I once had 2-hole PVC straps on a 2" PVC riser for a 200A service. It was in direct sunlight and after 1 year most of the straps snapped off. Fortunately, the one at the top near the weather-head didn't. I went back and replaced them with 2-hole metal straps. I know it's not Code compliant but the CMP's making these rules are not out here in the field installing these services (maybe they did at one time and forgot what it's like). I don't know if they realize that we're not installing T-stat wire inside these conduits.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
For the record, I also use 2" cowboys for a 2" PVC riser. I haven't failed an inspection but that doesn't mean I'm right in doing so.