POWER-SAVING SWITCH ON/OFF SYSTEM

PROBLEM TO BE SOLVED: To constitute a power-saving switch on/off system by a method, wherein a transmission unit and a switch unit are connected to a power interconnection. SOLUTION: For example, switch units 2Aa,..., 2Ba,... which have their own switch IDs are attached to a power interconnection 4 between a transmission unit 3 attached to the entrance of the power interconnection 4 and luminaires 1Aa1,..., 1Ba,... Then, a switch ID is received from the transmission unit 3, and whether or not the switch ID matches with the own switch IDs is judged. When they match, a switch turning-off operation is executed. The switch ID generates a specific frequency at the transmission unit 3, and it is superposed on a power line, so as to be transmitted to the switch units 2Aa,..., 2Ba,... At this time, one switch ID is used for each one to two or more luminaires connected to one to two or more switch units constituting a group. Thereby, it is possible to simply obtain a power-saving on/off system of an electrical apparatus.