To increase safety by connecting a conductor plate for making connection to a pin for grounding to a grounding wire extension conductor, and by providing a detection part for detecting whether a detection wire is connected to the grounding wire extension conductor or not.
A conductor plate 9a is connected to a detection wire 15, and a conductor plate 9b is connected to a ground wire 4 for connecting to a ground extension conductor 8a where the ground wire 4 is extended. The continuity/non- continuity between the detection wire 15 and the ground wire extension conductor 8a is made by a detection part 16. At the detection part 16, the series connection of a current generation part 17 and a load 18 is inserted between an end that is not connected to the conductor plate 9a of the detection wire 15 and an end that is not connected to the conductor plate 9b of the ground wire extension conductor 8a, and a load voltage detection part 19 that detects the voltage across the ends of the load part 18 is provided, thus preventing an operator from using a feeder system without knowing the possibility of electric shock and a burn while the ground path has been broken and hence achieving an extremely safe feeder system.
GOTO KIYOSHI
KUNIMOTO YOICHI
