BASIC NEC CODE RULES AND DESIGN PRACTICE

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conduit, then wires must be derated according to Note 8, after Table 310-19 as follows: TABLE 1 Number of Conductors Percent of Values in 310-16 *1-3 80 *4-6 80 7-24 70 25-42 60 43 and above 50 *If circuit is loaded up to 80% ampacity, then 6 phase wires can be put in one conduit.

  Conduit