· =Radio Components Standardization Committee 无线电元件标准化委员会[英] · =Relay Control Unit 继电器控制设备 · Research and Development Board(美国)研究与发展局 ..
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安装，更换和修复照明灯具和电气控制及配电设备，如开关，继电器和断路器面板。
Install, replace and repair lighting fixtures and electrical control and distribution equipment, such as switches, relays and circuit breaker panels.
用PLC替代老设备的继电器控制箱，使产品更新换代。给出了替代的一些步骤和方法。
Control case with the relay of PLC replacing old equipment, make produce renew, have given some replacing step and method.
绞线机、合绳机电气控制设备中的时间继电器故障率较高，是影响这类设备正常运行的主要原因。
Higher fault rate of time relay in the electricity control apparatus of strander and closer is the main reason causing this kind of equipment to work off normal.
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