Other than the diseases they can spread, one of the biggest threats to human health from a mouse infestation is their propensity for chewing through electrical wires and cable. Not only can this cause your home and appliances to lose power, but it also represents a serious fire hazard. According to some estimates, mice could be responsible for as many as one in every five unexplained house and structure fires every year. Damage to cables and wiring is also one of the first clues many people notice that they might be sharing their home with some unwanted guests. If you have started hearing strange noises coming from your walls or attic, or you’ve noticed any of the other signs of a potential rodent infestation, you should start checking your cables for any signs that mice are chewing them.
The most obvious indication that a mouse has tried to chew through a wire will be bite marks on its casing. Any inexplicable scratches or teeth marks you can see on the wire’s coating must have been caused by something, and that something is usually a mouse. Check the surroundings for any other evidence of mice, such as droppings. If you have a UV light, it is worth running it over the area. If a mouse has stopped by to chew on your wires, it will likely have left a trail of urine that will glow under UV.
If the only evidence you have to work with is a broken wire, look for any other possible explanation. Check the remaining wire ends carefully for evidence of melted plastic, which would indicate an electrical issue. If you can’t think of any other cause, you should search your property for any other evidence of a mouse problem.