| 摘要 |
PURPOSE:To easily mount a terminal device by connecting in series a voltage drop generator to a load unit switch, connected to a power wire, and taking out voltage from both ends of the voltage drop generator or the switch in accordance with on-off operation thereof. CONSTITUTION:When a switch 4 and a load 3 are connected to a power cable 1 through power branch cables 2', 2'', a voltage drop generator 6 is connected in series to the switch 4. When the switch 4 is placed in an on-condition, voltage 7 across both ends of the voltage drop generator 6 or voltage 9 across both ends of the switch 4 and the voltage drop generator 6 is taken out. When the switch 4 is placed in an off-condition, voltage 8 across both ends of the switch 4 or voltage 9 between ends of the switch 4 and the voltage drop generator 6 is taken out. The taken out voltage 7 or 8 and voltage 9 are supplied to a terminal device as a power supply thereof except in the drawing. In this way, the terminal device can be easily set up freely in a desired position in the vicinity of the switch or in the vicinity of the load distant from the switch. |
