chris huckins
Member
- Location
- collinsville,il
Need some help determining if a control conductor is considered current carrying or not. I understand that per Table 310.15 (B) (3) (a) power and lighting ungrounded conductors are always considered to be current carrying but generally control or signal conductors are not. Is this determined locally per specific installation (gray area) or is their something definitive in the NEC stating that control and signal cables are not counted. Ex. Two sets of 3-phase, 3-wire circuits, each comprised of 4 AWG THWN copper motor branch-circuit conductors are installed in the same conduit with two 14 AWG THWN copper control circuit conductors in an ambient temperature of 30 degrees celcius. Is the allowable ampacity based on 8 current-carrying conductors or 6 current-carrting conductors?