| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an insertion type connection unit having a function for checking whether a normally-operable wiring state is secured for a plug socket to which the insertion type connection unit is connected.SOLUTION: An insertion type connection unit has plug blades which are inserted in connection with plug reception pieces at the respective poles provided to a receptacle, a power supply circuit which is electrically connected to the plug blades and acquires driving power, an earthquake sensor which is supplied with power from the power supply circuit, detects the quake of the earthquake and outputs an output signal, an earth fault current generator which receives the output signal from the earthquake sensor and generates earth fault current for a receptacle circuit, and a polarity check unit for measuring the voltage between the poles at the respective plug reception pieces to check the polarity.</p> |
