2 ms·
> Why else do all electrical devices with a metal case or a metal structure have these metal bits connected to ground, if not so that most shorts will lead to t
by lmm 2y ago
> Why else do all electrical devices with a metal case or a metal structure have these metal bits connected to ground, if not so that most shorts will lead to the circuit being closed towards ground?
That predates GFCI, it's to ensure that in the event of a short the metal case/structure will always remain safe to touch by a (presumably grounded) person. Tripping GFCI is just a bonus.
- atoav 2y agoAlso: metal structures can be at different potential than ground for reasons unrelated to the grid (e.g. static electricity). Grounding them helps to ensure they aren't which is especially helpful in environments where people handle sensitive electronics or ignition sources.