FID clutch
Almost every facility has a FID switch, virtually no electrical installation without it, which is now required by law. The function of the FID (RSD) switch is protection against electric shock (direct and indirect contact) and additional protection (fire protection). Immediate touch implies e.g. a person grabs at a bare live conductor, and by indirect contact eg. the person is touching conductive parts that are energized in the event of a failure.