Experimental consideration of electrostatically induced voltage generated by approach and isolation of charged body

Electrical equipment within a metal box may malfunction by an electrostatically induced voltage. The induced voltage of the metal box is changed by the movement of a charged body, such as a charged human body. The induced voltage of the metal box generated by the approach and isolation of the charged body is experimentally studied in this work. In the experiments, the depth of a metal box is changed, and the result shows that the induced voltage of the metal box generated by the isolation of the charged body is higher than that generated by the approach of the body. The former induced voltage of the metal box becomes the voltage of approximately -400% of a latter induced voltage in this experimental condition. Electric charges of metal boxes are somewhat dependent of the depth of the boxes. These results will be useful to design electrical equipment capable of preventing equipment malfunction and failure.