14 Practical Using 12 Gauge Wire With 15, Breaker Galleries
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I ran across a panel nowadays that has a water heater and a dryer installed the use of tandem breakers. They're not cut up both. This panel is configurable to half of a slot, meaning a ordinary 110vac breaker might be clipped into 2 prongs of a live bus, and there may be a small plastic wall separating the b facet from the a side maintaining you from shorting the two 110vac circuits collectively. But, the tandem breakers have a slot cut out allowing you to plug into each facets. Each side of the tandem breaker gets its personal feed from its personal prong on the buses making 220vac.
It feels like you will be improper as to how that is stressed, or that perhaps i am simply no longer knowledge your clarification. As others have mentioned, it is now not viable to get 240 volts from a single pole in a one hundred twenty/240v cut up phase device. Each tandem breaker affords 2 one hundred twenty v circuits, this is real. But, in case you measure between the terminals on a single tandem breaker, you will get 0 volts. That is due to the fact the terminals are both powered from the identical leg, and so are on the identical voltage capacity. In case you degree from a terminal at the top tandem breaker to a terminal on the lowest one, then you may measure 240 volts. That is because every breaker is attached to a different leg, which might be each one 1/2 of a 240 volt circuit.
Modified to in shape to new furnished data. Rapid petey's answer includes the circuit breaker you want to install to correct the situation. As you could see from the breaker inter-ties, they essentially take of these breakers and manually finish off what the installer was trying to do in a safe manner.