I know we've kicked this around a few times already, but I figure some new information is bound to show up sooner or later.
Is there anything on the market that will 'upgrade' the temperature rating of conductors? I'm referring to situations where a Fixture, sorry, Luminaire is being replaced and the wiring in the ceiling box is an older 60C or 75C type.
In 'Your Old Wiring' by David Shapiro he mentions (box on pg 292) that in his other book he describes "a specialty product for upgrading their ratings" (temperature ratings of conductors) Does anyone know what that would be?
Thanks! Would this be an AHJ approved method for installing a newer fixture to older 60C or 75C wiring?
Is this a heat-shrink type of thing? Or if not, what would keep it in place?
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[This message has been edited by Bill Addiss (edited 07-25-2003).]
Re: Can you upgrade wire to 90C ?#85642 07/26/0305:48 AM07/26/0305:48 AM
They send that type of sleeving in some lights I've installed. Its only been about 6 or 8 inches long so it barely covers the feeders. The stuff is about 1/4 to 3/8 inside dia. so it doesn't stay in place on #12. It does protect the wire in the lights I've been into afterwards.
Most installers throw it away
Re: Can you upgrade wire to 90C ?#85643 07/26/0304:01 PM07/26/0304:01 PM
In some cases, acrylic- or silicone-impregnated woven glass-fiber sleeving can be used to cover conductors in ceiling boxes where heat has hardened or cracked thermoplastic or thermoset wire insulation. Cover entire exposed/affected/damaged length of conductor, extending well past the point of undamaged material.
Bill, I've used it a few times, in an emergency, and every time, I wonder if it is a legitimate fix. I'm fairly comfortable with it though, it's inexpensive and it's good to have some on the truck, but it is indeed a second choice. It is not heat-shrinkable. Slip it on back to the jacket, and the wire-nuts will prevent it from coming off. It comes in a range of diameters. If you buy some, note that it is sized based on bare conductor gauge. If you want it to fit over NM cable with insulation, you'll need to order 2 or 3 wire sizes larger.
[This message has been edited by Redsy (edited 07-26-2003).]
Re: Can you upgrade wire to 90C ?#85645 07/26/0310:53 PM07/26/0310:53 PM
Yes, it would be nice to have an answer, but it seem like nobody wants to commit themselves.
Also, I would like to know if the requirement for 90C conductors is just a result of worst case testing conditions and is really not an issue in uninsulated cavities and spaces between floors. I have a feeling that is the case, (because of something I found years ago) but it would be nice to know for sure because many existing fixtures are identical to the ones sold now except for the warning label.
It just seems to me that this is a blanket cya situation for the lighting manufacturers and the 90C wiring would not be necessary in all cases. But because the warning does exist, the liability is passed on to the installer. Most customers don't want to hear that you won't change a simple fixture without replacing the wires. It just puts us in a bad position, it would be real nice to have more detailed information on the hazard itself and what legal options are available.
Re: Can you upgrade wire to 90C ?#85647 07/27/0311:10 AM07/27/0311:10 AM
It seems to me to be a CYA for the installer also at least in the case of when they are supplied by manufacturer for a particular light. Of course that doesn't really answer your question of when they are used to retrofit.
Re: Can you upgrade wire to 90C ?#85648 07/27/0311:26 AM07/27/0311:26 AM