打开外壳 meaning in English

uncoat

Limited service controller " on - off " switch must be in the extreme “ off ” position to open the enclosure door
在打开外壳门之前，要保证开关处于“关闭”位置，否则，不能对控制装置的开关进行维护修理。
Open the door of the enclosure and inspect the internal components and wiring for any signs of frayed or loose wires or other visible damage
打开外壳门，检查内部元件和线路是否有磨损的痕迹、线路是否松开，或其它可见的损坏。