Conductors shall be permitted to be run in parallel in accordance with the provisions of 310.10(G)
. The requirement to run all circuit conductors within the same raceway
, auxiliary gutter, cable tray, trench, cable, or cord shall apply separately to each portion of the paralleled installation, and the equipment grounding
conductors shall comply with 250.122
. Connections, taps, or extensions made from paralleled conductors shall connect to all conductors of the paralleled set, grounded
, as applicable. Parallel runs in cable trays shall comply with 392.20(C)
Exception: Conductors installed in nonmetallic raceways run underground shall be permitted to be arranged as isolated phase, neutral, and grounded conductor installations. The raceways shall be installed in close proximity, and the isolated phase, neutral, and grounded conductors shall comply with 300.20(B).