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Type: Posts; User: cppoly

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  1. Replies
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    Thanks, but the tap rule for

    Thanks, but the tap rule for <10' indicates the tap conductors need to be sized at 1/10th of the feeder OCPD right? 2,000A OCPD would be 200 amp minimum conductor ampacity.
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    2$$
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    Tap rule for jockey pump

    What do you do when running a feeder to serve a very large HP fire pump with a small jockey pump where the jockey pump conductors are tapped from this feeder? For instance, if you have a 2000 amp...
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    Thanks!

    Thanks!
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    Are power strips a code violation in NYC?

    Just curious
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    Thanks guys

    Thanks guys
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    Transformer secondary conductor ground

    Just a recap because I always keep forgetting.

    Transformer primary ground is sized on OCPD
    Transformer grounding electric conductor is sized on the largest conductors

    How is the transformer...
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    Thanks

    Thanks
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    Thanks, I should have kept reading the section...

    Thanks, I should have kept reading the section but there is a section for <25' secondary conductors.

    But, does anyone have the 2014 NEC handbook? Transformer section 240.21(C)(2) commentary gives...
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    Fused disconnect for xfmr secondary > 10' ?

    Is a fused disconnect required if transformer secondary conductors are over 10 feet?
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    Thanks, are you required to size secondary...

    Thanks, are you required to size secondary conductors and OCPD to the LOAD or the full rating of the transformer?
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    Transformer primary & secondary OCPD

    If you decide to use both, there’s nothing wrong with putting 125% on both right? Not sure what the purpose would be to put 250% on the primary and 125% on the secondary, just seems more intuitive...
  12. Thanks guys. But can I push back a little, if...

    Thanks guys.

    But can I push back a little, if conductors pass through a core drill through concrete why would the conductors not have physical protection? Stupid question, it's not like the...
  13. Ok thanks!

    Ok thanks!
  14. Thanks that's a good point relating to fire...

    Thanks that's a good point relating to fire stopping requirements. But aside from that, does the NEC require low voltage or fire alarm cables to be protected with a pipe sleeve when passing through...
  15. Are pipe sleeves required for low voltage cabling passing through slab?

    OR can these cables simply pass through a core drill and just be surrounded by fire stop?
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    4$$
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    407

    I always find myself coming back to this point a...

    I always find myself coming back to this point a lot with the NEC. But I have to pushback a little on this, if a transformer is at risk of overheating because of not accounting for 125% of...
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    From what I’m interpreting in 110.26(D) “shall...

    From what I’m interpreting in 110.26(D) “shall not be controlled by automatic means only”. It sounds like an occupancy sensor would be allowed if there’s a pushbutton (manual control) on the sensor...
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    Thanks. Next question would be why it is...

    Thanks.

    Next question would be why it is this way. Would be helpful to know.
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    THHN / THWN wire temperature rating

    THHN is rated for 90 degree C and THWN is rated for 75 degree C but both of these ratings can be listed on the same wire. Just want to make sure I have this right, if installed indoors you can use...
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    Great point about temperature relying on certain...

    Great point about temperature relying on certain conditions, I agree with that.

    Although going back to Mike’s example. Practical application would be let’s say let's assume 50 to 100 foot branch...
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    8$$
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    Going through a Mike Holt example, does Mike have...

    Going through a Mike Holt example, does Mike have this wrong here?

    In the example, it says the ampacity of the wire increases because of 50 degree ambient temperature. But the example shows a...
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    So does it look like a #8 is required for the...

    So does it look like a #8 is required for the neutral even if using #12 hot?
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    Yup exactly.. just need help finding this in the...

    Yup exactly.. just need help finding this in the code because from what I can find it points to a minimum #8 grounded conductor.
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    Sizing neutral for 30 amp service disconnect

    230.42 gives minimum conductor sizing requirements and for the neutral, section 230.42(C) refers you to 250.24(C).

    250.24(C)(1) says then refers to you to table 250.102(C)(1) to size the neutral....
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    Thanks. I totally agree with this as it seems...

    Thanks. I totally agree with this as it seems like the most likely used application to the rule. And the 10 ft part makes a lot of sense here.

    Just have to accept the rule and not try to...
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