Grounding NEC 250 Calculator is a tools app developed by ZkDev.
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Grounding NEC 250 Calculator has been downloaded 49 times. In the last 30 days, the app was downloaded 10 times.
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App Information
Grounding NEC 250 Calculator is FREE to download. The APK download size is 20.61 MB. The latest version available is 1.0.8. The last update was on June 10, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play April 2026.
Description
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. This electrical grounding calculator 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 grounding calculator gives you accurate NEC-compliant results in seconds - perfect for grounding system design and installation verification.
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
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.
Recent changes: 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)
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