What is the minimum size for covers of large junction or pull boxes that should be hinged or sectionalized?

For large junction or pull boxes, the National Electrical Code (NEC) specifies that covers must be hinged or sectionalized when the minimum size reaches 6 square feet or more. This requirement is established to ensure easy access for maintenance and modifications, while also providing safety considerations for a cover that is large enough to warrant secure handling and management. The size of 6 square feet strikes a balance between user accessibility and structural integrity, allowing electricians to safely open and close the box without compromising safety or functionality.

In contrast, sizes below 6 square feet do not have the same accessibility needs, allowing for simpler covers that can be removed entirely without the same risk factors as larger boxes. The other options for size, such as 4, 8, and 10 square feet, do not align with this specific minimum requirement outlined in the NEC provisions, which emphasizes the significance of maintaining proper access guidelines for larger electrical infrastructure components.