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Also, be wary of torn/significantly beat up extension cords. Look for outlets that don't work, light switches that are hot to the touch, and lights that flicker. This could mean something is wrong and should be checked by an electrician.

Summary:
Immediately fix appliances or lamps that sputter or spark in any way or give you a shock when operated. Keep appliances away from wet areas, especially in the kitchen, bathroom, basement, and garage. If an appliance has a three-prong plug, never force it into a two-prong outlet or extension cord. Check your wiring on a regular basis. Keep clothes, curtains, and other potentially combustible items at least three feet from all heaters.