NEC voltage drop calculator. Copper & aluminum, feeder sizing. 3% check.
About Voltage Drop NEC Tables 8&9
Voltage Drop NEC Tables 8&9 is a tools app developed by ZkDev.
Download Statistics
Voltage Drop NEC Tables 8&9 has been downloaded 680 times. In the last 30 days, the app was downloaded 280 times.
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App Information
Voltage Drop NEC Tables 8&9 is FREE to download. The APK download size is 20.64 MB. The latest version available is 1.1.9. The last update was on July 23, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play March 2026.
Description
NEC voltage drop calculator for electricians, apprentices, and electrical engineers. Calculate voltage drop instantly using official NEC Chapter 9 data Tables 8 and 9. This electrical feeder sizing calculator supports single-phase and three-phase circuits with copper or aluminum conductors. Works 100% offline on the job site.
Whether you're running a long feeder to a sub-panel or checking branch circuit voltage drop for a commercial project, this voltage drop calculator gives you accurate NEC-compliant results in seconds. Enter your wire length and circuit distance to check voltage loss - use it as your feeder sizing tool for any run length from short circuits to long-distance feeders.
VOLTAGE DROP CALCULATOR FEATURES: • Single-phase and three-phase voltage drop calculations • 5 voltage presets: 120V, 208V, 240V, 277V, 480V • Copper and aluminum conductors: 14 AWG through 1000 kcmil • 3 conduit types: PVC, Aluminum, Steel — separate AC resistance and reactance per conduit • NEC Chapter 9 Table 9 effective impedance (Z) at power factor • Custom power factor support (default 0.85) • Voltage drop in volts and percentage • PASS/FAIL indicator based on NEC 3% recommendation • Recommends minimum wire size to meet 3% voltage drop threshold • Shows voltage at load end
NEC VOLTAGE DROP REFERENCES: • NEC 210.19(A) Info Note 4 - Branch circuit: max 3% voltage drop • NEC 215.2(A) Info Note 2 - Feeder: max 3% voltage drop • Combined feeder + branch: max 5% voltage drop • Chapter 9 Table 8 - DC resistance at 75°C • Chapter 9 Table 9 - AC resistance, reactance, effective Z
PRO FEATURES (one-time purchase): • No ads - clean interface for professionals • Save voltage drop calculation history • Export calculations as PDF reports for permits and records • Dark theme support
BUILT FOR ELECTRICIANS ON THE JOB SITE: This voltage drop calculator is designed by electricians, for electricians. Enter your circuit parameters, see voltage drop instantly, and get a recommended wire size - no complicated menus or unnecessary features.
ACCURATE NEC VOLTAGE DROP DATA: All resistance and reactance values are sourced from NEC Chapter 9. Effective impedance is calculated using Z = R·cos(θ) + XL·sin(θ) per the NEC method. Always verify voltage drop calculations against the official NEC code book before installation.
PERFECT FOR: • Licensed electricians checking voltage drop daily • Electrical apprentices studying for journeyman exams • Electrical engineers and designers • Electrical contractors bidding commercial and residential jobs • Long feeder runs and sub-panel installations • NEC code exam preparation
OFFLINE & PRIVACY: • Works 100% offline - no internet needed on the job site • No account required • No data collection - your voltage drop calculations stay on your device
Simplify your voltage drop calculations on the job site.
Recent changes: • Cross-promotion: discover our other NEC calculator apps • In-app review for easier rating • Firebase Analytics for better app experience • Dynamic version display in settings • Bug fixes and performance improvements
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