A measure of electrical power. The amount of energy produced and calculated by multiplying circuit current times circuit voltage. Remove insulation from wire without damaging the copper conductor. Most strippers have a cutting notch for wire gauges from #10 to #18. Most wire strippers will also have a cutting edge for quick cuts of individual wires.
Anything that resists electrical flow is an insulator. Insulators are needed in electrical circuits to contain the current flow and prevent shorts or electrocution. Vinyl plastic is used as an insulator for household electrical wires.
A long copper bar inside a service panel or breaker box. All neutral and ground wires are attached to a ground bus bar to complete the electrical path. In some cases a service panel may have separate bus bars for neutral and ground.
Two or more wires housed in a protective sheathing is referred to as electrical cable. Armored, UF and NM are all names for household electrical cable. Each cable type is available for different wire gauge. Standard household electrical cable ranges from 14 awg (american wire gauge) to 6 awg, with 14 having the smallest conductors and 6 having the largest. In household electrical systems 14 gauge wire is used for 15 amp circuits, 12 gauge for 20 amp circuits, 10 awg for 30 amps, 8 awg for 40amps and 6 awg for 50 and 60 amp circuits.
A current-carrying wire in an electrical circuit, also called the grounded circuit wire, it serves as the return path for current, and is connected to ground at the service panel. In household electrical circuits the neutral wire is colored white or gray. Some circuits make use of the white or gray wire as a hot wire, when this is done it will be marked with black tape or paint to identify it as hot.
After cutting the hole, put the 2x4 between the joists again and set it so the outlet box sits flush with the finished ceiling surface. Have a helper hold a board over the outlet hole to support the box and keep it at the proper level while securing it in place with two, 3 inch deck screws through each joist. If needed, metal L-brackets may be added at the corners for more support.
Unintended flow of electricity from a circuit to a non-circuit conductor. A short can occur when a hot circuit wire touches anything other than its intended contact. A short will cause a circuit breaker, fuse or gfci to instantly shutoff electrical flow to prevent injury or fire.
A wall outlet box that houses two devices side by side as with two wall switches at a door. Triple-gang boxes are also commonly available to hold three devices in one place.