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Author Topic: !970 [Maybe 1950s?] House. No Grounds.  (Read 4886 times)

Jonathan Johnson

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Re: !970 [Maybe 1950s?] House. No Grounds.
« Reply #50 on: August 16, 2018, 11:01:18 am »

Beg all you want but the NEC (2017ed) makes no mention of conduit/raceway size when calculating derating.  Table 310.15(B)(3)(a) only makes mention of the number of current carrying conductors.  You also are supposed to take into consideration ambient temperature.  In a residential basement it's unlikely to have an ambient temp requiring additional derating.

I think it is more about bundling than it is about raceway size.
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Stop confusing the issue with facts and logic!

Bob Leonard

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Re: !970 [Maybe 1950s?] House. No Grounds.
« Reply #51 on: August 16, 2018, 04:27:14 pm »

Beg all you want but the NEC (2017ed) makes no mention of conduit/raceway size when calculating derating.  Table 310.15(B)(3)(a) only makes mention of the number of current carrying conductors.  You also are supposed to take into consideration ambient temperature.  In a residential basement it's unlikely to have an ambient temp requiring additional derating.

Erik,
In all honesty, who gives a shit. Quote current spec all you want. The house was here before you and I were born, the wiring was done and inspected long before you were born, and I'm sure it will be here long after we're both gone. Give a rest son. There has to another book on your shelf.
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BOSTON STRONG........
Proud Vietnam Veteran

I did a gig for Otis Elevator once. Like every job, it had it's ups and downs.

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Re: !970 [Maybe 1950s?] House. No Grounds.
« Reply #51 on: August 16, 2018, 04:27:14 pm »


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