In a straight pull, what is the minimum length of the box compared to the trade size of the largest raceway?

In a straight pull, the minimum length of the box must be at least eight times the trade size of the largest raceway. This requirement is essential for ensuring that there is enough space within the box to accommodate the bend radius of the conductors and to minimize stress on the wires. The eight times factor allows for proper wire management and helps prevent potential damage to the insulation of the conductors, which could occur if they are forced into a space that is too tight or improperly configured.

This standard is rooted in the principles of electrical safety and code compliance, ensuring that all installations allow for appropriate handling of conductors and maintain functionality over time. By adhering to this guideline, electricians help avoid issues that can arise from overcrowding in junction boxes or conduits, such as overheating and electrical failures.