What is the minimum length and width of a handhole enclosure with a three-inch non-metallic conduit entering and exiting?

In determining the minimum size of a handhole enclosure for non-metallic conduit, it is essential to follow the requirements set by relevant electrical codes and standards. For a three-inch non-metallic conduit, the enclosure must not only accommodate the conduit itself but also provide enough space for maintenance, cable management, and safe entry and exit of the conduit.

The correct answer, which is a minimum of 18 inches in both length and width, ensures that there is sufficient working space for installing, inspecting, and maintaining the conduit. This dimension provides adequate access for technicians, allowing room to maneuver tools and equipment while minimizing the risk of damage to the conduit or other system components.

Moreover, the 18-inch size aligns with industry practices that prioritize safety and accessibility, establishing a standard that helps to reduce clutter and enhance organization within the enclosure.

While larger sizes are also permissible, the minimum requirement of 18 inches emphasizes the balance between adequate space for functionality and efficiency in design. This standard is established to meet the practical needs of electrical work while adhering to safety regulations.