I didn't say it couldn't *be,* I just said it couldn't be *correct.* And it's not. That's why I suggested you have an electrician check it out. It sounds like maybe the equipment got inadvertantly connected to two different circuits somehow, which is a code violation, as there needs to be a single disconnect for each circuit. Otherwise if you kill the breaker marked "A/C" and don't subsequently test it, you could get a nasty surprise.
Since you apparently have a meter, I would do the following: turn off each breaker one at a time and see if there's voltage on the wire connected to the output of that breaker. If there is, you got a problem that ought to be fixed.
nate
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Aah. My misunderstanding. I'll check it out as you describe, with my analog meter. That will at least point me in the right direction for isolating the problem, I would think.
Many thanks.
Dave