For indoor wiring, 12 AWG wire can be fed with a breaker no more than 20 amps. At some point, that rule stops and voltage drop and heating effect are still left for calculations. I don't know where that rule stops.Cary the wire that came with my pump what I mean is the factory installed wire that was approximately 6 feet long attached to the pump that I had to tie into is pretty small. Will it be okay if I used 10 gauge wire and tied it into 12 gauge. With all three strands of the same gauge just changing gauge when I don't have enough to make it all the way. And if so which end would you put it on the breaker end or the pump end. Thanks again
The Franklin AIM manual, page 12 has a section titled "Two or More Different Cable Sizes Can Be Used". It discusses computing voltage losses with more than one size wire.
EDIT:
How about posting a photo of your pressure switch wiring. I would like to see what is going on there. Identify which wire is which.
You should disconnect your well wires at the pressure switch and repeat the ohm readings. But the photo may explain something.
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