Adding a wire to a feed/supply circuit ?

Thread Starter

Externet

Joined Nov 29, 2005
2,232
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' ?)
 
Last edited:

MaxHeadRoom

Joined Jul 18, 2013
28,759
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.
 

nsaspook

Joined Aug 27, 2009
13,418
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.
 

MisterBill2

Joined Jan 23, 2018
18,934
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.
 
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