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Conduit Fill Calculator
Estimate conduit fill for electrical conductors and compare fill percentage against common NEC planning limits.
Professional workflow
Quickly check whether a conductor bundle fits within a practical conduit fill range.
线管填充计算器
计算线管填充率，确保符合电气规范
根
💡 NEC规范: 1根线53%, 2根线31%, ≥3根线40%
💡 过度填充会导致散热不良和拉线困难
Frequently asked questions
What is conduit fill?
Conduit fill is the percentage of a conduit cross-section occupied by conductors.
Why is conduit fill limited?
Overfilled conduit is difficult to pull, can damage insulation, and may violate electrical code.
Does conductor insulation type matter?
Yes. Outside diameter depends on conductor and insulation type.
Is this a final code check?
No. It is a fast planning tool; always confirm against official code tables.