精品久久国内一区二区三区|99久久夜色精品国产|98久精品国产精品观看无码|国产亚洲精品不卡乱码aⅴ

The distribution box shall be regularly dedusted to keep the distribution box clean. Periodically check whether the connectors in the distribution box are firm to ensure the reliability of the wiring. Check whether the action of the related switch is normal, and replace the abnormal switch timely. Check whether there is rainwater or sand and dust intrusion into the box, and eliminate these dangerous factors. 

　　The distribution box shall be regularly dedusted to keep the distribution box clean. Periodically check whether the connectors in the distribution box are firm to ensure the reliability of the wiring. Check whether the action of the related switch is normal, and replace the abnormal switch timely. Check whether there is rainwater or sand and dust intrusion into the box, and eliminate these dangerous factors.