What defines a weatherproof box according to Article 314?

A weatherproof box, as defined by Article 314 of the National Electrical Code (NEC), is specifically designed to prevent moisture from entering and impacting the safety and reliability of electrical connections. This design feature is crucial because moisture can lead to corrosion and electrical faults, which pose risks such as short circuits or electric shock.

The capacity to keep moisture out is paramount for any electrical device or connection that might be exposed to outdoor conditions or environments where water exposure is a concern. This includes ensuring that gaskets, seals, and other barriers are effectively utilized in the construction of the box to ensure its weatherproof integrity. In summary, the core function of a weatherproof box is to ensure safe and reliable electrical connections by preventing moisture intrusion, making this definition key in the context of electrical installations.