Hello all.
Does anyone know if it is allowed/legal/approved for USA to add a single insulated conductor to a 'Romex' two conductor plus bare wire as to use it/make it a three conductor plus ground connection for split phase 230V as black + white + added grey + bare ground ?
Would the added wire have to be tape-held/attached to the 'Romex' ? Can it take a different path ?
(Instead of replacing the 2+gnd 'Romex' with a 3+gnd 'Romex' ?)

 

I don't recall anything against it, but any and all terminated ends of the added cables require the correct colour code ID, tape etc to indicate its purpose.

 

I may remember something like the added cannot be green...

 

Hello all.
Does anyone know if it is allowed/legal/approved for USA to add a single insulated conductor to a 'Romex' two conductor plus bare wire as to use it/make it a three conductor plus ground connection for split phase 230V as black + white + added grey + bare ground ?
Would the added wire have to be tape-held/attached to the 'Romex' ? Can it take a different path ?
(Instead of replacing the 2+gnd 'Romex' with a 3+gnd 'Romex' ?)

I hope it's your house this electrical work is being done on. Mark it and label it. They do need to all enter the box in the same hole as a set if all 'hot's are from the same breaker pair.

 

Electrically it will work just as well, BUT there is always the issue of mechanical protection. Standard "Romex" cable has the plastic insulation on the wires, then a fiber wrapping over each plastic insulated wire, and then either a braided fiber or a plastic molded cover over that. So the mechanical protection is much greater. If the wires run in electrical conduit, either plastic or metal, that is almost always adequate physical protection.