Conductors located above an electric space-heated ceiling are considered to be operating in an ambient temperature of _____. a) 20°C b) 30°C c) 50°C d) 86°C See answer and applicable Code reference The correct answer is: c) 50°C Article 424 of the 2011 NEC focuses on fixed electric space-heating equipment. The rules for space-heating cables are outlined in Part V and the clearances of wiring in ceilings is noted in Sec. 424.36. The 50°C requirement is noted in ...

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