We have an electric dryer with a 3-prong plug on a cord that meets the manufacturer's requirement of a minimum 120/140-volt, 30-amp power supply. The plug is the kind that matches a "NEMA Type 10-30R" receptacle; that is, there are two flat blades angled out from each other and a third L-shaped blade. The dryer owner's manual says, "This dryer is manufactured with the 3-wire, frame-grounding conductor connected to the NEUTRAL (white or center) or the wiring harness of the terminal block. Do not have a fuse in the neutral or grounding circuit."
Our new house has an outlet that was previously used for a mill (the previous owner did a bunch of woodworking) and is on a 220V circuit. The breaker switch for the outlet fills 2 slots in the breaker box and says 20; I'm not sure if this means 20 amps total or 20+20 = 40 total. I suppose this could affect whether or not the circuit is compatible with a dryer that needs 30 up to amps.
The existing outlet says it is for 125/250V and 50 amps. It has 3 holes, with 2 of the holes angled out about like the 2 blades on the dryer plug, but the 3rd blade is flat and vertical rather than L-shaped. The existing wires in the wall are a black, a white, and a bare copper wire.
I purchased a dryer outlet to match the dryer plug for just a couple of bucks, but I want to be sure that the new outlet will be compatible with the wiring setup in the wall. If it will, I want to be sure that I connect the correct wires in the wall to the correct terminals in the new outlet. Which wire goes to which terminal in the new 30A 125/250V outlet?
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