This rule has been in place for over two years and I can't find a single other person that has heard of it (including inspectors). Multi-volt motors have been showing up to 208 volt jobsites for a while now. Their nameplates no longer list 208 as an acceptable voltage. Does everybody else just tie equipment in regardless of what nominal voltage is present or what the nameplate states? The only reason I am aware of this relatively new rule is because calling the equipment manufacturer is common practice for me. When other electricians have a question, do they just push it to the back of their minds, throw the switch, and let it buck? I had to re-tap a transformer on the same job mentioned above. It was only 8% high and I figured that should be fine. However, I called the equipment manufacturer to verify and was surprised to find that their recommendation was to bring the increase to within 4%. This water cooled condenser would have worked if I just ignorantly powered it up and walked away. However, certain components were said to prematurely fail if I had left the voltage as it was.
