Special edition paper

When conducting work that has to be done with power of overhead contact lines turned off, personnel first confirm that the contact wire power is turned off by touching those wires approx. 5 m above the ground from the wayside with a voltage detector. Then they attach a grounding device to the wires (voltage detection and grounding). In large-scale station yards into which many tracks enter, however, it is difficult to turn off electricity to all feeders circuits together. Therefore, work often has to be done with some wires live and others not. Moreover, personnel sometimes moves from the work site where they performed voltage detection and grounding to another site. When working at a site with many feeders in complex wiring, there is a possibility that workers enter an area with live lines by mistake and are electrically shocked. In order to prevent such accidents, there was demand for developing a tool with whic