312.5(B)'s verbage has me picturing those old K&T meters , i am not sure of the definitional interpertation of 'conductor' vs. 'cable' in this article...
314.17(D) here is interesting as i stock #4 cu for all 100 & 200A services....
(D) Conductors 4 AWG or Larger. Installation shall comply with 300.4(F).
which brought me to 300.4(F) here;
(F) Insulated Fittings. Where raceways containing ungrounded conductors 4 AWG or larger enter a cabinet, box enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place
despite raceway,cable or conductor is the intent of both is 'ungrounded'....?
