The sockets have two independent earth terminals so that theycan also be used for ‘clean earth’ installations. The K2746CE and K2947CE alsohave two independent earth terminals for ‘clean earth’ installations.A variety of sockets (see Technical Specification) are fitted with two earth terminalson a common busbar to provide a double earth facility for use when installationsrequire a high integrity protective connection as specified within the latest edition ofBS 7671 which should be referred to for guidance.