This answer is based on the 2017 NEC. A. Separate raceways or cables containing parallel conductors must have the same electrical characteristics [310.10(H)(3)], as shown in the Figure. If one set of ...

All Code references are based on the 2005 NEC. The grounding and bonding requirements in this column apply to solidly grounded systems that operate at not more than 600V, such as 120/240V, 120/208V, ...