TOP TRANSFORMER 400V TO 230V SECRETS

If your 3-prongs are angled so as to be able to be plugged into a 3-prong 50A receptacle Then you definitely are proper in that it would have to have a constructed-in jumper as well as 120V neutral & floor might be tapped off precisely the same wire. I do not see how the products could have obtained its CSA listing if which was the case.  Customer