Merlin
Sorry, but I disagree with your Eng.
I ran some calculations using 120 Volt, 1 Amp load with 3% allowable voltage drop(this is probably high for a Starter or Control Relay coil, Pilot light or PLC I/O situation).
Results with 75 degree C operating temp:
#12 = 750 feet
#10 = 1250 feet
Note: If your operating temp or load (Amp's)is less the length increases.
I agree with Bjarney, using High Voltage for control is not a recommended practice!!!
