400.5 Ampacity of Flexible Cords
New rule requires conductor ampacity correction when flexible cords are used in an ambient temperature above 86°F.
Tables 400.5(A) and 400.5(B) list the allowable ampacity for copper conductors in flexible cords with not more than three current-carrying conductors.
Where the ambient temperature exceeds 86°F, the flexible cord ampacity as listed in Table 400.5(A) or 400.5(B) must be adjusted by using the temperature correction factors listed in Table 310.16. Figure 400-1
Temperature rating for flexible cords are not contained in the NEC, but UL listing standards state that flexible cords are rated for 60°C unless marked otherwise.
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