Single-phase sockets[clarification required] have two existing-carrying connections to the facility source circuit, and could even have a 3rd pin for a security relationship to earth floor. The plug is usually a male connector, generally with protruding pins that match the openings and female contacts inside a socket. Drive button switches https://typesofmicrophones35790.blogsuperapp.com/29870331/the-best-side-of-types-of-electrical-plugs-usa