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NEC 2014: Table 310.15(B)(3)(a)


Adj Factors for More than 3 Current-Carrying Conductors in a Raceway or Cable
Number of Current-Carrying Conductors Percent of Value in Tables 310.15 through 310.19 as Adjusted for Amb Temp if Necessary
4-6 80
7-9 70
10-20 50
21-30 45
31-40 40
41 and above 35

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