A wet well at a municipal pump station is classified as C1, D1. There are 4 submersible pumps with factory installed cables sealed at the pumps. Each cable has been routed through a separate conduit into a j-box. Each conduit is sealed within 18" of leaving the wetwell. The electrician that did this installation has separated the individual conductors at the seal fitting to seal the end of the cable. He stated the AHJ required this.
My question: According to 501.15(D)(3), could the pump cable be considered a single conductor and sealed as such? How do you determine if a cable is capable of transmitting gases of vapors?