Conduit Fill Calculator

Fill Percentage Limits:

Why These Limits?

• • Prevent overheating from poor heat dissipation
• • Allow for wire pulling and future maintenance
• • Reduce mechanical damage during installation
• • Ensure proper derating calculations

Wire Pulling Guidelines

• • Use proper pulling lubricant
• • Avoid excessive pulling tension
• • Install conduit before pulling wires
• • Use proper bend radius for conduit

Derating Considerations

• • More than 3 current-carrying conductors
• • Ambient temperature above 30°C (86°F)
• • Continuous loads (3+ hours)
• • Conduit in direct sunlight

Common Violations

• • Overfilling conduits to save cost
• • Ignoring neutral and ground wires
• • Using wrong wire area calculations
• • Mixing different wire types