Norimitsu Ichikawa and Kazuhiko Taniguchi
Fatal accidents can occur when workers do not use insulating safeguards to prevent electric shocks.Many of these accidents are caused by contact with low and high voltage objects. These accidents may not be entirely eliminated through the use of insulating safeguards. Workers often fail to use msafeguards because they are difficult to use in tight work situation. Therefore, a more suitable insulating safeguard is required to prevent these accidents. We study the design of an insulating safeguard based on theDC breakdown voltages of two insulating materials (a PMMA plate and an insulating sheet of EVA). The breakdown voltage of the insulating sheet exhibits the polarity effect though the characteristics of the PMMA plate are slightly dependent of the polarity of the applied voltage. The results of this study will be useful in the basic design of insulating safeguards.
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