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  1. Replies
    12$$
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    550

    That Google search turned out a large number of...

    That Google search turned out a large number of hits. Is there a specific article I should look for? If you can find it again, please copy the web address and post that on your next reply. Thanks.
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    OK. I have thought about it some more, and I...

    OK. I have thought about it some more, and I found one interesting tidbit. The master versions of the specs are published in such a way as to provide the occasional "note" intended to help the...
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    Thanks for the offerings. But I don't think we...

    Thanks for the offerings. But I don't think we have it yet. The only things to which the 4/0 is bonded are the ground wires that are installed on the inside walls of any manholes or vaults that are...
  4. Thread: 1200a feeder

    by charlie b
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    303

    No it doesn't. GFPE is required if the voltage...

    No it doesn't. GFPE is required if the voltage to ground is above 150V. A 120/208V system has a voltage to ground of 120V.
  5. Thread: 1200a feeder

    by charlie b
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    6$$
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    303

    Echoing Bob's point, I don't know of any rule...

    Echoing Bob's point, I don't know of any rule that says that any piece of electrical equipment has to be located in an "electrical room." But it is in such a room, then the rules for a second exit...
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    Yes. Code reference is article 100. The two...

    Yes. Code reference is article 100. The two disconnects to which you refer are not "SERVICE" disconnects, as that word is defined in article 100. So the prohibition of having more than one...
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    12$$
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    In the circles though which I run, 5" conduits...

    In the circles though which I run, 5" conduits are the norm. It is not calculated on a case-by-case basis to determine whether a smaller conduit would suffice.
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    12$$
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    Ground Wires and MV Ductbanks

    I have received a question from the field regarding a specification requirement they want me to delete. It was part of the boilerplate spec, meaning that I did not write it, and I did not elect to...
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    16$$
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    I believe you meant that a new SCCA is...

    I believe you meant that a new SCCA is established. See my post #8 above.
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    That is neither an SCCR nor an SCCA. That is an...

    That is neither an SCCR nor an SCCA. That is an AIC - an acronym that has several possible meanings. I prefer "Amps Interrupting Capability," but other choices are available. It refers to the...
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    I think you are using the term "SCCR"...

    I think you are using the term "SCCR" incorrectly, and it has me confused. There are two separate concepts that have a relationship with each other, but that are determined by very different means. ...
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    It has been a long time since I have had to...

    It has been a long time since I have had to calculate ampacity for duct banks. What I recall is that the N-M method that is built into my favorite software (AmpCalc) will always give you a lower...
  13. Thread: EGC sizing

    by charlie b
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    439

    That is what Rob said in his post #2. His post...

    That is what Rob said in his post #2. His post #5 is bringing 250.122(B) into play. If the conductors are sized for 1200 amps, and the OCPD is set to 1000 amps, then the conductors must have been...
  14. Thread: EGC sizing

    by charlie b
    Replies
    9$$
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    439

    The simple answer is that that "problem" belongs...

    The simple answer is that that "problem" belongs to the "somebody" who does the future revision. We don't have to design today for changes that someone else might make later.
  15. Thread: EGC sizing

    by charlie b
    Replies
    9$$
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    439

    Yea. What he said. :happyyes:

    Yea. What he said. :happyyes:
  16. I am closing this thread in accordance with forum...

    I am closing this thread in accordance with forum rules. This forum is intended for use by electricians and electrical contractors, inspectors, engineers, and vendors with their job-related duties. ...
  17. I would also ask for clarification regarding your...

    I would also ask for clarification regarding your phrase, "multi-family residential." Do you mean, by NEC definitions, "dwelling, multifamily"? In other words, is each of the units a "dwelling...
  18. The NEC will not answer your question regarding...

    The NEC will not answer your question regarding the requirement to upgrade anything, given that the service is being altered. That is up to local authorities.

    I would need a clearer notion of the...
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    16$$
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    I have always understood the taps to be on the...

    I have always understood the taps to be on the primary side. Thus, a tap of +2.5% would mean more windings on the primary, with no change to the number of secondary windings. The result would be a...
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    12$$
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    They're called "radiant heaters." It works the...

    They're called "radiant heaters." It works the same way the Sun does: it has little direct effect on the temperature of the air, but it makes you feel warm. The air temperature is impacted more by...
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    8$$
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    That article was published in 1957. It's a good...

    That article was published in 1957. It's a good bet that it did not include an Excel spreadsheet. :happyno:

    The difficulty that an EE would face in trying to use the Neher McGrath method to...
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    It all depends on what is under the floor of this...

    It all depends on what is under the floor of this room. If there is a crawl space below, then shifting the piping would be a simple task. But then, if the electrical rough in was done, but not the...
  23. Duplicate. Closed. The discussion is here:...

    Duplicate. Closed. The discussion is here:
    https://forums.mikeholt.com/showthread.php?t=198969
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    21$$
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    I didn't check your math. But your logic works...

    I didn't check your math. But your logic works for me. That is the reason the mechanical ratings are lower than our ratings (e.g., 460V motors on our 480V system).
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    I agree with Al on this one. Don't worry; I...

    I agree with Al on this one. Don't worry; I won't let it happen on a regular basis. :lol:
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