Hmmm... that only covers requirement for box or fitting to be explosionproof.
Hmmm... my 501.30 is on grounding and bonding.
How would you bond a sheet metal box with either a conduit or MC installation? It can certainly be done compliantly for either wiring method but most would use a double-locknut or a locknut bushing type bond on a sheet metal enclosure without a second thought when they understand explosionproof isn't required. CMP14 has been absolutely paranoid about bonding for many many Code cycles - even in Division 2 (all Classes and IS systems BTW). Don't know about now, but I don't see any current proposals to change that position.
I understand the concern, but see it as a consequential issue to the OP... meaning MC and rigid to the same box is not prohibited, but bonding the rigid and MC armor must be ensured as required by 501.30.
That's correct. It's usually overlooked though when someone generally unfamiliar with Hazardous Location installations simply assumes that since Section 501.10(B) and other Sections permit many nonexplosionproof enclosures in Division 2 that grounding/bonding for what would otherwise be Article 250 compliant in an unclassified installation would also be suitable in Division 2.
Basically a locknut on the outside and a treaded bushing on the inside of an enclosure.
IMO, it would.
