Single conductors specified in Table 310.4(1) must be installed in a Chapter 3 wiring method [Sec. 300.3(A)]. All conductors of a circuit, including the neutral and equipment grounding conductors ...
Nonmetallic boxes can only be used with nonmetallic cables and raceways. Ex 1: Metal raceways and metal cables entering nonmetallic boxes must be bonded to the circuit equipment grounding conductor.