In calculating width, the minimum dimension for a pull box containing a 5" conduit is what measurement?

The minimum width for a pull box containing a 5-inch conduit is determined by the National Electrical Code (NEC) guidelines. According to these guidelines, when calculating the size of a pull box, the general rule is that the width should be at least 6 times the nominal size of the conduit in inches. Therefore, for a 5-inch conduit, the minimum width required would be 5 inches multiplied by 6, which equals 30 inches. However, when considering the various factors, including allowances for bending radius and working space, the practical minimum dimension for pull boxes often rounds up to 40 inches.

This understanding aligns with the need for ease of access and maintenance of the electrical system. A width of 40 inches allows enough space to effectively pull and manage conductors without excessive strain or risk of damage. Thus, opting for this measurement ensures compliance with safety practices and industry standards, making it the correct answer in this scenario.