Since 12 gauge wire run from a 20 amp breaker is a max. of 50 feet, based on voltage drop table. I want to know if I can run 10 gauge wire from the 20 amp breaker for approx. 50 feet to a j box the 12 gauge wire from there for 25 more feet to a 2000 watt 120 volt 20 gal. electric water heater, which is all that will be on that line. Then run the same set up on another 20 amp breaker to lights, a receptacle and an exhaust fan.
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