Most likely just a listing and/or approval issue....but those can be a real issue when there is some type of incident that ends up involving lawyersWhen that connection is 2 or 3 bolts, if the spacing matches, is there plausibly a functional issue, or is it just a listing issue (it will work but it hasn't been tested)?
OP didn't say that there was a panel(board) or bus involved, just an enclosureThe enclosure is not the issue...the connection between the bus and the breaker is the issue.
You either use a breaker that is specified by the panel manufacturer for that panel bus, or you use a different brand breaker that that has been "classified" for use with that panel bus.
This is correct. We actually want to use a UL-listed Susol 400A MCCB, but we cannot source a listed enclosure made for it.I agree, it sounds like maybe he's wanting to replace an enclosed 400-amp breaker. Doesn't want to switch enclosures, can't get the GE but can the SQ D.
Code reference?Doubt it.
I would think a service disconnect would have to have a way to be externally operable.
Pull out style switches are typically not externally operable, nor are most meter mains.We've been shot down before because of the door on a MLO panelboard with a single large breaker in in attempts to reduce the cost of a larger 3r ECB fo this very reason of it not being externally operable.
Right or wrong it just stuck with me.
May not be the case by actual the rule of the NEC.
Never had a reason to question it.