A receptacle unit includes a body having multiple slots and a wire connection portion is formed to the body. The wire connection portion is exposed from the body and is electrically connected to the slots. A housing is mounted to the wire and connected to the body. The housing is mounted to the wire connection portion to provide electrical isolation to the wire connection portion. Multiple connectors are connected to the body and an isolation member is located to provide isolation to the connectors. Multiple wires are replaceably connected to the connectors.