As a certified EE I totally support your warning. The problem with mains voltage hobbyism is that it is really easy to build something that works fine in 99% o

As a certified EE I totally support your warning. The problem with mains voltage hobbyism is that it is really easy to build something that works fine in 99% of the situations until it encounters those 1% situations that the hobbyist couldn't plan for, doesn't have the knowledge of, doesn't has the tools for etc. The problem with that is, that if you're unlucky it can literally ruin multiple lifes at once. Experimenting is one thing (know the risks and go ahead), but putting things out there in circulation is an entirely different can of worms. I had to learn all of the VdE rules and many of them have been written in catastrophic failures and house fires. And I thought I knew a lot when I started learning those rules, and oh boy was I wrong. All electrical appliances interact with your house wiring, and there can be very weird fault conditions between your appliance and your house wiring, that are very hard to predict (and even harder to test for) by a "electricity comes out of the wall"-hobbyist.