Final answer:
PVC installed outdoors must be rated for Sunlight Resistance or Sunlight Exposure to ensure it can withstand UV radiation from sunlight. Building or electrical codes typically specify this requirement.
Step-by-step explanation:
PVC (Polyvinyl Chloride) installed outdoors above the ground and exposed to sunlight must be rated for Sunlight Resistance or Sunlight Exposure. If the PVC is not specifically formulated for sunlight resistance, it will degrade under UV radiation, which is a component of sunlight. This information regarding the requirement for PVC to be sunlight resistant can typically be found in the applicable electrical or building codes that govern the installation of PVC outdoor conduits or piping. The codes ensure that the PVC used can withstand the environmental conditions it will be exposed to, including prolonged periods of sunlight.