I would expect the charger to have a bridge rectifier at its input,
preventing the charger from supplying power. There may be a small amount of
energy available in the EMC filter, but that should be less than normal
line surges that a robust product has to deal with.

That said, far too much stuff nowadays isn't robust and well engineered,
it's cheap so people will buy it. It's also definitely a good idea to have
the breakers ganged together in a 240V setup.
On May 11, 2013 9:55 AM, "Steve Clunn" <[email protected]> wrote:

> We have moved in to ( and are still moving) our new place, and my work
> shop was set up with 240V coming in, but it had a 15amp and a 20amp
> breaker, not ganged together to supply power for the shop.    So I am
> charging some stuff up with the PFC Charger and one of the breakers
> pops.  I am out in the yard working and I hear the charger cycling up
> and down and turn off the charger and check the breaker and, yes,  one
> is popped.   Later, I discovered one of my drill chargers wasn't
> working. And I realized when the one leg popped, the charger probably
> pushed current through what ever was plugged into the other leg and
> probably over voltaged my poor, little drill charger.. luckily it
> wasn't from my NEW drill. ( one more thing to fix now !)...   But this
> is something to keep in mind when plugging in your charger.... Making
> sure your breaker will shut down BOTH legs if it is tripped.   This,
> of course, would be the problem with taking power from 2  120V outlets
> that are not on a ( Ganged) breaker.
>
> Steve Clunn
>
> --
> Steve Clunn
> Tomorrow's Ride...Today
> www.Greenshedconversions.com
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