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As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

A breaker won’t always trip if an outlet burns out. If the outlet is overloaded or has a short circuit, the breaker is designed to trip and discontinue power to the outlet. However, some wiring problems that can burn out an outlet may not cause the breaker to trip, so don’t rely on it as a signal that something is wrong.

Typically, when a 3-way switch only works when one switch is on, this is one of the most telltale indicators that the switch has gone bad (although this could also be the result of faulty or loose wiring). To diagnose the issue, toggle each switch until the light comes on. Once it’s on, toggle each switch separately again; the switch that doesn’t turn the light off is the bad switch. 

An outlet can trip because the circuit it’s on is overloaded, meaning the devices plugged into it are drawing more power than the circuit can safely carry. Another culprit could be because a power surge from a storm or accident caused a problem with your local electrical grid or there’s a short or a fault causing power to run through the circuit in a dangerous or unplanned way.