Yeah. I thought maybe the author of that post was confusing "three wires" with "three phases". I don't know about the EU, but in the US there's almost always a

Yeah. I thought maybe the author of that post was confusing "three wires" with "three phases". I don't know about the EU, but in the US there's almost always a grounded neutral point on three phase systems, even if the loads are all phase to phase. All the literature I've ever found says corner grounded deltas are "not to be used in new installations", and ungrounded deltas are similarly discouraged.