For general purposes the incoming service voltage to a house will not drop
appreciably for most applied loads. I'm assuming that the serving utility
is providing a decent level of voltage to begin with. Most of any drop seen
up to the meter base is found in the service conductor. A little is
contributed by the service transformer. From the panel to the load is where
the drop gets significant. Most 240V powered amps draw less than 20A
(ignoring in-rush) so are fed by #12awg. A significant run of #12 will give
you some healthy voltage drop. My suggestion for amp supply circuits is to
use #10 as a minimum, #8 is even better. Oh yes, seperate circuits for
each amp.
73 Gary K7FR
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