Conduit Fill Verification Checklist PDF

Full QC Checklist+

Verify conductor input accuracy, fill percentage/NEC table application, conduit type/sizing, and installation/code compliance.

✓21 Inspection Points

✓4 Verification Categories

✓Conductor Input Accuracy+

Actual conductor count and AWG sizes match the real circuit design, not guessed or approximated
Insulation type confirmed as THHN/THWN-2 or an equivalent-area type, since this calculator assumes that specific insulation
Equipment grounding and bonding conductors included in the conductor count, not forgotten
Control, signal, or communication conductors sharing the same conduit included in the count
Future spare conductors for planned expansion considered before finalizing conduit size

✓Fill Percentage & NEC Table Application+

Correct NEC Table 1 fill percentage tier applied based on total conductor count (53% for 1, 31% for 2, 40% for 3+), not assumed as always 40%
Conductors from different circuits confirmed genuinely allowed to share this one conduit
Ampacity derating for more than 3 current-carrying conductors checked separately — this is a different calculation from fill percentage
Understood that grounding conductors count toward fill percentage but are excluded from the current-carrying-conductor count for ampacity derating
Jam ratio checked separately if exactly 3 similarly-sized large conductors are being pulled

✓Conduit Type & Sizing+

Conduit type selection matches what's actually being installed — EMT, PVC, and RMC have different internal areas
Recommended trade size confirmed as a real, available manufactured size for your specific conduit type and supplier
Future conductor additions considered before finalizing conduit size, not sized to the bare minimum for today's conductors
Conduit fill result cross-checked against the actual wire size determined by the Wire Size Calculator
Understood that short nipple runs (24 inches or less between boxes) follow different, more permissive fill rules not modeled by this calculator

✓Installation & Code Compliance+

Local code edition and amendments checked for any conduit fill differences from the NEC baseline used here
Conduit support spacing and securing requirements checked separately from fill sizing
Total bend limits (typically 360° maximum between pull points) checked separately from fill percentage
Conduit fill checked and confirmed before wire is pulled, not discovered as a problem afterward
Licensed electrician review obtained for a permanent installation
Conduit fitting fill limits (LBs, condulets, junction boxes) checked separately, since some have more restrictive limits than straight conduit runs

Inspection Notes+

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Inspection Notes

Use the latest approved drawings, specifications, and site measurements.

Complete all critical checks before proceeding to the next work stage.

Record deviations and confirm rectification where required.

Use it after collecting the project inputs and again before approving or closing the relevant work stage.

No. It supports verification but does not replace approved drawings, specifications, codes, manufacturer requirements, or professional inspection.