Switch to control the fire wire with a pen to test the zero wire a little bit of light what is the matter?
First, for this problem description, because the zero line is slightly bright, the cause of this phenomenon, generally is the zero line lap at the oxidation phenomenon, resulting in poor contact, but this situation can be ruled out is the main line zero line disconnection problem, because the main line zero line disconnection or poor contact, resulting in the failure phenomenon and the consequences of the same, here will not be analysed.
Second, segmented search, narrow the scope, first check the master switch in the closed position, the switch up and down the pile head zero line is normal, if the zero line is normal without electricity, generally is the switch after the section of the problem, you can check the joints on the line section by section to find the fault point after rewiring and wrapping can be. Because the problem is generally in the line connection. This situation occurs most, usually a long time ago, the old power lines, now the indoor wiring and installation are very scientific, generally will not appear this problem.
Third, if you check the switch up and down the pile, there is no power on the pile head zero line, under the pile head power, this is generally a bad switch, you can open and close the switch a few times, and sometimes can be temporarily restored to the power, but should be replaced in a timely manner switch.
Check if the switch on the pile head zero line is also charged, this situation generally can only call the telephone repair, because there may be boarding inspection, the user can not easily be resolved.
There are two possibilities, first, some wall switches in order to allow users to find the switch position in the dark can also be smooth, across the switch with an indicator, when the switch is off, this indicator still has a small current through the switch. Secondly, all fluorescent lamps, whether ordinary fluorescent tubes or energy-saving lamps, the phosphor has a certain time-delayed extinction characteristics, called "afterglow". Nowadays, with the advancement of science, liquid crystal displays and corresponding display circuits, it is easy to display things that do not happen at the same time in the same screen. For example, an electrocardiogram (ECG) monitor displays a line that fluctuates up and down according to the beating of the heart, but in fact all the fluctuations in this line are not the same thing happening at the same time, but there is a time process. In the past, when there was only a CRT monitor, there was only one point that fluctuated with the heartbeat, and in order to display a line, it was necessary to use a "long afterglow" monitor, so that the scanning point did not go out immediately after passing by, but rather after a longer period of time and then slowly go out, which made the movement of a point into a line of display. There were also oscilloscopes at that time which were based on the same principle.
Zero line is the circuit of all electrical equipment, due to the existence of a certain resistance of the zero line, the greater the resistance of the zero line or the greater the current of the zero line, the higher the corresponding voltage above. So the zero line is not completely no voltage, the stylus is slightly bright is also possible. Of course, if the zero line circuit has poor contact, etc., will make the zero line voltage is high. So it is better to use a voltmeter to measure the voltage.
Transformer out of a phase of the fuse will also cause the zero line with an electric pen to measure the light, when there is a motor burned out in the line far out there is a phase through the motor grounded will also cause the electric pen to measure the zero line light. Zero line disconnected power supply through the appliance will also measure the zero line with electric power pen is brighter.
It is very simple, as long as the zero circuit is good conduction, it is impossible to appear this phenomenon. This phenomenon is sure that the zero circuit somewhere there is a break or poor conduction or stringing of electrical appliances. The solution is to disconnect the zero circuit or poorly conductive part of the connection, if a circuit into the two appliances, cut out an appliance, only one appliance can be retained.
