What characteristics must boxes located in wet areas possess?

Boxes installed in wet areas must be listed for use in wet locations to ensure safety and compliance with the National Electrical Code (NEC). This designation indicates that the boxes are designed to withstand the exposure to moisture and any associated corrosive effects, making them suitable for environments where they may come into contact with water.

Using a box that is specifically listed for wet locations means it has undergone testing to demonstrate its ability to protect the electrical components housed within from water ingress, which can lead to short circuits, corrosion, or even electrical failures. Ensuring that fixtures in wet areas are properly rated helps maintain both functionality and safety.

In contrast, options suggesting that boxes be waterproof without further qualifications do not address the requirements set by the NEC. Similarly, boxes rated only for dry locations would not provide adequate protection in a wet environment. Lastly, insulation is not a typical requirement for wet location boxes as it relates more to thermal protection rather than moisture resistance.