⚡ Conduit Sizing Calculator
⚡ Conduit Sizing Calculator
📊 Conduit Sizing Results
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Minimum Conduit
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Fill Percentage
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Total Area
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Conduit CSA
📝 Calculation Details
📚 NEC Code References
• NEC 300.17: Number of conductors in raceway
• NEC 310.15: Ampacity adjustments
• NEC 334.80: Conductor ampacity
• NEC 352.22: PVC conduit fill
• NEC 358.22: EMT conduit fill
• NEC Annex C: Conduit fill tables
📐 Standard Conduit Sizes
| Trade Size | ID (inches) | Area (in²) | Max Fill 40% | Typical Use |
|---|---|---|---|---|
| 1/2" | 0.622 | 0.304 | 0.122 | Residential circuits |
| 3/4" | 0.824 | 0.533 | 0.213 | Small feeders |
| 1" | 1.049 | 0.864 | 0.346 | Commercial circuits |
| 1¼" | 1.380 | 1.496 | 0.598 | Large feeders |
| 1½" | 1.610 | 2.036 | 0.814 | Service entrance |
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IMPORTANT DISCLAIMER
This tool provides educational estimates only. Electrical work requires: • Compliance with NEC/BS/IEC codes • Local jurisdiction approvals • Licensed electrician installation • Manufacturer specifications • Site-specific conditions assessment