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CEC Conduit Fill Calculator

Estimate conduit fill for Canadian electrical installations using conduit type, trade size, wire insulation type, conductor size, and quantity.

Inputs

Add the conductors in the raceway. Conductor insulation matters because fill is based on the outside area of the insulated conductor.

Conductors

Count all insulated conductors that will occupy the conduit.

Results

Status
Pass
Within estimated fill limit.
Conduit Fill
0.00 %
Recommended Minimum Conduit
-
Total Wire Area
0.00 mm²
Conduit Internal Area
0.00 mm²
Fill Limit Used
40 %

Calculation Details

    Shop Conduit & Fittings Shop Wire & Cable Ask Arkco to Verify This Run

    Common Examples

    Conduit Fill Notes

    Insulation Type
    Wire type changes the outside conductor area. A #8 T90 conductor may not occupy the same area as #8 RW90.
    Fill Limits
    This calculator uses common fill limits: 53% for one conductor, 31% for two conductors, and 40% for three or more.
    Recommendation
    The recommended conduit is based on fill only. Pull length, bends, derating, ampacity, and job conditions must still be reviewed.
    Field Estimate
    Actual results can vary with conductor manufacturer, conduit data, code edition, and local authority requirements.
    Disclaimer
    This calculator is provided as a general estimating tool only. Results are based on simplified assumptions and available conduit/conductor area data. It does not replace engineering review, manufacturer data, the Canadian Electrical Code, local amendments, or approval by the authority having jurisdiction. Arkco Electrical Supply is not responsible for design decisions, installation outcomes, or code compliance based on this calculator.

    © 2026 Arkco Electrical Supply. This calculator is provided for Arkco customers and may not be copied or republished without written permission.