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.
This page offers some options for locating an electrical source for a new wall receptacle or a light fixture, and running the new cable required. To make this job easier, it’s best to have a second person at one end or the other of a new run, to sight the end of the fish tape and help guide cable. Also be sure to always turn off the affected circuits before working on household electricity.
Attach the wires to a new switch connecting the hot source to the bottom terminal and the wire running to the light to the top terminal. On a receptacle the black wire from the source goes on the hot, brass colored screws and the white goes to the neutral, silver colored screws. If there are two sets of wires on a receptacle, keep them in sets using the top terminals for one and the bottom terminals for the other set.
Try to remove the wallboard cleanly so it can be reattached when you’re done. The baseboard can be reinstalled without replacing the wallboard, but this will create easy access for pest such as rodents, as well as drafts from cold air during the winter.