Conduit Fill Calculator
Calculate conduit fill percentage per NEC Chapter 9. Supports EMT, IMC, and RMC conduit types.
Results
Fill Percentage
4.6%
Max Conductors
21
Status
✓ COMPLIANT
NEC Conduit Fill Requirements
| Number of Conductors | Maximum Fill |
|---|---|
| 1 conductor | 53% |
| 2 conductors | 31% |
| 3 or more conductors | 40% |
Understanding Conduit Fill Calculations
NEC Chapter 9, Table 1 specifies the maximum percentage of conduit cross-sectional area that can be occupied by conductors. This ensures adequate space for heat dissipation and ease of wire pulling.
Why Conduit Fill Matters
- Prevents overheating of conductors
- Allows for easier wire installation and pulling
- Ensures compliance with electrical codes
- Maintains conductor insulation integrity
Related Tools
For box fill calculations, use our box fill calculator. Check the wire gauge chart for conductor volume allowances.