How to Use the Conduit Size Calculator?

1. Select Conduit Type
Choose the type of conduit you’re using from the dropdown menu. Options include EMT (Electrical Metallic Tubing), IMC (Intermediate Metal Conduit), RMC (Rigid Metal Conduit), and PVC (Polyvinyl Chloride). Each type has different properties and is used in various applications.

2. Enter Wire Size
Input the size of the wires you’re using in American Wire Gauge (AWG). The calculator supports sizes from 14 AWG to 500 MCM. If you’re using multiple wire sizes, enter the largest size for a conservative estimate.

3. Specify Wire Count
Enter the total number of wires that will be running through the conduit. This includes all conductors, including ground wires.

4. Set Fill Percentage
The fill percentage is the maximum amount of the conduit’s cross-sectional area that can be occupied by wires. The NEC typically recommends a maximum of 40% for new installations, which is set as the default. You can adjust this if needed, but be aware that exceeding NEC recommendations may violate code requirements.

5. Calculate
Click the “Calculate” button to process your inputs. The calculator will display the following information:

• Recommended Conduit Size: The smallest standard conduit size that meets your requirements.
• Total Wire Area: The combined cross-sectional area of all wires.
• Required Conduit Area: The minimum internal area needed in the conduit to accommodate the wires at the specified fill percentage.
• Fill Percentage: The actual fill percentage based on the recommended conduit size.

This Conduit Size Calculator is an invaluable tool for electricians, engineers, and DIY enthusiasts. It simplifies the process of selecting the correct conduit size, ensuring safety, code compliance, and efficient use of materials.

However, it’s important to remember that while this tool provides a solid recommendation, professional judgment and adherence to local codes are crucial in the final decision-making process for any electrical installation.