• Wiring Above Heated Ceilings

    Ambient temperature operating requirements for wiring serving fixed electric space-heating equipment
    March 12, 2014

    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 this Section.

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