An electric safety switch that automatically opens a circuit when excessive amperage occurs.

A box in which the wires from the meter are connected to individual circuit breakers, which are connected to separate circuits for distribution to various locations throughout the building.

An instrument used to measure electric power.

An electrical connection to the earth.

An electrical connection used to plug in devices. A duplex outlet, with two outlets, is the typical wall plug.

A unit of measure of power.

Allows switching from one location

Allows switching two circuits from one location

Allows switching a circuit from two locations

Required by code in potentially wet locations. (stops the current) when short circuit occurs.