This, already 49 in a row, question with just such a title was asked by the reader Anton. And I continue to publish for the "question-answer" section. Let me remind you that if you have your own answer to a question, then write it in the comments below. I and other readers will be happy to read it.
I quote the text of the question verbatim:
Hello. The question is this: the light in the stretch ceiling began to flicker (all 6 lamps), sort of like a whirlwind in the switch. I changed it to a new one and everything went away, and after 3 hours everything was back again. What is the reason?
I reviewed the issue and advised Anton within the framework of my knowledge and qualifications as follows:
Good day!
For a better understanding of the reasons for what is happening, it would be good to see the power supply diagram of these lamps. The most likely causes of flickering light are the following:
- Bad contact in the chuck - in case of insufficient adherence of the contacts of the base to the lamellas of the cartridge, the junction will begin to heat up, the transition resistance will increase and flicker will occur. And when the lamps are connected with a loop, all lighting devices behind the first light bulb will flicker. To eliminate it, it is enough to bend the contacts in the cartridge or replace the cartridge with a new one.
- Faulty wiring - in the process of aging of cable and wire products, the ends of the cores are oxidized, due to which the transition resistance at the junction increases. This problem is especially inherent in twists in junction boxes, so it is worth checking in them first.
- Neighbors use powerful atypical equipment - for example, if a powerful heater is turned on in a neighboring apartment during the heating season, it is likely that you will observe the flickering of lamps. In some rooms there are more, in others less, which largely depends on the local characteristics of electrical equipment and its distance from a source of atypical load.
Here I do not consider the option of problems with the switch, since I hope for the correct installation - all clamps (terminals) and cores are intact and have good contact. If, however, the switch was short and you did not find and did not eliminate the cause, it may be worth going through the switch itself and the adjacent conductors.