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What is a generator changeover switch?A generator changeover switch is basically two breakers in one. One switch directs the power from the main supply and the other from the generator. Both breakers can feed power to the chosen circuits, but not at the same time. The key is a locking mechanism that connects both breakers so that when one is switched on, the other is, by default, off. This operating mechanism is crucial so as not to get any back-feed for the generator or the main supply line.
An example of a basic changeover switch configuration
 
Back-feeding can be a very dangerous occurrence in which electricity from your generator flows back through your electrical panel and the meter into main supply line. Back-feeding occurs when a generator is connected to your main wiring system without safely detaching it from the municipal power line.
The most common way this could occur is if you directly connect a generator to your electrical panel or to a socket outlet in your home.
This could result in electrocution for the electrical crew working further down the main power line. Furthermore, when the power is restored while your generator is on, your distribution board, generator and main supply line will be severely damaged.
How can back-feeding be prevented?
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