Abstract: A master dimmer and one or more dimming control modules use embedded pulse width modulation signal to carry out phase control dimming for lighting equipment. Communication between the master dimmer and the dimming control module(s) is carried out on a communication wire which connects between them. Encoded control signals are embedded onto the voltage carrying communication wire for the communication between the master dimmer and all the dimming control modules. The master dimmer is the only device which connects to the load, such as lamps. Dimming control modules send embedded control commands to the master dimmer and the master dimmer will decode the control commands and then carry out phase control dimming to the load. The combination of master dimmer and dimming control modules provides a simple multi locations dimming control system.