Fuses and circuit breakers are meant to regulate the amount of electrical current that flows through a given section of the home. A typical fuse may tolerate 30 amps of current. If a fuse is attached to a circuit that is actively supplying more than 30 amps, sending current to say an air conditioner, radio, and lamp, then the fuse will blow and break the circuit. This prevents circuit overloading, which can lead to dangerous electrical fires. The fix for this problem is to move heavy electrical use items such as a hair dryer to a less overloaded circuit, so as to keep the electrical flow even throughout the house.
Short circuits are another cause of excessive electrical flow and blown fuses. The short circuit may be caused by a live wire touching another live wire or a neutral wire. When this occurs, too much electricity begins to flow in the circuit that is shorted, and again the fuse blows. The location of the short circuit may be in the home wiring, in an electrical fixture, or in the fixed wiring system. To test it out, turn off all electrical appliances and wall lighting in the house. If the fuse or breaker cuts off then the short is in the home wiring. If not, turn on fixed electrical circuits one by one. If this doesn't trip the breaker or blow the fuse then plug in electrical appliances one by one When you add in the circuit that has the short the fuse will blow or the breaker will trip. The solution is for the homeowner or electrician to repair the faulty circuit.
Finally, a loose wire, can cause too much electrical flow as electricity is expended trying to jump the gap. The solution here is to locate the loose circuit.
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