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Originally Posted by 2pts
Yup it does the whole house, it is the first breaker on each phase, it instantly sends all surges to the ground, as electricity will always flow the fastest and shortest route to ground. At least that (or something like it) is what I read back when I was researching it.
It comes in a panel pack @ home depot, pop in that isle next time and read up on it (box and pamphlet I believe), it's a pretty cool gadget.
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Very interesting, I'll definitely have a look see. I've got a Siemens 100 amp panel which replaced an old "Pushmatic" panel that had only 12 breakers. It's an older home and when I first checked out the old Pushmatic E panel it was pretty scary. There were no spare circuits whatsoever and the previous owners had an extra set of 240 volt wires in there. At some point they installed an electric dryer to replace a natural gas one and this meant that the central air conditioning had to be disconnected to run the dryer, ha ha. They were swapping wires on the 30 amp 2 phase breaker every time either the electric dryer or the air con was the priority!