Your #10 wire is under-sized. #8 is commonly used on
50 amp circuits in
some areas because the common household breaker will trip before a
continous load of 50 amps is reached.
He is running it thru a 25 Ampere breaker, right? #10 can safely handle
30. Of course, he could upgrade the breaker above 30, in which case, yes,
the #10 is too small.
Actually, upgarding the breaker might be a good idea, as we all know he
is just going to get more big VAXen...
William Donzelli
aw288(a)osfn.org