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  1. Thread: CT can

    by electrofelon
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    4$$
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    91

    ......Unless its like an LB's where (according to...

    ......Unless its like an LB's where (according to one manufacturer) you can calculate and use sizes and combinations other than the max as long as the overall KCMIL is the same or less. For...
  2. Thread: CT can

    by electrofelon
    Replies
    4$$
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    91

    Yeah I was going to say check to see if the CT...

    Yeah I was going to say check to see if the CT can gives any limits. Yeah though that is odd as that only gets you to 1900 with CU. Maybe contact the MFG for clarification?
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    50$$
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    See 230.90(A) Exception 3. I suppose that...

    See 230.90(A) Exception 3. I suppose that exception could be thought of as a "loophole" but I have never heard of any problems. In those cases the overload protection is provided by load calcs and...
  4. Replies
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    That does not appear to be the case based on the...

    That does not appear to be the case based on the PSE publication.
  5. Exactly!

    Exactly!
  6. Replies
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    Im still eagerly waiting for the article from...

    Im still eagerly waiting for the article from copper.org: "aluminum wire saves money" ;)
  7. Thread: CT can

    by electrofelon
    Replies
    4$$
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    91

    I think you can do it, although it doesnt sound...

    I think you can do it, although it doesnt sound like super happy fun time. You will have to double stack and stagger the bottom 6, 2 rows of 3, and get creative with strapping the outer row.
    ...
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    Hello OP?? Any updates or responses?

    Hello OP?? Any updates or responses?
  9. There was a good chart that has been posted here...

    There was a good chart that has been posted here in the past that shows current vs voltage for (typical) motors, however I cant find it.
  10. Replies
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    But that does not seem to be the case based on...

    But that does not seem to be the case based on the figures from that PSE manual I posted. Unless you actual mean "impedance" and not "%Z". IT seems not completely clear how to state %Z with a...
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    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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    451

    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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    451

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

    Take a look at this, page 27:
    ...
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    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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    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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    451

    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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    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?
  18. 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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    592

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

    Perhaps an experiment is in order......
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    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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    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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    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:
  23. 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
  24. Replies
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    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...
  25. 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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