Most all "Romex" or NM cable as it is, meaning non-metallic outer covering,
has a bare copper conductor the same size as the insulated wires up to size
#8. Once you hit size #6, the bare copper wire is smaller than the insulated
wires. This bare wire is the equipment ground, which would be the same as a
green wire that would be pulled in a non metallic conduit for an equipment
grounding conductor. Take BX for example, this has a metallic jacket and is
"code" for use as the equipment grounding conductor in residential wiring. In
commercial use MC cable must be used which has a 3rd green wire and therefore
the jacket is not considered an equipment grounding conductor. For most
amplifiers that put out up to 1500 watts, and for runs back the circuit
breaker
panel of 75 feet or less #12-2 wire is more than adequate. Amplifiers
capable of higher output than 1500 watts with runs of wire over 75 feet to the
panel may require larger than #12 wire, one may consider #10 or higher
depending
on the amplifier needs. Lou
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