I installed a spa sub-panel on the exterior of my house. The inside wiring is NM-B 6AWG wire that goes to a junction box where it's spliced to 6AWG direct bury rated wire (the NM-B wire I had wasn't long enough, so it was cheaper to splice).
The splice was done with split bolts, wrapping 3M Temflex rubber splicing tape, then wrapped in electrical tape.
The inspector claimed that split bolts wrapped in tape are not rated for live connections and I would need to replace the split bolts with standard blue wire nuts.
Is the inspector wrong? To me, the wrench-tightened, rubber insulated splice would be more durable then a $0.50 wire nut.