The tool helps you calculate the ideal pull box size for your electrical wiring needs.

## Pull Box Sizing Calculator

This calculator determines the minimum size of a pull box based on the number and size of conduits entering and exiting the box, as well as the type of pull (straight or angle). According to the NEC (National Electrical Code), different rules apply for straight and angle pulls.

### How to Use the Calculator

- Enter the number of conduits.
- Specify the size of each conduit in inches.
- Select whether the pull is a straight pull or an angle pull.
- Click the “Calculate” button to obtain the minimum size of the pull box.

### How the Calculator Works

The calculator employs the following rules based on the NEC standards:

- For
**Straight Pulls**: The size of the pull box should be at least 8 times the diameter of the largest conduit. - For
**Angle Pulls**: The size of the pull box should be at least 6 times the diameter of the largest conduit plus the sum of all the conduit diameters.

### Limitations

Please note that this calculator provides estimates based on standard NEC rules. Always consult a qualified electrician or engineer to ensure compliance with local codes and practices.

## Use Cases for This Calculator

### Calculate the Minimum Pull Box Size

Enter the number of cables to calculate the minimum size of the pull box required for your project. The calculator will compute the size based on the number of cables to ensure a proper fit.

### Determine the Minimum Depth of a Pull Box

By specifying the length, width, and number of cables, you can determine the minimum depth required for a pull box for your specific application. This ensures that the cables can be neatly arranged within the box.

### Find the Maximum Allowable Conduit Fill Percentage

Input the size of the conduit and the number of cables to find out the maximum percentage of conduit fill allowed. This feature helps you comply with regulations and prevent overloading the conduit.

### Calculate the Total Volume of Cables

Specify the dimensions of the pull box and the number of cables to calculate the total volume occupied by the cables. This information is crucial for selecting a pull box that can accommodate all the cables without congestion.

### Determine the Recommended Pull Box Size

After entering the dimensions of your cables and the desired fill percentage, the calculator will suggest the recommended size for your pull box. This ensures that you choose the right box for your specific needs.

### Estimate the Weight of Cables in the Pull Box

By providing the dimensions of the cables and their quantity, you can estimate the overall weight of the cables contained in the pull box. This information is vital for ensuring proper support and installation.

### Calculate Available Space for Additional Cables

Input the dimensions of the pull box, the number of current cables, and the desired fill percentage to calculate the remaining space available for additional cables. This helps in planning for future expansions or modifications.

### Determine the Number of Cables Based on Pull Box Size

Specify the dimensions of the pull box to determine the maximum number of cables that can fit based on the recommended fill percentage. This feature assists in selecting the appropriate pull box size for a given number of cables.

### Compare Different Pull Box Sizes

Enter the dimensions of multiple pull boxes to compare their sizes and capacities. This allows you to visually assess which pull box size best suits your project requirements, ensuring an informed decision.

### Calculate Cable Bending Radius

By specifying the cable diameter and material, you can calculate the minimum bending radius to prevent cable damage. This feature ensures that the cables are installed safely within the pull box.