Patent ID: 8471687

Claim:
A load control system for controlling the power delivered from an AC voltage source to an electrical load, the system comprising: a load control device adapted to be coupled to the electrical load for controlling the power delivered to the electrical load, such that a load current flows from the AC voltage source to the electrical load through the load control device, the load control device comprising a first current transformer having a primary winding adapted to be coupled in series electrical connection between the AC source and the electrical load, such that the primary winding of the first current transformer conducts the load current, the load control device further comprising a first communication circuit coupled to a secondary winding of the first current transformer for receiving message signals; and a two-wire remote control device comprising a second current transformer having a primary winding adapted to be coupled in series electrical connection with the primary winding of the first current transformer between the AC source and the electrical load, such that the primary winding of the second current transformer conducts the load current, the remote control device further comprising a second communication circuit coupled to a secondary winding of the second current transformer for transmitting the message signals; and wherein the primary windings of the first current transformer and the second current transformer are operable to conduct a communication loop current, the first communication circuit operable to receive and the second communication circuit operable to transmit the message signals via the communication loop current, further wherein the load control device comprises a first capacitor coupled in shunt electrical connection with the load, such that the first capacitor and the primary windings of the first and second current transformers are operable to conduct the communication loop current.