wiring help please

[Taylortwocities]

The only warning that has ever been required on light switches is to warn of the presence of different phases ie 400 volts.

Thats just not true. The more than one source has been a reg for at least 10 years. Its up to you if you want to be selective about which regs

"make things safer

I would prefer to do otherwise.

MK Grid switches (and others) include the required label. Put it in the switchbox.

But maybe they do things differently after a few vodkas where you claim to live.