So lets say in a conduit going out to a panel I had one ciruict with a hot and a neutral both #10 feeding a receptacle. Lets say I had another ciruict with a hot and a switch leg feeding a temperature switch (no neutral just a contact switch). Lets say the hot and switch leg feeding the temp switch were both #12.
Now it has been decided that we want to replace the mechanical temp switch with an electronic one so besides the hot and switch leg we have, we will not require a neutral. Is it legal to bug onto the neutral that is existing at the receptacle that I stated above?
I got lost at at that word, do need a grounded conductor or not?
If so, 300.3(B)
(B) Conductors of the Same Circuit. All conductors of
the same circuit and, where used, the grounded conductor
and all equipment grounding conductors and bonding conductors
shall be contained within the same raceway, auxiliary
gutter, cable tray, cablebus assembly, trench, cable, or
cord, unless otherwise permitted in accordance with
300.3(B)(1) through (B)(4).