I believe that the NEC is talking about separate metal control enclosures connected together by screws, bolts and or wire connectors, or even just abutted up against each other. You have the option of using an approved common grounding bus that some manufacturers offer that runs through all the...
I have a 460 volt 3 phase motor with 12 leads. 4to6, 5to8 & 6to9. When I do a continuity check with all the other leads unhooked I get continuity across 1 & 10. Nothing on the other leads. Is this a good reading?