Abstract: A system for controlling multiple electric appliances connected to an AC power line comprises multiple appliance controllers, each of which is connected to a PLC module. Each appliance controller is electrically connected between one of the electric appliances and the AC power line and is operable to control and provide power to the connected appliance. Each appliance controller receives, through the AC power line, appliance control signals containing an appliance address code, which is uniquely assigned to the appliance controller. In response to the appliance control signals, the appliance controller changes the status of the appliance to which it is connected. The PLC modules are contained in modular switch boxes. Each PLC module is programmable to transmit appliance control signals to one of the appliance controllers using the assigned appliance address code.

Abstract: A base module having a cylindrical female socket mates with a cylindrical cartridge plug connected to the electrical fixture. The base socket contains at least three circular or annular electrical contact strips, which are electrically connected to at least hot, neutral and ground wires of the building's circuitry. The male cartridge plug, which is configured to be rotatably insertable into the female base socket, contains at least three spring-loaded pop-up electrical contacts, each of which engages one of the base contact strips and remains continuously so engaged through a full 360° rotation of the cartridge plug. The plug's pop-up contacts are electrically connected, through the plug casing, to at least the hot, neutral and ground terminals of the electrical fixture. Rotational adjustments of the fixture are accommodated by rotating the cartridge plug within the base socket.

Abstract: A base module having a cylindrical female socket mates with a cylindrical cartridge plug connected to the electrical fixture. The base socket contains at least three circular or annular electrical contact strips, which are electrically connected to at least hot, neutral and ground wires of the building's circuitry. The male cartridge plug, which is configured to be rotatably insertable into the female base socket, contains at least three spring-loaded pop-up electrical contacts, each of which engages one of the base contact strips and remains continuously so engaged through a full 360° rotation of the cartridge plug. The plug's pop-up contacts are electrically connected, through the plug casing, to at least the hot, neutral and ground terminals of the electrical fixture. Rotational adjustments of the fixture are accommodated by rotating the cartridge plug within the base socket.