How much larger must a pull or junction box be when making a U-Pull?

When making a U-Pull in a pull or junction box, using the correct size of the box is essential to ensure that there is enough space for the conductors to be safely managed without causing damage or excessive strain. The requirement for the box to be six times larger than the raceway is based on the need to accommodate the bending radius of the cables and to allow sufficient room for pulling and maintaining conductors.

The general rule outlines that when a U-Pull is made, the pull box must be sized adequately to allow the conductors to enter and exit without sharply bending. This increases the box size to six times the raceway's cross-sectional area, which ensures that there is no excessive pressure on the wires that could lead to insulation damage or failure.

Understanding these requirements is crucial for maintaining electrical safety and system integrity, ensuring that all installations comply with electrical codes and industry best practices.