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Square D Homeline 40, 2-Pole Circuit Breaker-HOM240CP -, Home Depot - It seems like you'll be improper as to how this is stressed, or that perhaps i'm just not expertise your rationalization. As others have noted, it's now not possible to get 240 volts from a single pole in a a hundred and twenty/240v split section gadget. Every tandem breaker offers 2 one hundred twenty v circuits, this is genuine. However, in case you degree among the terminals on a unmarried tandem breaker, you may get zero volts. That is due to the fact the terminals are each powered from the identical leg, and so are at the identical voltage potential. In case you measure from a terminal on the pinnacle tandem breaker to a terminal on the bottom one, then you may degree 240 volts. That is due to the fact every breaker is hooked up to a extraordinary leg, which are every one 1/2 of a 240 volt circuit. I have study that tandem breakers may be installed to either feed power from one leg of the bus bar or from different legs. If it is the latter for your case, then you definitely'd be getting 240v in the end. Take a look at the terminals of the breakers in question (or test at the stores wherein your appliances are plugged in) with a voltmeter, if you have not already, and affirm what's surely being fed on your home equipment.
This appears all sorts of wrong, even though. It is nevertheless a single pole breaker, despite the fact that there are 120v circuits coming off it. It looks like if this turned into ok, that i would listen approximately the usage of a tandem breaker as a space-saving slim 220v breaker... However i've seem not anything. I inherited a prime panel field from a home owner that wasn't continually fond of meeting the required nec codes. As such, there are some oddities inside the panel. One such oddity is the reality that he hooked up multiple tandem circuit breakers to be used in one hundred twenty/240 circuits.
In the case of the dryer circuit, there may be one 10/three nm twine, with the recent black attached to one of the sides of the tandem breaker and the recent red attached to the alternative aspect. The impartial is attached to the neutral bar. Inside the water heater case, there's a 10/2, with both the white and black attached to their respective facets of the tandem breaker.