After choosing the electrical source, decide where to cut the walls and ceilings to run the new cable. For example, to run from an existing wall receptacle up to a new ceiling light fixture, a small hole should be cut in the corner where the wall and ceiling meet. The top plate is then notched to pass the cable and afterwards a metal plate is attached over the notch to protect the wires.
Use a straight edge held flat against the top of the base cap to keep your line straight as you pull the knife through the caulk several times until it’s cut cleanly.
A heavy duty circuit switch located in the service panel and designed to instantly shut off electricity if an overload or short occurs. Circuit breakers are rated for the amount of current they can carry. 15 amp circuit breakers are used with 14 gauge cable for general purpose lighting and receptacle circuits. 20 amp breakers are used with 12 gauge cable for heavier loads such as microwave ovens and dishwashers. 30 amp breakers are used with 10 gauge wire for an electric water heater or clothes dryer. A large kitchen range will require a 50 amp breaker and 6 gauge wire.
A safety device used to interrupt the flow of electricity in case of a short or overloaded circuit. These can be made of glass with a threaded base for 120 volt branch circuits, or a cartridge design with a copper cap on each end for 240 volt circuits. Fuses are found mostly in older homes with small, 60 amp service panels.