On Mon, 30 May 2016 02:23:31 -0000 (UTC), Diesel
wrote:


7.9 volts lost 12/2 at 100ft
4.97 volts lost on 10/2 at 100ft

240-7.9=232.1 on the 12ga
240-4.97=235 on the 10ga


And that's due entirely to distance with no loads present on the line
yet.

With no load, there is no voltage drop at all.

If you are actually dropping 7.9v you do not have a 1500w heater
anymore. The element is going to be still around 38.4 ohms (the
element did not change, just the voltage) so at 232.1 v heater draws
6.04a and becomes a 1402.8w heater.

1500/232.1=6.5 amps *rounded up*
1500/235=6.39 amps *rounded up*

This means nothing at this point unless you are changing the element
to get 1500w at 232v.