Audit voltage-drop arithmetic for one source-selected candidate conductor using documented impedance, path and units—without selecting AWG, ampacity, an allowable drop or code compliance.
A quick decision brief for this specific tool
One de-identified circuit calculation, an already selected candidate-conductor record, its named effective impedance source, paired length/impedance units, current, one-way length, path multiplier and source voltage
Source-preserving candidate voltage drop, percentage and load-side voltage arithmetic for that entered model only
Evaluate current × one-way length × documented path multiplier × candidate impedance per 1,000 units ÷ 1,000; do not select AWG, ampacity, an allowable drop, conductor, breaker or code verdict
Choose your path
Audit voltage-drop arithmetic for one source-selected candidate conductor without presenting the result as ampacity, an allowable drop, a recommended wire size or code compliance.
Reproduce a calculation without a generic ampacity table silently choosing copper AWG.
Name the candidate and impedance sources, copy the circuit model and inspect voltage/drop arithmetic.
Can trace the candidate while final conductor selection remains in the complete design.
See whether length, path multiplier, impedance conditions and voltage came from the submitted calculation.
Inspect source cards, paired units and each entered value rather than a bare AWG recommendation.
No ampacity, 3% pass/fail, breaker or approval is inferred.
Learn why a 2× path or another documented phase multiplier cannot be guessed from three generic inputs.
Run separate foot and metre education records with explicit candidate data and compare steps.
Can explain the arithmetic and list the safety/design checks it omits.
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
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Material, construction, insulation, temperature and installation conditions affect usable data. This tool does not derive a candidate from current.
Candidate identity and impedance come from named sourcesThe path multiplier represents the documented circuit/phase model. Two-wire, DC, single-phase and three-phase calculations cannot be collapsed into one hidden constant.
Drop = I × one-way length × entered path multiplier × impedance/1,000The result receives no 3% pass/fail label. Ampacity, correction factors, protection, combined feeder/branch drop and local approval require the complete adopted design method.
Drop % = voltage drop ÷ entered source voltage × 100Updated: August 2026
A named 8 AWG copper exercise candidate with 0.764 Ω/1,000 ft, 30 A, 50 ft and a documented 2× path gives 2.292 V drop. The tool does not recommend 8 AWG.
Select metres with Ω/km and copy the worksheet's path multiplier. Do not reuse an Ω/1,000 ft number without a validated conversion.
The tool preserves any finite load-side arithmetic and drop percentage without calling it compliant or selecting the next size. Return to the responsible design for candidate changes.
Check one candidate-conductor calculation without letting a generic form choose the wire. Name the candidate and impedance sources, copy the paired units, current, route length, path multiplier and voltage, then audit only that model's voltage-drop arithmetic.