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1994年11月,我县农村木工张某,在整修“台式木工多用途机床”（下文简称电刨）拖动电动机破裂的接线盒时触电身亡。笔者闻迅赶赴现场,当时电刨两爪单相电源插头未拔掉,倒顺开关手柄放在中间“停”的位置,测量电动机接线桩头V_1、V_2却有约220伏的电压。此电从何而来?经摇表测量,在排除了倒顺开关老化绝缘击穿漏电的疑点后,阅图即知,事故出于接线毛病。 附图中,倒顺开关接线桩头3与5之间的虚线是电刨制造厂家,在装配接线时另加焊的一根连接线。为了便于了解单相电容起动电动机内部结构原理,在接线盒图中
In November 1994, Zhang County, a rural carpenter in our county, electrocuted and died while renovating the “Desktop Woodworking Multipurpose Machine Tool” (hereinafter referred to as the planer) dragging the junction box of a motor rupture. The author Xun Xun rushed to the scene, when the planer two-prong single-phase power plug is not unplugged, inverted switch handle on the middle of the “stop” position, measuring the motor wiring pile header V_1, V_2 has about 220 volts. The electricity come from? Shake table measurement, ruled out the inverted switch aging insulation breakdown leakage doubt, reading that knowledge, the accident out of wiring problems. In the drawings, the inverted switch wiring between the dotted line 3 and 5 is a planer manufacturer, an additional welding line in the assembly of wiring. In order to facilitate understanding of single-phase capacitor starting motor internal structure principle, in the junction box diagram