![]() ![]() Each tandem breaker provides 2 120 V circuits, this is true. As others have mentioned, it's not possible to get 240 volts from a single pole in a 120/240V split phase system. It sounds like you may be mistaken as to how this is wired, or that perhaps I'm just not understanding your explanation. It's apparently connected to the left bus and only that bus. The popped dryer breaker is clearly a single pole, as you can see the one entry slot. I removed the top double-pole breaker for clarity. You can clearly see the two buses and that there doesn't appear to be any shenanigans connecting the two of them. The first 30-amp tandem is the dryer breaker and the second is the water heater.ĮDIT 2: Added photo of the dryer breaker popped off the panel: The very top is a double-pole 20-amp breaker that's fine. ![]() So, what's wrong with doing this? What's the ramifications if I don't change these two out with traditional double-pole breakers?ĮDIT: Added photo of the breakers in question: It seems like if this was okay, that I'd hear about using a tandem breaker as a space-saving slim 220v breaker. It's still a single pole breaker, even if there are two 120v circuits coming off it. Both the dryer and water heater were wired this way well before I moved in and it's only now, years later, that I noticed what was going on. I want to stress that this absolutely is working. In the water heater case, there's a 10/2, with both the white and black attached to their respective sides of the tandem breaker. The neutral is connected to the neutral bar. In the case of the dryer circuit, there's one 10/3 NM wire, with the hot black attached to one of the sides of the tandem breaker and the hot red attached to the other side. One of these breakers is used for the clothes dryer and the other for an electric water heater. These are tandem breakers and not "slimline" or "thin" breakers - the two breaker switches on each are not connected in any way. Specifically, there are two Murray MH-T 30-amp breakers. One such oddity is the fact that he installed a couple of tandem circuit breakers for use in 120/240 circuits. ![]() As such, there are some oddities in the panel. I inherited a main panel box from a homeowner that wasn't always fond of meeting the required NEC codes. ![]()
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