Thanks for posting this, something that was drilled into my head some time ago by someone [an old timer] I worked with. Now when I call things out this way or go to show someone why its not 120/208 [for a three phase four wire system] they give me funny looks like why dose it matter, for the next one can we dissect transformer vector group notation ex. Dyn1 I still get hung up on these need a good cheat sheet. Thanks all, great stuff!!