Abstract: A mounting base apparatus for an electrical power measuring device such as a watt-hour meter, that is especially adapted for use in residential applications and providing a lightning arrester for the mounted meter. The apparatus includes one piece molded plastic a one piece molded plastic base structure including a circular base having a forwardly extending tubular side wall for forming a partially enclosed cavity. The tubular side wall terminates in an external flange forming a substantially planar circular surface having a concentric opening for receiving the watt-hour meter. Mounted on the base within a partially enclosed cavity formed by the side wall and base are a plurality of electrical terminals. The terminals receive a corresponding plurality of blade terminals on the watt meter to electrically connect the watt-hour meter.

Abstract: A locking ring formed of a plurality of curved clamp portions connecting in an end-to-end relationship for securing an electrical power measuring device with a mounting base is disclosed. The semi-circular clamp portions are molded from a single piece of plastic, are identical in construction and are fully interchangeable. Each clamp is preferably formed with a semi-circular curved arc body having a male connection at one end and a female connection at the other end. The male end is formed with a pair of projections of which the first male projection serves as an alignment guide during make-up and use while the second male projection carries a movable latch shoulder for effecting the end-to-end connection with the adjacent mating clamp portion. The female end includes a housing having a central opening with separated first and second entrances formed by a roof mounted lug.