Multi Wire Circuit Question?
I own a home that has a 200A service panel outside that houses all of the 220V circuits with a 70A double pole breaker supplying a sub-panel in the laundry room. All of the circuits coming out of the sub panel are 12-3 multi-wire circuits. The house was built in 1983, so I’m not sure what the electrical code was back then, but when mapping out the circuits I discovered that all of the multi-wire circuits in my opinion are on the same phase. I traced them out and found 0V across the breakers going to each circuit. I thought that I should be getting 240V if they were indeed out of phase. I also thought that by current NEC the breakers should be double pole or should be mechanically linked so that both 120V legs are off at the same time. Any help would be much appreciated.
Some electricians will run 120V circuits using 12-3 W-G. Red and black leads on the breaker and the white on the neutral bar and the ground (bare wire) on the grounding bar. This saves time and money by running one wire versed two wires for two circuits. Any further questions and you can email me at: builder1@charter.net Regards, Dale
Omni-Bus 220-240V ~ 50Hz Lighting Control Network
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