A load control system for controlling the amount of power delivered to an electrical load, the load control system comprising: - a main load control device configured to be coupled in series between an AC power source and an electrical load, the main load control device comprising means for controlling the amount of electrical current flowing from the AC power source through the electrical load, the main load control device being adapted to receive external, electrically signaled messages during a first fraction of a half-cycle of a voltage signal provided by the AC power source; and - one or more remote load control extension devices, each of the one or more remote load control extension devices having no more than two external electrical connection terminals including an electrical line terminal (L, 401) and a second terminal, the load control system being characterized in that: - each of the one or more remote load control extension devices comprises a respective single port (Ext_Ctrl) as the second terminal for establishing a communication path and a charging path via a respective single switched electrical wire connection between the main load control device and the respective remote load control extension device, - each of the one or more remote load control extension devices are configured to be coupled in series between the AC power source, through the electrical line terminal (L, 401), and the electrical load via the main load control device, through the single switched electrical wire connection, each of the one or more remote load control extension devices being remotely installed from the main load control device, the one or more remote load control extension devices each comprising means for transmitting the electrically signaled messages along the communication path during the first fraction, and the one or more remote load control extension devices comprising each an internal means for drawing, during a second fraction of a half-cycle of the voltage signal provided by the AC power source, the second fraction being different from the first fraction, an electrical charging current along the charging path that extends through at least the main load control device, the electrical charging current being suitable for supplying electrical power to at least the respective means for transmitting the electrically signaled messages, and - wherein in response to at least one of the electrically signaled messages transmitted by one of the one or more remote load control extension devices and received by the main load control device during the first fraction, the main load control device is configured to adapt the amount of electrical current flowing from the AC power source through the electrical load. - a main load control device configured to be coupled in series between an AC power source and an electrical load, the main load control device comprising means for controlling the amount of electrical current flowing from the AC power source through the electrical load, the main load control device being adapted to receive external, electrically signaled messages during a first fraction of a half-cycle of a voltage signal provided by the AC power source; and - one or more remote load control extension devices, each of the one or more remote load control extension devices having no more than two external electrical connection terminals including an electrical line terminal (L, 401) and a second terminal, the load control system being characterized in that: - each of the one or more remote load control extension devices comprises a respective single port (Ext_Ctrl) as the second terminal for establishing a communication path and a charging path via a respective single switched electrical wire connection between the main load control device and the respective remote load control extension device, - each of the one or more remote load control extension devices are configured to be coupled in series between the AC power source, through the electrical line terminal (L, 401), and the electrical load via the main load control device, through the single switched electrical wire connection, each of the one or more remote load control extension devices being remotely installed from the main load control device, the one or more remote load control extension devices each comprising means for transmitting the electrically signaled messages along the communication path during the first fraction, and the one or more remote load control extension devices comprising each an internal means for drawing, during a second fraction of a half-cycle of the voltage signal provided by the AC power source, the second fraction being different from the first fraction, an electrical charging current along the charging path that extends through at least the main load control device, the electrical charging current being suitable for supplying electrical power to at least the respective means for transmitting the electrically signaled messages, and - wherein in response to at least one of the electrically signaled messages transmitted by one of the one or more remote load control extension devices and received by the main load control device during the first fraction, the main load control device is configured to adapt the amount of electrical current flowing from the AC power source through the electrical load.