A device or tool that aids in determining the necessary dimensions of an enclosure used to facilitate the pulling of electrical conductors through conduits. These enclosures, often referred to as pull boxes, junction boxes, or manholes, require appropriate sizing to accommodate the bending radii of the conductors and provide sufficient working space. The calculation itself involves considering factors such as the conduit size, the number of conductors, and the angle of the pull. For example, in a straight pull, the box length must be at least eight times the trade diameter of the largest raceway.
Accurate dimensioning is vital for code compliance, efficient installations, and long-term system reliability. Undersized enclosures can lead to insulation damage, increased pulling force, and potential safety hazards during installation and maintenance. Historically, these calculations were performed manually using tables and formulas found in electrical codes. The tool simplifies and automates this process, reducing the risk of errors and saving time.
