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Existing wired glazing in existing healthcare

Question asked by mark1122 on Oct 25, 2018
Latest reply on Nov 3, 2018 by milt.werner

I run across quite a few wire glass light kits in 90 minutes stairwell doors that have no type of UL listing or markings on the frame or glass. Are the existing wired glass kits required to be labeled? There is mention of existing wired glass in ch. 8 of 101, which confusingly stated some type of exception which I'm trying to understand. Can anyone clear this up for me?