temperature rating of wire for lights
When I replaced a hallway ceiling light with a new light fixture, I found that the insulation of the wire leads into the ceiling box were cracked (showing exposed metal) and discolored, apparently from overheating. The new light fixture had a warning label that said it should be connected to wires rated for 90C, and that most houses built before 1985 have wire rated for 60C. Is there any way I can check to find out if the wires in my house are rated for 60C or 90C (my house was built in 1979)? If they are rated for 60C, can I safely use the newer fluorescent bulbs (the ones that replace standard incandescent bulbs) in the ceiling lights, since the fluorescent bulbs supposedly run cooler (at least that's what I have read)? Many thanks for some advice on this.