How to Use the Wire Ampacity Calculator
This wire ampacity calculator helps you determine the safe current carrying capacity of electrical wires based on their size, conductor material, and insulation type.
Calculation Steps
- Select the Wire Size (AWG) from the dropdown menu
- Choose the Conductor Material (Copper or Aluminum)
- Select the Insulation Type (PVC, THHN, or XHHW)
- Click the "Calculate" button
- The calculator will determine the wire ampacity based on standard tables
Factors Affecting Wire Ampacity
- Wire Size: Larger wire sizes have higher ampacity
- Conductor Material: Copper generally has higher ampacity than aluminum
- Insulation Type: Different insulations have different temperature ratings, affecting ampacity
- Ambient Temperature: Higher temperatures reduce ampacity (not factored in this basic calculator)
- Number of Current-Carrying Conductors: More conductors in a conduit reduce individual ampacities (not factored in this basic calculator)
Example Calculation
Let's walk through an example calculation using our Wire Ampacity Calculator:
Scenario:
- Wire Size: 10 AWG
- Conductor Material: Copper
- Insulation Type: THHN
Result: The wire ampacity for this configuration is 35 amperes.
Note: Always consult local electrical codes and consider specific application conditions when determining wire ampacity for actual installations.