![]() ![]() This is a very different thing than in DC electronics. What we call "ground" in mains wiring refers to that safety shield. And also to allow enough current to return to source that it trips circuit protection systems - overcurrent trip devices (circuit breakers) or ground fault detection systems (GFCI/RCD). This safety shield is not a conductor (meaning: power should never flow through it normally.) If it does, something is dreadfully wrong, and the goal of the metal is to keep the misguided current flow away from humans. we also wrap the entire kaboodle in a metallic safety shield. Separate from the power conductors proper, the "positive" and "negative" as you call them (wrongly). That changes a whole bunch of stuff, also it can kill you. ![]() Here, we work in AC, because it is transmittable over long distances. (which actually makes it the current source, but nevermind that.) They use the term "GND" or "ground" to refer to Vss, the current return or common, typically the negative in a 5/12V system. I gather that you hail from the world of low voltage electronics, breadboard spaghetti and all that 5 volt stuff.
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