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Mice and other rodents like to gnaw on electrical wires to control the length of their teeth. Over time, they can remove the sheathing, leaving the wires exposed. Unfortunately, the electric current that travels through the wire generates heat, and in the absence of sheathing this could lead to sparks caused by short circuits, which in turn could ignite the surrounding surfaces. If you suspect a rodent infestation, call a professional exterminator immediately.
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