移动式机械本身就潜在着触电危险,不能保证安全、可靠地接地。当这种机械运行在高压即480伏时,正如大多数消耗电力的设备一样,能使流经机身的泄漏电流增加。在这时人们已被可能触电的危险包围,不能随便地进行操作(有时是修理)。在任何大的系统上,触电危险可由下列两方面产生,如有可靠的保护系统,必须对这两方面进行保护。 Mobile machinery itself is potentially a risk of electric shock and can not be safely and reliably grounded. When this machine is operated at a high voltage of 480 volts, as with most power-consuming devices, leakage current through the fuselage can be increased. At this point people have been surrounded by the danger of being electrocuted and can not be manipulated (and sometimes repaired). In any large system, the risk of electric shock can be generated by the following two aspects, if a reliable protection system, these two aspects must be protected.