Does anybody know if there is a way to check what temperature an aluminum
cable is rated for? The cable is 12 AWG NM aluminum. It doesn't give a
temperature on the sheathing, but it does say 600 V.
Yeah, I got a new lamp and it says warning 'min 90C supply conductor'. I
did a google search and the only thing I could come up with was for 14
Thanks for any help.
oh, yeah, since I'm asking, is it true that I don't need any special wire
nuts or connectors for this? I know it's required for connecting supply
cables e.g. 12 Al to 14 Cu. Perhaps it's a dumb question, but I thought
I'd double check.
This is not correct. The *cable* is rated at 60C, but the conductors
themselves are 90C:
"Conductors shall be rated at 90 C. The ampacity of Types NM and NMC cable
shall be that of 60 C conductors..." [1993 NEC, Article 336-26]
email@example.com (Doug Miller) wrote in
Really? I was told the expansion of larger and smaller wire gauges
wasn't such a big deal.
Anyway, assuming my supply wires are NOT 90C rated, can I pigtail the
aluminum wires to some NM-B (or other 90C rated cable) with the
ridiculously expensive Al-Cu wire nuts and anti-oxidant compound? Would
that satisfy the temperature rating? How long should the pigtails be?
What exactly are you connecting to; wires leads coming out of the
fixtures, or terminal screws?
Assuming it's wire leads, I'd probably squirt deoxidizer paste into a
wirenut and fasten it on the AL wire and the fixture wires really tight.
It's a light fixture, not a receptacle; the current is limited by the
lamp to about 1 amp. (could be more, could be a lot less, but it's not
gonna be 15A)
If it's terminal screws that are not rated for AL wire, I'd do that
copper pigtail thing. Six inches, or whatever length is easy to work with.
If you end up pigtailing and the 60c is in the same box as the fixture base you
haven't really fixed anything. They are just covering their ass for people who
don't believe the "60w max" warning. Is the insulation baked?
If you are just pigtailing with purple wirenuts I would skip it and hook up he
fixture directly with a purple.
The fixture is a 22 W fluoresent with a circline T-9(?) bulb. It says to
use only 90C supply wiring.
Incidently, the wiring on the old fixture (which was ancient and I assume
rated for the wiring) was rather crusty looking.
I don't know, maybe I'll just return it and get something that isn't so
yeah that's what I thought (22W), but I went ahead and picked up a couple
different fixtures just to have an alternative. None of them said anything
on the box about wiring temperature, but on the inside of one it said the
minimum temp was 85C (as opposed to 90C) as if to taunt me. The other one
has a warning in the install instructions (homes before 1985 have 60C
wiring blah blah) but doesn't say the fixture has any special requirements
(and the fixture doesn't have a sticker or anything) so hopefully it
actually doesn't and not they forgot to label it.
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