While it may have changed since ?? In allllllllll the years in allllllllllll the jurisdictions where I practiced power distribution engineering ANY CONDUCTIVE/METALLIC JUNCTION BOX REQUIRED BONDING TO THE (bare/green) EQUIPMENT GROUNDING CONDUCTOR. With PROPER bonding and jumping and connection methods there are occasions where the raceway might be used as the Equipment Grounding Conductor HOWEVER I was never a fan of such nor did I specify it.
REGARDLESS if its now NEC required or not, I would still bond any conductive/metallic junction box to the Equipment Grounding Conductor to be on the safe side IF REQUIRED OR NOT,,,,,,,,,,, BUT THATS JUST ME yall are welcome to do as you please. Sure it wiLl work if wired that way or not.......
NOTE HOWEVER 1 !!!!!!!!! If there are NO splices,,,,,,,NO internal connections,,,,,,,,NO actual true junction box use (per NEC definitions),,,,,,,,,, perhaps the NEC definition of a JUNCTION BOX may not apply and its ONLY considered as part of the RACEWAY so each box is ONLY part of the raceway and does notttttttttt require each box grounded ?????????????
NOTE HOWEVER 2 The conductive raceway system (conduit and boxes) enclosing conductors DOES ALL NEED BONDED soooooooooooooo if there exists proper low resistance NEC approved connections (requires special terminations/splices etc) so if the boxes are not bonded still the entire metallic raceway system DOES NEED A CONTINUOUS LOW REWSISTANCE CONDUCTIVE PATH and I question if thats the case or not because of all those the box to conduit connections (which MUST be proper and approved???) may not be proper or approved THAT CUTS IN FAVOR OF BONDING EACH BOX but also the conductive raceway system (conduit and boxes) does need bonding SO THE CONNECTIONS FROM CONDUIT TO EACH BOX IN AND OUT NEED TO BE PROPER
NO WARRANTY but I would still bond conductive/metallic junction boxes to the Equipment Grounding Conductor regardless if absolutely required or not I DONT HAVE ANY CURRENT NEC MAYBE SOME KIND GENTLEMAN HERE CAN LOOK IT UP AND CITE WHETHER ITS REQUIRED OR NOT ??????????????? Maybe with NO splices or connections and NO actual NEC defined JUNCTION BOX,, the NEC does NOT require bonding ???? PROVIDED THAT the entire raceway system (conduit and boxes combined) is all properly NEC approved
Where fire and life safety are concerned you may want to consult the NEC and current practicing professional electricians and engineers in addition to anything posted here ME INCLUDED.
Sorry absent any current NEC I cant answer the question but hopefully someone here can look it up and educate all of us, there are some professional electricians on here who are more NEC current than myself SEE WHAT THEY SAY OR CAN LOOK UP FOR US !!!!!!!!!!!!!!!
John T Toooooo longgggggggg retired EE