For the 240 volt service to my operating position, I have a total run of
75 ft from the breaker panel to the amp outlet. I installed #10 - 3
w/ground with a dual 20A breaker in the panel. Even though most of the
run is in the attic, 90ºC rating is adequate in as much as it is not in
conduit. If installed in conduit, it must be derated. When you put
Romex inside conduit the Romex cannot breathe and retains too much heat.
Hence the reason for derating.
73
Bob, K4TAX
On 7/9/2018 7:40 PM, Jim Brown wrote:
On 7/9/2018 12:26 PM, Bob McGraw K4TAX wrote:
I would also suggest using three - #10 with ground as the line from
the breakers to the amp operating position.
Not only a suggestion -- it's the law! Electrical Codes carry the
force of law, and they require that the equipment ground must 1) run
with the current carrying conductors and 2) must be no smaller than
the largest conductor.
73, Jim K9YC
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