The office has a three hole wall plug with poor contact, and the home has a two hole wall plug with poor contact, which can be replaced to give full play to the waste heat.
To be on the safe side, remove a wire from the old socket and connect it to the "new" socket. A red line should be the live line, and a blue line should be the zero line. But then something strange happened. The indicator light of the patch panel plugged in this wall is on, but the electric fan plugged in the patch panel shows no sign of power on. The water dispenser is powered on, but it is powered off and restarted as soon as it starts to boil water... After trying to charge the mobile phone, it is found that the power is cut off immediately after charging, and the power is cut off immediately after resuming charging. It's the same way to plug the old wall back in, which makes me start to doubt life.
It was doubted whether the wire was not tightened, leading to poor contact, or the live wire and the zero wire were connected reversely. After a lot of trouble, there was still a black wire in the wall, which instinctively thought was the ground wire. Because I am dismantling the old and installing the new, I come here one by one, and I don't think I will connect the wrong wire at all. I couldn't find the cause for a long time, and I also wondered whether it was caused by no grounding wire (black wire), or whether the black wire was the zero wire (I didn't doubt that the red wire was wrong because it was electrified by it, and I was 100% sure that it was the live wire). But the black wire was tightly pressed against the wall before, and the exposed part was not pressed by the terminal. I really don't believe it was connected before. I'm not sure about the role of the black line, and I dare not try at random. Finally, I plugged in and removed the wall beside it to see how it was wired, and found that the blue line was the ground wire and the black line was the zero line.
Reconnect the cable, everything is normal, and I feel that my strange experience has increased. I really don't know how this wall was connected before it was plugged in. I'm very sure that when it was disassembled, it was blue and red, and the middle ground wire was empty. I still recovered it, but it was useless. The only possibility is that it connected the black wire to the ground wire before, and then the black wire fell out when I pulled the wall out. So, it can also be used if the ground wire and zero wire are connected reversely?
