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#47905 01/29/05 04:57 PM
Joined: Sep 2004
Posts: 86
N
Member
Does anybody know the thought behind the ul label on light fixtures requiring supply connections to be rated for at least 90 degrees? I know that it does not pertain to the wiring in the box mounted in the ceiling due to a code seminar I attended many many years ago but I do not remember the exact meaning for it. Does it apply to the wires connected to the sockets or what?
Thanks
Ron

#47906 01/29/05 06:40 PM
Joined: Jan 2005
Posts: 5,369
Likes: 1
Cat Servant
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The specification does, in fact, apply to the wires within the connection box.
When UL tests a fixture, temperature measurements are an important part of the testing. Where there might be a problem, UL will require that wires in the area be of a certain insulation, the fixture be marked "Not for use inside residences," etc.

Ordinary THHN qualifies as 90 degree wire, so there's not a problem. What do you do if the requirement is for, say, 105 degree wire? Well, you end up having another j-box a couple feet away, and running the expensive hi-temp wire those last few feet.


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