We had commercial garage doors that were being replaced , motor assembly overhead drive . I initially kept all wiring except the wiring tail to new assembly. A day into my work I was told that I would have to install a 3 phase 480 v , I was putting 3 pole switches up high adjacent to the motor where it was before . I knew there was nothing wrong with what I did . I can`t find in the cord where it tells you readily accessible . I know there is an exception . where ??