As a follow-up to this question, if I have wet/damp location-rated cables going from an outdoor breaker box, up a ~5' SCH40 PVC conduit, and into a building attic, do I need to secure both ends of the cable to both the breaker box and and interior junction box or just the interior junction boxes?

At one end is the breaker box, but at the other end, the cables exit the large PVC conduit, run outside conduit (in the attic) a short distance, then enter a plastic junction box to be spliced to NM cable used for the interior wiring. The plastic junction boxes have cable clamps for the cable coming from the conduit.

Would this arrangement be admissible under the NEC?

As a follow-up to this question, if I have wet/damp location-rated cables going from an outdoor breaker box, up a ~5' SCH40 PVC conduit, and into a building attic, do I need to secure both ends of the cable to both the breaker box and and interior junction box or just the interior junction boxes?

At one end is the breaker box, but at the other end, the cables exit the large PVC conduit, run outside conduit (in the attic) a short distance, then enter a plastic junction box to be spliced to NM cable used for the interior wiring. The plastic junction boxes have cable clamps for the cable coming from the conduit.

Would this arrangement be admissible under the NEC?