Voltage Drop Calc NEC

NEC Wire Voltage Loss Calc

$0.99 · In‑App Purchases · Designed for iPad. Not verified for macOS.

Voltage Drop Calc NEC - professional NEC calculator for electricians. Offline, permit-ready. NEC voltage drop calculator for electricians, apprentices, and electrical engineers. Calculate voltage drop instantly using official NEC 2023 Chapter 9 data (Tables 8 and 9). Supports single-phase and three-phase circuits with copper or aluminum conductors. No internet required - works 100% offline on the job site. FEATURES: - Single-phase and three-phase 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% threshold - Shows voltage at load end NEC REFERENCES: - NEC 210.19(A) Info Note 4 - Branch circuit: max 3% - NEC 215.2(A) Info Note 2 - Feeder: max 3% - Combined feeder + branch: max 5% - 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 - Save calculation history - Export calculations as PDF reports - Dark theme support BUILT FOR THE JOB SITE: This app 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 DATA: All resistance and reactance values are sourced from NEC 2023 Edition, Chapter 9. Effective impedance is calculated using Z = R·cos(θ) + XL·sin(θ) per the NEC method. Always verify calculations against the official NEC code book before installation. PERFECT FOR: - Licensed electricians - Electrical apprentices - Electrical engineers and designers - Electrical contractors - DIY electrical projects - NEC code exam preparation OFFLINE & PRIVACY: - Works 100% offline - no internet needed - No account required - No data collection - Your calculations stay on your device Simplify your voltage drop calculations on the job site.

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What's new: • All impedance data verified cell-by-cell against printed NEC Chapter 9 Table 9 • Separate reactance (XL) for steel conduit — previously shared with PVC/aluminum • AC resistance now per conduit type (PVC, aluminum, steel) for all 21 wire sizes • More accurate voltage drop on large feeders (250–1000 kcmil) Thanks for using ElecTools! Send feedback to support@tradetools.dev.

Version 1.1.9

The developer, Rizvan Adzhoian, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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Information

Seller
  • Rizvan Adzhoian
Size
  • 35.6 MB
Category
  • Utilities
Compatibility
Requires iOS 13.0 or later.
  • iPhone
    Requires iOS 13.0 or later.
  • iPad
    Requires iPadOS 13.0 or later.
  • iPod touch
    Requires iOS 13.0 or later.
  • Mac
    Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
18+
In-App Purchases
Yes
Copyright
  • © 2026 Rizvan Adzhoian
  • Developer Website
  • Privacy Policy

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