How much larger must a pull or junction box be when making an angle pull?

When creating an angle pull, the size of the pull box or junction box is crucial for ensuring that all conductors can be easily managed without damage. The National Electrical Code (NEC) outlines specific requirements for the dimensions of pull boxes based on the size of the raceways entering and exiting. For angle pulls, it specifically states that the box must have adequate space to accommodate the conductors as they transition around the bend.

The requirement for a pull box to be six times the diameter of the largest raceway entering it derives from the need to prevent damage to the conductors during installation and maintenance. This size allows sufficient room for the bend radius of the cables, which is essential to avoid stress on the wires that could lead to insulation damage or other electrical failures. In practice, this ensures that the conductors can be pulled smoothly and without excessive force, maintaining the integrity of the electrical installation.

Smaller box sizes than six times the largest raceway would not provide enough space, potentially leading to complications during pulls, increased risk of conductor damage, and possible violations of safety codes. Thus, adhering to this guideline is critical for safe and effective electrical installations.