Reference 47514. What is the warmth rating of NMB3 house electrics?

this is oroiginal wiring contained by a 50 year old home. option to change lighting fixture to one which specifies electrics must be rated 90C


Answers:    NMB have a temperature rating of 90 degree C.
I concur with John Himself, article 336-30(3)(b) FPN states,NM-B meet the 90 degree c requirement.
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