"Toller" wrote in message
...
I know it is unsafe to combine wires to avoid over loading a circuit; like
using two #14 to carry 18a. One could come loose and the other is
overloaded.
But how about doing it to avoid voltage drop?

I have no power at my dock, and carrying my generator down 130 stairs
isn't
any fun. I have done it once, and probably never will again.
It is over 120ft, so a #12 extension cord would have excessive voltage
drop
on a circular saw

A guy is selling a 250 roll of 12/4 wire for $50. As far as I can tell,
it
is something for audio hookups and has no ground. Could I treat it as
12/3
with an insulated ground, connect two of the wires together to reduce
voltage drop, and leave it as a permanent extension cord? I figure that
with two wires connected, the VD would be reduced to a manageable level.
(yes, I realize the return is only single, but it seems okay if you
average
the two) There is no reason the wires should ever come undone, but if they
did, the worst that could happen is burning out my saw.

Does this make sense?
Is this 12/4 stuff safe for 120v?

I did the same thing when I installed my transfer switch. All I needed
was
12/2, but I used 10/3 in case someone needed it in the future; since the
labor was the same either way. I connected two wires together to reduce
VD.
A little overkill, but it was just sitting there anyhow.

the NEC is pretty specific about paralleling conductors. You need to have at
least 1/0 awg before paralleling.

http://www.electrician.com/vd_calculator.html

Is this 12/4 audio cord even insulated for 300v? Lowest rating of most
extension cords.