Courtesy of www.MikeHolt.com. Based on the 2020 NEC. Q. What are the Code rules for bundling adjustment to conductor ampacity? See the answer below. A. Where four or more current-carrying conductors ...

A. Conductor ampacity adjustment from Table 310.15(C)(1) does not apply to conductors in raceways having a length not exceeding 24 in. [Sec. 310.15(C)(1)(b)]. For example, let’s say you have five 3/0 ...