Posted by BarnyardEngineering on February 04, 2019 at 10:39:05 from (173.186.244.245):
In Reply to: Backfeeding posted by Bob on February 03, 2019 at 15:30:11:
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It's open until someone forgets to open it, and that is the A-number-one issue with backfeeding.
A transfer switch is an interlock, one cannot be closed unless the other is open. The simplest example is a double throw knife switch. It is physically impossible to have both mains and generator power connected at the same time because of the design of the knife switch. Automatic transfer switches achieve the same thing with magnetic switches. There are also transfer switches that allow you to power certain circuits in your house from the generator by flipping switches on the transfer panel. These are wired inline with the regular breakers you choose, and have double-throw switches on each circuit.
There are interlock devices you can put on your circuit breaker panel that connect your main panel breaker with your "backfeed" breaker so that both cannot be on at the same time. It will be some sort of "tug of war" mechanism or "see saw" mechanism.
I have read that in the case of some makes and models of breakers, though, that open isn't really open. Current can't flow in from the mains, but for some reason by the design of the breaker, current can flow OUT. So even if your breaker switch shows OFF, you're still energizing the line. This is just what I've read in threads like this, so it may or may not be true.
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