如错误操作有：运行状态拉合小车、热备用状态合地刀（挂地线）、检修状态合小车等。
Normal positions: running condition, hot standby mode, cold standby mode, maintenance condition, and trolley operation conditions, etc.
当煤气发生炉检修时，煤气用户的车间允许减少或停止供应煤气的情况下，可不设备用。
Set aside. When gas occurrence boiler overhaul, gas users workshop allowed to reduce or stop supplies gas cases, don't equipment use.
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