

    Well there is clearly a contradiction in the NEC. 310.15(B)(7) tells us NOT to bring ramen above 60 degrees, but the instructions on the package say to go above 60 (110.3(B)) :rant:
  13. I am sorry, that is not a valid argument. You...

    I am sorry, that is not a valid argument. You have not provided any evidence to back up your assertion. The snickers bar as been shown to be beneficial :D
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    9$$
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    436

    A few questions: 1. The transformer closest...

    A few questions:

    1. The transformer closest to the utility, you didnt specific the winding configuration.

    2. I assume the 480 stuff has GFPE. Is it tripping on GFPE or magnetic? What...
  15. But that is kinda like the "Snickers bar"...

    But that is kinda like the "Snickers bar" argument: I put a Snickers bar on top of every box on rough in, someone says that is stupid, then I say " well prove to me it's not beneficial."
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    21$$
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    1,107

    I must have missed the part in there, with all...

    I must have missed the part in there, with all the talk of saving money, where they say "using aluminum conductors can offer a big savings over copper." :lol:
  17. LOL no. What they have done is cost electricians...

    LOL no. What they have done is cost electricians and homeowners lots of capital that could have been used for other safety improvements that actually are effective so they have really cost lives.
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    193$$
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    3,598

    How long have you been on this forum? Its what...

    How long have you been on this forum? Its what we do here is come up with the most bizarre and unlikely things to debate and prove how poorly worded the code is ;)
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    193$$
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    3,598

    I admit I have never thought of this, nor ever...

    I admit I have never thought of this, nor ever heard of the interpretation/philosophy of MWBC's being exempt from AFCI, but see the ambiguity now. Consider a NEMA 14-20 recep (as someone mentioned a...
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    10$$
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    541

    Right, and it only works with mc, se (maybe), and...

    Right, and it only works with mc, se (maybe), and pipe and wire, not ramen which is restricted to 60 degrees.
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    10$$
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    541

    It's not in 440, it's in 240.4 as Rob said. I...

    It's not in 440, it's in 240.4 as Rob said. I prefer to think about it this way: the ampacity charts show 35 amps, so why would you be restricted to 30? That small conductor rule, #14=15 amps,...
  22. Try measurement again, perhaps with a different...

    Try measurement again, perhaps with a different meter?
  23. great video. That scenario is an example of them...

    great video. That scenario is an example of them being for the future as a disconnecting means, not put in as a repair (although they might also use one for the repair).
  24. Ok this is starting to make sense. So basically...

    Ok this is starting to make sense. So basically they are not installed "for the future" they were installed for repair and "left in place".
  25. Ahh ok. Why might they be installed? Seems like...

    Ahh ok. Why might they be installed? Seems like they would be killing a lot of customers if they were opened.
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