If conductors are installed in conduit located outside of a building or underground in a trench, you need to use 90° C, wet rated conductors.

Name: If conductors are installed in conduit located outside of a building or underground in a trench, you need to use 90° C, wet rated conductors.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Conductors installed outside or underground are more susceptible to moisture and heat, so 90°C wet rated conductors are required for safety reasons.

If Conductors Are Installed in Conduit Located Outside of a Building