Why can't loose fiberglass contact non-IC rated recessed light?


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I have loose (blown-in) fiberglass in my attic. If fiberglass is noncombustible, why then is not allowed to contact a non-IC rated recessed light?
 
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Glass fibre is a very good thermal insulator. The lights need to be able to get rid of waste heat to stop overheating and possible fires.
 
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If your light has a "Non IC" listing, it cannot be covered with insulation. It's not the heat on the fiber glass that's the problem. Non IC lights normally have a thermal fuse in them. If the heat internal to the lamp get's high enough the link will open and the light will shut off until it cools down.
 

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