All the lights in the house suddenly have low light. What is the reason why they can't be turned off?

Reason one: the switch is connected to the zero line, which leads to the inversion of the zero line of the live wire.

In fact, electricians hardly make such mistakes, but in fact, this kind of problem often happens, and the zero fire line in the whole house is upside down. This situation is generally caused by the change of zero line fire line outside the house. As long as you change the bus at the home main switch, you can solve the problem.

Reason 2: The neutral wire is charged.

This situation is very common, which is why both lines will light up when you measure with an electric pen. The neon bulb of the electric pen will light up as long as there is a voltage of twenty or thirty volts, so the general electrician still likes to use a multimeter. Generally, neutral line is charged because of transformer neutral drift, not zero voltage. You can do an experiment. If you touch the zero line to the wall and measure it with an electric pen, it won't light up.

Related instructions

Zero fire line inversion processing method:

First, pull down the main switch of the light to see if the light is still on. If it is still on, it may be from the socket breaker, and then pull down the socket switch, which should not be turned on.

Second, after the fault is confirmed, turn off the fault light switch and remove the switch with the power switch down. Test whether there is electricity with an electric pen to determine whether it is the zero line or the live line. If you really connect the zero line, just connect the live wire to the switch. Power must be cut off during operation, and power can be sent temporarily when it is judged whether it is live wire or zero wire.

Neutral line live treatment method:

First, it can be said that 90% of LEDs are lit because the neutral line is charged, so how to solve it? Repairing the transformer is definitely not practical, so we can only work hard on the lamp. You can insulate your LED lamp from the wall and install a plastic pad between the bottom plate of the lamp and the wall (I tried it in actual installation and the effect is obvious).

Secondly, there is another way to install relays in lamps and disconnect the zero line at the same time (because the zero line is directly connected in the installation of lamps and lanterns). This way can completely solve the problem of weak LED light.