Unmetered surface power outlets accept male plugs, providing power to electronic devices. These outlets mount on surfaces for quick installation, pairing with external wiring in external channels instead of inside walls. They are used in scenarios where wall material cannot be easily cut, like brick, or in applications requiring temporary power, like construction sites.

Power inlets accept a female plug and accommodate incoming power from equipment like generators or industrial machinery. Power inlets connect to a transfer switch. When engaged, the switch allows the connected equipment to supply power to the system they are plugged into.