Comment by ZYbCRq22HbJ2y7

> You don't when it comes to mains electric

You definitely can. Any residential home in the US was probably built by those who had no formal training on "mains electric" and was inspected by a building inspector who also knows nothing really about electricity, but can follow guidelines.

It isn't difficult to buy devices that are built and rated to interface low voltage with "mains electric".

The issue is when you arrogantly assume you know things you don't, and that can harm you regardless of the application. Yet, that is often a path for some to learn and become experts or cautionary tales.

IMO, the gatekeeping risk-averse shouldn't stand on soap boxes attempting to dictate the lives of the curious.