By the same token 3? 4W is redundant, so is "Y". Please describe a 3? 4W system having 208V line-to-line and 120V line-to-neutral that isn't a wye connected system...kingpb said:Actually, the "Y" is not optional. The 3ph, 4wire is optional, as it is redundant, since 208Y/120V as written means 3ph, 4W.
...and if you stick to the convention that "Y" is not optional, why do you not write 240Δ/120 3? 4W, or something to signify a delta connected secondary?
I believe your only recourse is to state it is simply a matter of convention... and one which you subscribe to at that.