All 3 phases are equally dangerous to touch! If there is a ground wire, that is (ideally) safe to touch, but there is no neutral wire in a 3 phase system. All 3 wires are equally "hot". Edit: Although ...

First on the electrical wire color code is black. “Black wires are most used as ‘hot’ wires in residential systems,” says master electrician Allyson Saling with Frontdoor home services app. “Hot or ...