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Heater will be 240v and about 50-55 feet from the panel. I'm doing the ceiling remodel and adding lights and wiring. While I am up there, I will drop in dead wire/conduit for the future tankless install by an electrician to save on install costs. I'm guessing #8 or #6 wire will do, but need to be sure.
If both panel and charger have steel chassis and the conduit is non-flexible and metallic, then you do not need a ground wire. If you do need a ground wire, follow instructions but 10AWG Cu should suffice, in bare wire, green, or green/yellow. These are the only permissible colors for grounds, and vice versa.
The old units were rated for 30 amps each and the new units require 40 amps. We have a 200 amp main panel with one 40 amp breaker for the oven/cooktop that feeds 600 volt 3-6 aluminum wiring to a subpanel. The subpanel currently has one 30 amp breaker feeding NM-B 10-3 to the cooktop and one 30 amp breaker feeding NM-B 10-3 to the oven.
6 AWG copper wire (x4) for a run less than 75ft., 4 AWG copper wire (x4) for runs less than 150ft. 60 ampere panel with 60 ampere main breaker. Unless you're running a whole bunch of stuff at once, a 60 amp panel should serve you well. If you're running individual conductors, you'll definitely want to run it through conduit.
3. My new range says it needs a 40-amp circuit breaker minimum. But it also says maximum draw is 13,200 watts on 120/240, so doesn't that mean a 40-amp breaker would be inadequate? By my math, max wattage on a 40-amp circuit is 9,600, de-rated to 7,680. I'm unlikely to have the oven and all five stove segments going full burn at once, but ...
A 40 amp breaker needs a minimum of 8 gauge, larger gauge won't hurt. If using 39 amps (actual) at the same time, then you might need to use a 50 amp breaker with 6 gauge wire minimum. If sub panel is in the same building then I think you only need the ground wire back to main. – crip659. Jul 12, 2022 at 23:08.
Most likely you need 8-3 with ground thnn or thwn with 50 amp disconnect mounted within several feet from unit with a 50 amp circuit breaker in the main distribution panel. This is good for 50 amp rated unit. Use 10 awg for 30 amp unit or 6 awg for 60 amp unit. These rating are adequate for runs of up to appx 60 ft
In the breaker panel it's hooked up to a 30-amp double pole breaker with #12 wire. Inspector notes that #10 wire should be used for 30-amp circuits so that the wire does not melt before the breaker can do its job in an over-current situation. This makes sense to me, but I'm thrown off by the double-pole configuration.
The size (diameter) of wire conductors from the breaker in the panel over to where the dryer plug is located. The primary function of the panel breaker is to protect the wiring from ever being used at a current rating over its rated size. If that wire is 10AWG then the breaker needs to be a 30A breaker. 8AWG wire may be used with a 40A breaker.
If a 15 amp breaker is installed on a 12 gauge wire, any electrician should think the wire is a long run and not that it was incorrectly installed on a 15 amp breaker. Before changing the 15 amp breaker to a 20 amp breaker, it is the responsibility of the electrician to make sure the entire circuit is run with a minimum wire size of 12 gauge.