Led light will turn off after turning off the switch, secretly tell you the solution

When the LED light is installed, it is found that there is a faint light after turning off the power switch.

And it’s always on, it won’t turn off the lights. The electrician who installed the lamp was anxious, and thought it was a quality problem with our LED lamp. Actually not, for a qualified electrician, this is a common-sense mistake that should not be made.

Why is it always lit after the power is cut off?

Reason one: Because the electrician is disconnecting the electric switch, the power-off switch is connected to the neutral line, not the live line. The electrician knows that the power-off switch must be powered off with a live wire, otherwise there is a danger of electric shock. However, the electrician complaining today actually turned off the power with the zero line. After the power is cut off, the live wire continues to supply power to the LED drive power supply, which will cause the LED light to have a faint light after the switch is turned off. I hope that my friends will pay special attention to similar situations in the future. Safety first.

Reason 2: A lot of headlights with segments must be divided into zero fire lines, which means that the red line (or gray) on the segment is connected to the fire line as much as possible. This is the safest.

In the vast majority of cases, the light switch is installed on the zero line. When the switch is in the off state, the live wire is still connected, and the light is always in the charged state, so the light will be slightly bright after the light is turned off. This kind of situation does not only appear in the LED, but if this is the case with ordinary fluorescent lamps, it will appear slightly bright.

In this case, first confirm the fault and then process it.

First, first pull down the main lamp switch to see if the light is still on. If it is still bright, it may be the power taken from the outlet circuit breaker, and then the socket switch should be pulled down, it should not be lit.

Second, after confirming the fault, with the power switch pulled down, turn off the fault light switch and disassemble the switch. Use an electric pen to test for power and determine if the neutral or hot line. If you are actually connected to the neutral line, then you can connect the live line to the switch. (When operating, be sure to turn off the power, and you can temporarily send power when you judge the live line or the neutral line).

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