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  1. Replies
    1$$
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    104

    Yes, if by "100 amp main service" you mean the...

    Yes, if by "100 amp main service" you mean the OCPD associated with the service disconnecting means is rated 100A.
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    7$$
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    110

    I considered that premise, but nothing really...

    I considered that premise, but nothing really says you can't calculate the service/feeder load at the higher value.
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    7$$
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    110

    I agree that you can. The question is will you?...

    I agree that you can. The question is will you?

    I don't find it odd because the service/feeder load calculation would not end up less than the branch circuit load sum. I'd find it odd if it were...
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    8$$
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    153

    I second using of duct seal.

    I second using of duct seal.
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    48$$
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    922

    Hmmm... po ta to po tah to :p 110.14(C)...

    Hmmm...

    po ta to
    po tah to

    :p

    110.14(C) doesn't say the circuit ampacity is limited to the terminal temperature limitation. Only 310.15(B) says that.
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    5$$
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    153

    Essentially correct, but going to add some notes...

    Essentially correct, but going to add some notes for clarification.

    GEC's can be connected at any point along the service entrance neutral conductor. FWIW, some POCO's prohibit connections in the...
  7. Replies
    48$$
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    922

    No need to bow out. ;) Your assessment is...

    No need to bow out. ;)

    Your assessment is correct (see my reply to David).

    An indirectly associated matter which I question is circuit rating being based on the OCPD rating (210.3), when the...
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    48$$
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    922

    Okay... I've been having a hopefully momentary...

    Okay... I've been having a hopefully momentary lapse of reasoning today, and needed the reassurance. Thank you for your assistance in that regard. :happyyes:

    When I answered...

    ...I was...
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    5$$
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    153

    Yes, but it will not be the service disconnecting...

    Yes, but it will not be the service disconnecting means, so you cannot land any GEC's there, nor can the neutral and grounding conductors, buses, enclosure be bonded.
  10. Replies
    48$$
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    922

    But the conductor's [actual] ampacity is 75A.

    But the conductor's [actual] ampacity is 75A.
  11. Replies
    48$$
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    922

    As electrofelon asked me, are you sure? (IMO)...

    As electrofelon asked me, are you sure?

    (IMO) Breaker rating has no bearing on meeting the terminal temperature limitation. That is solely determined by load (NC+125%C). In the example...
  12. Replies
    8$$
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    202

    Depends on how you want to run it. Note in my...

    Depends on how you want to run it. Note in my first reply both cable tray methods have an ampacity over 650A. And the two conduit method has an ampacity over 600A. 240.4(B) permits the next higher...
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    48$$
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    922

    No to one of 'em. :angel:

    No to one of 'em. :angel:
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    8$$
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    202

    Correct. But I now have to throw in the 'bone...

    Correct.

    But I now have to throw in the 'bone us'. You have to do the actual ampacity calculation because the conductor must be protected at its ampacity by the OCPD (breaker/fuse). That's why my...
  15. No and yes, respectively.

    No and yes, respectively.
  16. Replies
    9$$
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    139

    You could have reduced that to: ...

    You could have reduced that to:

    (600*240*3)/(480*1.732)=519.6A

    :)
  17. Replies
    8$$
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    202

    Factoring continuous 125% is for determining...

    Factoring continuous 125% is for determining minimum SIZE conductor. You do not factor continuous when sizing for AMPACITY.


    Even if the equipment has 90°C terminations, it is quite likely the...
  18. Replies
    8$$
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    202

    Assuming copper, 75°C terminations, 90°C rated...

    Assuming copper, 75°C terminations, 90°C rated conductors...

    SIZE:
    Parallel... 520A × 125% = 650A... ÷ 2 = 325A... 2 sets 400kcmil @ 75°C, 335A each, minimum.

    AMPACITY:

    (1) Conduit... 520A...
  19. Replies
    1$$
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    84

    If you're doing this offset with a hydraulic...

    If you're doing this offset with a hydraulic bender, which, and what is the shoe's bend radius?

    Each bender will have minimum adjacent straight section requirements, e.g. distance to hook-end or...
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    8$$
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    180

    Works for me to say it's a violation. :happyyes:

    Works for me to say it's a violation. :happyyes:
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    8$$
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    180

    Hmm... sounds like the mobile home has a split...

    Hmm... sounds like the mobile home has a split bus panel... which means it's not parallel fed. Make any difference?
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    4$$
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    121

    I was thinking .85 being a more reasonable...

    I was thinking .85 being a more reasonable estimate, but I have no solid basis, just a SWAG.

    Is there a purpose?
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    9$$
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    139

    Doesn't change anything.

    Doesn't change anything.
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    19$$
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    315

    Shouldn't as long as it is solidly connected to...

    Shouldn't as long as it is solidly connected to the power supply grounding conductor.
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    9$$
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    139

    Yes (Sorry I edited my post but it amounts to...

    Yes

    (Sorry I edited my post but it amounts to same info)
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