The other instance is having a transfer switch in which you can switch between live power and a generator for backup power.
Electrical Basics 101
By Timothy Thiele, About.com Guide
A disconnect switch is mounted on the outside of your home close in proximity to the meter on the outside of your home or power pole. The advantage of having a disconnect switch is for safety. In the event of a fire or flash flood, you can shut the power off from the outside of your home verses having to enter a burning home or a flooded basement.
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- Main Breaker
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Electrical Knowledge and Safety
Six Ways of Preventing Electrical ShockHow an Electrical System WorksTesting Electrical Circuits
Electrical Service Breakdown
How To Wire an Electric MeterHow To Wire Electrical DisconnectsHow to Wire An Electrical Panel
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