I agree with Don that the words ' double locknuts ' are not used.
Would not 344.2 " - - - when installed with its integral or associated couplings and appropriate fittings. - - -."
And
300.10 " - - - shall be connected to all boxes, fitting, and cabinets so as to provide effective electrical continuity. - - - raceways - - - shall be mechanically secured to boxes, - - -."
in effect mandate double locknuts for the appropriate installation?
The additional Bonding Bushings etc. of 250.92(B) would be in addition to the double locknuts.
