Question: can thhn be used in wet locations?
Answer: THHN wire is allowed for use in dry and damp locations only. ... It's important to note that now many wires in the market are dual rated both THHN and THWN, which means the wire can be used in dry, damp, or wet locations. THHN wire is rated for high heat: it can be found with insulation rating as high as 90°C or 194°F.