ARTICLE 310: Conductors for General Wiring

NEC Table 310.15(B)(2)(a)

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Table 310.15(B)(2)(a) Adjustment Factors for More Than Three Current-Carrying Conductors in a Raceway or Cable

Number of Current-Carrying Conductors Percent of Values in Tables 310.16 through 310.19 as Adjusted for Ambient Temperature if Necessary
4-6 80
7-9 70
10-20 50
21-30 45
31-40 40
40 and above 35

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