BACKGROUND:According to the National Electrical Code, 12 gauge cable is approved for use on 20 amp circuits { NEC 2011 Table 240.4(D)(5) }, in ambient temperatures of up to 140?F { NEC 2011 Table 310.15(B)(16) amp; NEC 2011 Table 310.15(B)(2)(a) }However they are frequently run in attics, and home inspectors say that attics in the Dallas area frequently exceed 140?F.MY QUESTION:If a 20 amp circuit is being added to an area that frequently exceeds 140?F, what is required in order to meet code?
