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CONDUIT SELECTION
CABLES
FILL ANALYSIS
Fill Percentage
14.8%
Maximum allowed: 40%
Total Cable Area
31.50 in²
Conduit Area
213.00 in²
Compliant
✓ Conduit fill 14.8% is within 40% limit
Calculation Steps
- 01Conduit: 3/4" EMT
- 02Internal area: 213 mm²
- 03AWG #14 (3× THHN): 10.5 mm² × 3 = 31.5 mm²
- 04Total cable area: 31.5 mm²
- 05Fill percentage: 31.5 / 213 × 100 = 14.8%
- 06Maximum allowed fill (3+ cables): 40%
- 07✓ Conduit fill 14.8% is within 40% limit
FormulaFill % = (Total Cable Area / Conduit Area) × 100
REFERENCE — NEC REQUIREMENTS
NEC 352.22 (Conduit Fill)
- • 1 wire: 53% max fill
- • 2 wires: 31% max fill
- • 3+ wires: 40% max fill
Installation Notes
- • Use proper pulling lubricant
- • Avoid sharp bends (>90°)
- • Support per NEC 352.30