Voltage Drop Verification Checklist PDF

Full QC Checklist+

Verify input accuracy, formula application, pass/fail interpretation, and code compliance.

✓20 Inspection Points

✓4 Verification Categories

✓Input Accuracy+

Wire size (AWG) confirmed from the actual product, not assumed
Load current confirmed from equipment nameplate, not estimated
Run length measured as actual one-way routed distance, not straight-line or round-trip
System voltage and phase confirmed against the actual panel/service
Power factor entered correctly when sizing from a wattage nameplate rating on a motor or reactive load
Load current used reflects steady-state running current, not motor starting/inrush current

✓Formula Application+

Single-phase vs. three-phase multiplier confirmed correct for the actual circuit
Solve For direction matches the actual question being asked
Conductor material (copper vs. aluminum) matches what's actually installed or being specified
Linear relationship between length and drop understood before extrapolating to a different run
Same voltage-drop formula and K-constants confirmed consistent with the Wire Size Calculator, if both are used on the same circuit

✓Result Interpretation+

Maximum voltage drop percentage matched to the load's actual sensitivity
Ampacity, derating, and breaker sizing checked separately with the Wire Size Calculator, not assumed from this tool's sanity note
Comparison table reviewed before committing to a wire size, not just the single selected result
Understood that this is a static, steady-state calculation — motor-starting voltage flicker/sag is a separate phenomenon it doesn't model
Receiving-end voltage checked against the actual equipment's operating voltage tolerance, not just the drop percentage

✓Code Compliance+

Local code edition and any local amendments confirmed before finalizing
Work beyond a simple length/drop check reviewed or performed by a licensed electrician
When checking a feeder plus branch circuit together, the 5% combined limit is applied to the whole path, not to each segment separately
Permit and inspection requirements confirmed for the scope of work

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.