The switch controls the live wire. When I use a tester to test the neutral wire, it is slightly bright. What's going on?
1, Regarding this issue, the reason for the phenomenon caused by the slight brightness of the neutral wire is generally due to oxidation at the zero wire overlap, resulting in poor contact. However, this situation can be ruled out as a problem of the main line's neutral wire being disconnected. The fault phenomenon and consequences caused by the main line's neutral wire being disconnected or having poor contact are different, and will not be analyzed here.
2, Segmented search and narrowing down the scope, first check whether the neutral wires of the upper and lower pile heads of the switch are normal when the main switch is in the closed position. If the neutral wires are normal and without power, it is usually a problem in the later section of the switch. You can check the joints on the line section by section, find the fault point, and then rewire and wrap it. Because problems usually occur at the connection points of the circuit. The most common occurrence of this situation is usually in old power lines from a long time ago. Nowadays, indoor wiring and installation are very scientific, and this problem usually does not occur.
3, If there is no power on the neutral wire of the upper pile head and power on the lower pile head when checking the upper and lower piles of the switch, this situation is usually caused by a broken switch. The switch can be opened and closed several times, and sometimes the power can be temporarily restored, but the switch should still be replaced in a timely manner.
If the neutral wire on the switch head is also charged during inspection, this situation can usually only be reported by calling for repair, as there may be pole climbing inspection, which users cannot easily solve.
There are two possibilities. Firstly, some wall switches have an indicator light connected across the switch to allow users to easily locate the switch position in the dark. When the switch is turned off, there is still a small current flowing through the switch. Secondly, all fluorescent lamps, whether they are ordinary fluorescent tubes or energy-saving lamps, have a certain delay extinguishing characteristic of their fluorescent powder, called "afterglow". With the advancement of science and the use of liquid crystal displays and corresponding display circuits, it is easy to display events that do not occur simultaneously on the same screen. For example, an electrocardiogram monitor displays a horizontal line that fluctuates up and down with the heartbeat. However, in reality, all the fluctuations on this horizontal line do not occur at the same time, but have a time process. In the past, when there were only CRT monitors, there was only one point that fluctuated with the heartbeat. In order to display a line, a "long afterglow" monitor had to be used, so that the scanned point did not immediately turn off after passing through, but slowly turned off after a long period of time, causing the movement of a point to become a display of a line. The oscilloscope at that time also used the same principle.
The neutral wire is the circuit of all electrical equipment. Due to the presence of a certain resistance in the neutral wire, the higher the resistance or current of the neutral wire, the higher the corresponding voltage on it. So the neutral wire is not completely without voltage, and it is also possible for the measuring pen to light up slightly. Of course, if there is poor contact in the neutral wire circuit, it will cause the neutral wire voltage to be too high. So it's best to measure the voltage with a voltmeter.
