What is the minimum calculated width for another pull box described?

The minimum calculated width for a pull box is critical to ensure that electrical conductors can be pulled and maintained without excessive strain or damage. The width should accommodate not just the conductors themselves but also offer enough space for any bends, connections, and tools that may need to be used during installation or maintenance.

A width of 20 inches allows for a suitable working space that meets the National Electrical Code (NEC) requirements for pull boxes. This dimension facilitates easier handling of the wires and prevents overcrowding, which can lead to issues such as overheating or insulation damage. In addition to providing adequate space, a width of 20 inches ensures compliance with safety standards that aim to protect both the electrical system and the workers involved.

The other choices do not meet the minimum requirements as effectively as 20 inches. While wider options provide more space, they may exceed what is necessary for the intended application based on industry standards. Thus, selecting the width of 20 inches strikes a balance between functionality and compliance with existing regulations.