It has consistently been a contention of mine that where a manufacturer of a Listed luminaire or fan/light requires 90C conductor terminations, that the wiring in that box (the point of termination) be 90c rated. This topic for all intensive purposes is a real "110.3" issue and a 410 Listing and Labeling topic. I would like to know how others feel about this. Listing drives a lot of interpretation and puts teeth in actual articles not left to examination or interpretation. Antiquated cloth and TW insulation drives this thinking of mine and I am a believer that that is probably one of the main reasons for the Luminaire Labeling containing a 90C tag. FIRE AWAY PEOPLES!
I guess I would say that as an inspector, I'm looking for something that says that this luminaire must be connected to a circuit with 90° C conductors and if it doesn't say that, case closed. If it says "to be terminated on a 90° conductor" than thats what I look for on the inspection. The problem usually is that electricians are connecting luminaries that specify 90° C fixtures wires are to be connected to 90° branch circuit wiring and the branch circuit wiring is a conductor with 60° insulation rating. Quite often these luminaire replacements never get inspected.
The issue is really the amount of heat that the luminaire ports back into the box. Like many things, the owner of a house with old wire is probably going to have to spend more money for a luminaire that handles the heat better and does not require the 90c wire.
I also agree if the HO buys one and puts it up himself, we will never know. I would like to trust that a licensed electrician would respect his craft (or fear a lawyer) enough not to do it.
I ordinarily try to prompt installers of these requirements ahead of time as best we can given that luminaries are not always on the site for the rough, in which case, in an earnest effort to avoid taking fixtures down on a final, we try to prompt electricians on a rough of these requirements. Working off NEC 2002 in our jurisdiction the conversation may go to the condition of the conductors. The intent is present by 110.3 and later cycles have 410.74 to reinforce the requirement. I still occasionally, have a debate about 60c and cloth wire being in the same box on my hands or pig-tailed over from the old conductors to the fixture wires in a ceiling box or sconce. I don't believe this is the intent of stating 90c terminations required when the conductors are intermingled and packed in the same box. Consistent, but sometimes questioned interpretation. (Often enough, there are other issues with the 60C and cloth wire at a given box where a 90C wiring termination is to be made that will dictate abating the older wire, such as, antiquation of insulation, length of conductors out of a box and box fill. I have not thoroughly viewed the history of the 90C requirements in Listings' of Luminaires, but my feeling it is somewhat manufacturer and insurance driven due to liabilities involved with older conductor and terminations to their equipment.) Thanks for posting a response! I do agree fully that if a new fixture does not have a termination temperature requirement comment of yours as well.
In some instances I have suggested just getting those conductors out of that box and making the splice to an older circuit back in a switch prior to the Luminaire's box, this is consistent with getting all the cloth or 60C wire out of an outlet where a 90c termination is required. Does anyone else feel this is a viable solution in smaller scopes of work. (I generally encourage electricians to consider discussing replacing older circuits fully, with an "HO" if there are issues as such with adding load or re-energizing older conductors in the name of safety.)
If you want the most controversial, you knock the box out, splice a piece of NM-b to the NM with a Tyco splice kit, shove it up in the ceiling and put in an old work box.
That will start a fist fight at an inspector meeting.
334.40(B) Devices of Insulating Material. Switch, outlet, and tap devices of insulating material shall be permitted to be used without boxes in exposed cable wiring and for rewiring in existing buildings where the cable is concealed and fished. Openings in such devices shall form a close fit around the outer covering of the cable, and the device shall fully enclose the part of the cable from which any part of the covering has been removed. Where connections to conductors are by binding-screw terminals, there shall be available as many terminals as conductors.
I am on board with the "heating in the box" and the "cooked wire" issues that happen in a box, I am missing the 334.40 (B) reference with regard to the ability to terminate a 90 C required termination to a cloth wire. Can you explain George?... anyone please feel free.