Home Wiring System More than 30 million homes, or about one-third of the homes in the United States are at least 50 years old, and studies have shown that the frequency of fires in these aging homes is disproportionately high. Many older homes were built with electrical systems and components which are no longer safe and may be considered as fire hazards. Fire and other electrical safety concerns may arise due to aging, improper installation and alteration, or misuse. It is important to identify what type, color, and size wire is needed in order to properly address hazardous situations before they become critical. Knob & Tube Wiring: 1800s–1930s Knob and tube wiring was designed as an open air system that used ceramic knobs to separate wires from combustible framing. These suspended wires were directed through ceramic tubes to prevent contact with the wood framing and starting a fire. Today, knob and tube wiring is considered a fire hazard because it is not a grounded system,...
Circuit Breakers All newer homes are protected by circuit breakers. Unlike a fuse that must be replaced when it blows, a circuit breaker that has “tripped” can be mechanically reset to resume operations once the problem has been resolved. A tripped breaker is likely the result of too many appliances overloading the circuit and should be fixed immediately. Instructions for Resetting a Tripped Breaker: Unplug or turn off appliances in the room. Find your main breaker panel and open the cover. Locate the tripped breaker or blown fuse. A tripped circuit breaker will be in the off position or in a middle position between on and off. To reset the breaker switch it to off position and then back to on. This may restore power to the room. If the problem continues, there may be more serious issues. Contact an electrician to diagnose the problem. Arc Fault Circuit Interrupters (AFCIs) AFCIs are new protective devices that replace standard circuit breakers in the electric service panel. AFCI...