In installing a dishwasher on a dedicated 20amp circuit on 12g wiring, I've come short about 5 feet to run a line. I have some surplus, heavier, 10g wire. Would it be safe to install a junction box and hook 10g wire to the existing 12g wire to bring enough wire to the dishwasher?
Wiring – Is it within code to complete 12g wiring circuit with 10g wire
code-compliancesafetywiring
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Best Answer
I don't like it since it risks potential confusion in the future as to whether the circuit could be upgraded to 30amps, but if you're going to do it, use the 10g wire at the end of the run and not at the breaker panel where the mistake would be easier to make.