This article was posted 04/20/2007 and is most likely outdated.

Article 400 Flexible Cords - 400.5
 

 
Subject - Article 400 Flexible Cords - 400.5

April 20, 2007  

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Flexible Cords

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

Author’s Comment: 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.


Figure 400-1
(Click on image to enlarge)

       
 
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Comments

  • I understand the need for temperature correction factors. What I am unclear on are correction factors for the number of "current carrying conductors". Does this include the ground conductor(s)? Or any control conductors that might be included in a multi conductor flexible cord? For example: A submersible pump fitted with a cable composed of five 10 AWG conductors ( 3 phases,ground and ground check)and two 14 AWG control conductors for the 120v thermal cut-out circuit. It seems to me that the term "current carrying conductors" is kind of a gray area

    Mark Prairie
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