Schedule 80 PVC conduit can be used in areas subject to physical damage.

This is the wording from the UL White Book.

UL MARK
The Listing Mark of Underwriters Laboratories Inc.

Schedule 80 conduit has a reduced cross-sectional area available for wiring space and is suitable for use wherever Schedule 40 conduit may be used. The marking ‘‘Schedule 80 PVC’’ identifies conduit suitable for use where exposed to physical damage and for installation on poles in accordance with the NEC.

Roger