# Grounding Size Calc NEC — NEC Art.250 EGC & GEC

> NEC Art.250 EGC & GEC (iPhone/iPad app by Rizvan Adzhoian.)

- Source: https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724 (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: English
- Released: 2026-04-24
- Data updated: 2026-06-26
- User reviews in markdown: https://appshunter.io/ios/app/grounding-size-calc-nec/id6763312724/reviews.md

## What is Grounding Size Calc NEC?

NEC grounding size calculator for electricians, apprentices, and electrical engineers. Three calculators in one app: Equipment Grounding Conductor (EGC) from Table 250.122, Grounding Electrode Conductor (GEC) from Table 250.66 with sole-connection exceptions, and Bonding Jumper from Table 250.102(C)(1) with the 12.5% rule. Works 100% offline on the job site.

Whether you're sizing an EGC for a 200A circuit, determining the GEC for a 500 kcmil service with a ground rod electrode, or calculating a bonding jumper for parallel service conductors, this calculator gives you accurate NEC-compliant results in seconds.

THREE CALCULATORS IN ONE:

EQUIPMENT GROUNDING CONDUCTOR (EGC):
- Size EGC per NEC Table 250.122 - all 21 table rows from 15A to 6000A
- All 37 standard OCPD ratings per NEC 240.6(A) selectable - including 30A, 40A, 50A, 70A, 125A
- Copper and aluminum conductor support
- Voltage drop adjustment per NEC 250.122(B) - proportionally increase EGC when circuit conductors are upsized
- Original and adjusted wire size selection for accurate proportional calculation
- Automatic rounding up to next standard OCPD rating

GROUNDING ELECTRODE CONDUCTOR (GEC):
- Size GEC per NEC Table 250.66 based on service conductor size
- Support for copper and aluminum service conductors
- Parallel sets calculation (1-6 sets) with automatic equivalent area computation
- Sole-connection exceptions per NEC 250.66(A), (B), and (C):
  - 250.66(A): Rod, pipe, or plate electrode - GEC capped at #6 Cu / #4 Al
  - 250.66(B): Concrete-encased electrode - GEC capped at #4 Cu / #4 Al
  - 250.66(C): Ground ring - GEC capped at #2 Cu / #2 Al
- Five electrode types: Water Pipe, Rod/Pipe/Plate, Concrete-Encased, Ground Ring, Other

BONDING JUMPER:
- Size bonding jumpers per NEC Table 250.102(C)(1)
- Same ranges as Table 250.66 for conductors within table limits
- Automatic 12.5% rule for service conductors exceeding 1100 kcmil Cu or 1750 kcmil Al
- Parallel sets support with combined circular mil area calculation

CALCULATION RESULTS INCLUDE:
- Conductor size in AWG or kcmil with alternative material
- Exception applied with NEC section reference
- NEC article references for every result
- Detailed notes for parallel sets and electrode exceptions

NEC REFERENCES INCLUDED:
- NEC Table 250.122 - Equipment grounding conductor sizing
- NEC 250.122(B) - EGC increase for voltage drop
- NEC Table 250.66 - Grounding electrode conductor sizing
- NEC 250.66(A) - Rod, pipe, or plate electrode exception
- NEC 250.66(B) - Concrete-encased electrode exception
- NEC 250.66(C) - Ground ring exception
- NEC Table 250.102(C)(1) - Bonding jumper sizing
- NEC 250.102(C)(1) - 12.5% rule for large conductors

PRO FEATURES (one-time purchase):
- No ads - clean interface for professionals
- Save grounding calculation history with labels
- Export calculations as PDF reports for permits and records
- Dark theme support

PERFECT FOR:
- Licensed electricians sizing grounding conductors daily
- Electrical apprentices and journeyman exam preparation
- Electrical engineers specifying grounding systems
- Electrical inspectors verifying conductor sizes

OFFLINE & PRIVACY:
- Works 100% offline - no internet needed on the job site
- No account required
- No data collection - your calculations stay on your device

Simplify your grounding and bonding 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)

### 1.0.8 — 2026-06-10

What's new:
• Complete NEC Table 250.122 catalog — added 30A and 40A rows (all 21 rows covered)
• All 37 standard OCPD ratings per NEC 240.6(A) selectable: 25A, 50A, 70A, 90A, 125A, 175A and more
• Copper-only guidance for concrete-encased electrode connections per 250.66(B)

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

### 1.0.7 — 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.

### 1.0.6 — 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.

### 1.0.5 — 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

### 1.0.4 — 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)
- [Voltage Drop Calc NEC](https://appshunter.io/ios/app/voltage-drop-calc-nec/id6763312448)
- [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 2026-06-26.*