Is dust in the rosette dangerous?

Is dust in the rosette dangerous?

When installing outlets in an apartment in the socket, it was not possible to remove all building dust (from sanding gypsum plaster), because no vacuum cleaner. Is it dangerous?

Help identify the machines in the shield

Help identify the machines in the shield

Hello, please tell me what kind of machines? Stand in the ventilation shield. I suspect that this is some kind of RCD, but I would like to hear an authoritative opinion.

Why does the subwoofer not work?

Why does the subwoofer not work?

I have a microlab speaker - two speakers and a subwoofer. At first everything worked, but after a while the sound disappeared. Is it the cord or the connector itself?

One-button turn-on of lamps

One-button turn-on of lamps

How to implement a scheme of alternating switching on of bulbs with one switch. They pressed it for the first time - the first light came on, let it go - it went out. Etc.

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