# Voltage Drop Calc NEC — NEC Wire Voltage Loss Calc

> NEC Wire Voltage Loss Calc (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448 (this page in markdown: same URL + `.md`)
- Developer: [Rizvan Adzhoian](https://appshunter.io/developer/1891746079)
- Category: Utilities, Business
- Price: $0.99 with in-app purchases
- Age rating: 17+
- Requires: iOS 13.0 · 34 MB
- Languages: American English
- Released: 2026-04-23
- Data updated: 2026-08-01
- User reviews in markdown: https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448/reviews.md

## What is Voltage Drop Calc NEC?

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.

## Pricing and in-app purchases

Base price: $0.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |



## Version history (last 5 releases)

### 1.1.9 — 2026-06-10

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.

### 1.1.8 — 2026-05-18

What's new:
• Moved to tradetools.dev — new umbrella site for all our trade calculators
• Updated support email: support@tradetools.dev
• Refreshed privacy & support pages with unified design
• Bug fixes and stability improvements

Thanks for using ElecTools! Send feedback to support@tradetools.dev.

### 1.1.7 — 2026-04-29

What's new:
• Moved to tradetools.dev — new umbrella site for all our trade calculators
• Updated support email: support@tradetools.dev
• Refreshed privacy & support pages with unified design
• Bug fixes and stability improvements

Thanks for using ElecTools! Send feedback to support@tradetools.dev.

### 1.1.6 — 2026-04-26

Privacy & ad consent update:

- Updated ad consent flow to comply with Google AdMob's latest privacy requirements
- Added "Manage Ad Privacy" option in Settings so users in the EU and UK can review or change their consent at any time
- Improved ad initialization stability and App Tracking Transparency handling
- Minor performance and reliability fixes

### 1.1.5 — 2026-04-25

Cross-promotion improvements: links to other Electools apps now open in App Store on iOS instead of Google Play.

Bug fixes and stability improvements.

## More apps by Rizvan Adzhoian

- [Conduit Fill Calculator-NEC](https://appshunter.io/ios/app/conduit-fill-calculator-nec/id6761846849)
- [Electrical Load Calc NEC](https://appshunter.io/ios/app/electrical-load-calc-nec/id6763250945)
- [Transformer Calc NEC](https://appshunter.io/ios/app/transformer-calc-nec/id6763311943)
- [Grounding Size Calc NEC](https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724)
- [Breaker Size Calc NEC](https://appshunter.io/ios/app/breaker-size-calc-nec/id6763312865)

All apps by Rizvan Adzhoian: https://appshunter.io/developer/1891746079

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-01.*