Well, safety implications are noted. However, the problem is the possible code loop where there are two solutions to a problem, and both may violate 110.3(B) for not being listed for the purpose.

3/8" NMC Connectors are not listed for a single, bare, solid, #4 AWG conductor.

If the connector Joe shows is indeed a BX connector, it would not be listed for my application, as I cannot aquire amoured #4 or #6 bare or insulated green conductors at my supplier.

The 1/4" hole in the enclosures (with the exception of Sq D) are apparently not listed for anything.

I guess I could use sched 80 PVC all the way down to 6" below grade, but that would end an interesting discussion!

[Linked Image]

-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI