Tekkie® wrote:

Nate Nagel wrote:


I don't think it's acceptable to do it this way at all; you need to
use 14/3 because code requires that the current be balanced within a
single cable or pipe at all times (to avoid induction heating.)


nate


What BS !

The NEC requires all conductors being used that are in the same circuit
to be in the same cable or pipe (a few exceptions). In the past you
could run 2 2-wire Romexes together for 4 wires. That is no longer
permitted. Induction effects are a problem when all conductors don't go
through the same metal pipe or the same knockout in a metal box and
there is a large current imbalance.

At a local univeristy the display on some CRT computer monitors was
being distorted. The problem was traced to the power transformer for the
building. The secondary wires at the transformer were separated running
through open air. The larger the loop formed by the wires the larger the
magnetic field radiated. The magnetic field distorted the displays.
Presumably this could happen in a house at 15A with the circuit wires in
a large loop. In addition at the university some of the single wires ran
through metal bushings. The bushings got hot enough to melt the
insulation on the wire.

In the OPs case a separate wire is inadequately protected anyway.

--
bud--