You are pulling DC homeruns in rooftop conduit for a 10-kW home where the attic reaches high heat, the conduit sits in full sun on the roof, and one raceway transitions through a damp crawlspace. The plan calls for 90C-rated insulation with wet-location and sunlight resistance. Which conductor choice meets temperature, ampacity, UV, and moisture needs?

The sunlight-resistant, wet-rated 90°C conductor sized for hot-roof ampacity correction meets the stated insulation, moisture, UV, and temperature needs. Sun-rated, wet-rated 75°C THWN conductors with heat correction address the environmental exposure and rooftop heat, but their 75°C insulation rating does not meet the specified 90°C requirement. Sun-rated, wet-rated 90°C THWN-2 conductors have the required insulation and environmental ratings, but skipping hot-roof ampacity correction may leave their allowable ampacity too low for the load. Wet-rated 90°C THWN-2 conductors with hot-roof correction address moisture, insulation temperature, and rooftop heat, but without sunlight-resistant marking they do not meet the stated UV-resistance requirement. Exam caveat: a 90°C insulation rating does not automatically permit using the 90°C ampacity as the final allowable value; termination temperature limits and other code rules may govern. Practical check: verify the conductor markings and applicable ampacity tables, then confirm adjusted ampacity, termination ratings, and the suitability of the complete raceway route for its wet and sun-exposed conditions.