 nunyaWho is John Galt?Premium,MVM
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Re: A picture is worth 3 words... De-rating isn't anything new. It doesn't matter what state you are in, the laws of physics still apply. I think it's safe to say that it's been a code requirement for a long time. I would guess over 100 years.
FWIW, going back to 1962 (the earliest I could find) it looks like WI just takes the NEC and adds their own little pre-cursor to the front with some minor amendments.
Basically, it's called the the WI electrical code, but it's really just the same NEC that almost everywhere USA uses.
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| said by nunya:De-rating isn't anything new. It doesn't matter what state you are in, the laws of physics still apply. I think it's safe to say that it's been a code requirement for a long time. I would guess over 100 years.
FWIW, going back to 1962 (the earliest I could find) it looks like WI just takes the NEC and adds their own little pre-cursor to the front with some minor amendments.
Basically, it's called the the WI electrical code, but it's really just the same NEC that almost everywhere USA uses.
I should know by now that if I don't properly qualify and source my statements in this forum they will be refuted and rejected. 
You are right of course that derating has been around since the beginning of time. I was referring to a specific provision Wisconsin had (Comm 16.30) in 1999 which is what was relevant to my situation.
quote:
ARTICLE 310
CONDUCTORS FOR GENERAL WIRING
Comm 16.30 Ampacities for conductors rated
0-2000 volts [NEC 310-15].
(1) ADJUSTMENT FACTORS [NEC 310-15(b)(2)]. This is a department exception in addition to the exceptions specified in NEC 310-15(b)(2)(a):
Exception No. 5: The derating factors shown above do not apply
to branch circuits supplying an individual dwelling unit.
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