For billing purposes, electric utilities use electric meters installed at customers' land to measure electric energy delivered to their customers. Every home or office contains electric meter and the electric meter are usually placed in the meter box. Most importantly, a meter box houses an electric reading meter, the device that measures electrical consumption. Other components within the box include the main switch, fuses and circuit breakers such as the residual current device (RCD), which has the ability to control and stop the flow of electricity.