Hello:

For outside usage, are Solvent Welded PVC
conduit fittings Code compliant ?

(PVC and fittings would be against an outside wall)

Or, must one use the liquid-tite comprssion
type

B.

Solvent Welded PVC conduit fittings are your only choice for use with PVC.

I have never seen liquid-tite comprssion fittings listed for use with RNC.