过去我队在在机埸用电方面,均用一套开关。由于工区分散,路途较远,常因保险丝熔断影响生产。经改为双套开关后,保证了不因保险丝熔断而停止鑽进,同时在修理过程中,也不需停鑽。此外,由于它只适用于过负荷而熔断保险丝的情况,因而若是短路事故或机械事故发生熔断时,则附开关合上时仍然熔断,从而也可以判定电路情况。双套开关的按装方法,如图所示。在主开关侧旁并接一附开关,即成双套开关。平时用主开关供电, In the past, our team used a set of switches in terms of power consumption in the machine. Due to the decentralization of the work area and the long distances, the fuses often affect the production. After being changed to two sets of switches, it is ensured that the drill will not be stopped due to blown fuses, and at the same time, it is not necessary to stop drilling during the repair process. In addition, since it is only applicable to the case where the fuse is blown under overload, if a short-circuit accident or a mechanical accident occurs, the fuse is still blown when the switch is closed, so that the circuit condition can also be determined. Double-set switch installation method, as shown in the figure. A switch is connected next to the main switch side and it is a double switch. Normally powered by the main switch,