RSE Master Electrician
I disagree. Those rules and exceptions are not meant to be used when running multi-wire cables, they are for single conductor. The CEC also has similar codes for when doing that.
The NEC is confusing. 300.3(b)(3) Say's it's allowed as long as 300.20(b) is followed. Yes 300.20(b) is for single conductors but it's 300.3(b)(3) that got you there.
(3)Nonferrous Wiring Methods.
Conductors in wiring methods with a nonmetallic or other nonmagnetic sheath, where run in different raceways, auxiliary gutters, cable trays, trenches, cables, or cords, shall comply with the provisions of 300.20(B).
@Dennis Alwon, what is your interpretation of these NEC articles? Can a circuit be split up into different multi wire cables for three way switching and are the NEC articles posted allowing it?