Many of appliances need to be plugged into grounded circuits.
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Ryan said putting a computer on a separate, grounded circuit is an excellent idea.
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Grounded circuits have a wire that is attached to cold-water pipes and to a rod buried in the ground.
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"Anybody who has a computer or any hotsy-totsy electronic home-entertainment equipment really needs to get it on a grounded circuit, " he said.
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Make sure the light is plugged into a grounded circuit, preferably a GFCI, because you will be working around plumbing fixture that offer an excellent ground.
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Modern homes have electric outlets with three holes; in grounded circuits, the third prong on an appliance cord goes into the third hole on the outlet and hooks up with a path for electricity to be sent safely into the ground in case of a break in the normal electrical flow.