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You may not know it, but you have safety switches in your home and, probably, in many of your electronic devices, too. These switches monitor the flow of electricity through the wiring. They can detect changes in flow or imbalances in energy in vs. energy out. They respond fast, sometimes within fractions of a second. Their response it turn off the flow of energy through that wire, which also turns off the appliance or device and can stop the flow of power to part of your home.
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