What cover type is required for accessible hand holes in wet locations?

In wet locations, the National Electrical Code (NEC) specifies that accessible hand holes must be equipped with a metal cover. This requirement is primarily due to the durability and stability that metal provides in environments where moisture is present. Metal covers are better suited to withstand physical impacts, help prevent water infiltration, and provide reliable grounding potential if properly installed. This makes them a safer option in wet locations, as they can resist corrosion and degradation from the elements more effectively than plastic or other materials.

While other cover types may have their advantages in specific applications, they do not offer the same level of protection and durability required for installations in wet areas. For example, plastic covers may be more susceptible to damage and may not seal out moisture as effectively, while cable covers are designed for different applications and do not meet the specific requirements for hand holes. Heavy-duty covers, although robust, are not necessarily mandated for use in wet conditions unless specified by the application. Thus, the metal cover is the most appropriate choice for ensuring both safety and compliance in these environments.