> You will need 12/3 (which is 3 #12 wires & a separate
> ground) to run a 220V circuit.
> Black and Red for the Hot wires. White for the Neutral and
> the bare (or Green) for the Ground.
Three wires, two insulated and one bare ground, is fine as
long as there is no current return on the neutral. Most
correctoly designed amplifiers are built to float the 240
system and not use a neutral return.
Four wires are only required if the PA has 120V circuits. In
that case the 120V returns CANNOT be connected to the
chassis, they have to float and be connected only to the
neutral return. That means three insulated wires plus a
ground.
>
> The Breaker will determine the gauge. If you install a 20
> Amp breaker, you may run 12 Gauge. A 30 Amp Breaker
> necessitates 10 Gauge wire. Regardless of which gauge you
> run, you can then terminate in a 15 Amp or a 20 Amp outlet
> in the shack.
Not exactly. I have 000 copper for about 150 feet coming
into my shacks and they are fed from 70 amp breakers. You
can oversize the wire for the breaker, and that's what I do
because (as Hams seem to constantly forget) capacitor input
supplies have terrible power factor and a well-built supply
does much better when a long run of wire is oversized.
Also, you should NOT use a 15 or 20 amp outlet on a larger
breaker. Do NOT use a 30 amp breaker to power a 20 amp rated
outlet. The weakest link sizes the breaker.
73, Tom
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|