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在建筑电气设计中,常有几个不同的房间的抽风柜公用一个风机。各风柜旁要分别装控制按钮,多是将起动按钮并接、停止按钮串接的方式来操作磁力起动器而控制风机的。实践证明这样接线是有缺点的,如甲处有人在风柜处工作,正需要抽风,而乙处的工作已完,就顺手将风机停了,使甲处的有害气体排不走,需要重新开动风机。还会出现另一种情况:当自己的工作完了后,还认为别处可能需要抽风,而不再操作停机按钮了。据某科研单位介绍:“楼里无人上
In building electrical design, there are often several fans in a common room with a common fan. Each control cabinet should be installed next to the control button, and more than the start button is connected to the stop button in series to operate the magnetic starter to control the fan. Practice has proved that this wiring is flawed. For example, if someone is working at the air locker at office A, he or she is in need of ventilation. When the work at office B is finished, the wind turbine is stopped and the harmful gas in A is not allowed to drain. Turn on the fan. There will be another situation: When your work is over, you also think that there may be a need for ventilation elsewhere, and no longer operate the shutdown button. According to a scientific research institute: "No one on the building