Comparison

Fault Current Calculator vs Kopperfield

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Fault Current Calculator

This tool helps contractors, engineers, and electricians quickly calculate available fault current on single and three-phase electrical systems. It also assists in sizing fuses and conductors for various circuits and can generate labels for service equipment.

Highlights
  • Calculate available fault current
  • Size fuses and conductors
  • Generate service equipment labels
  • Single and three-phase system support
  • NEC® 110.24 compliance
Features
Read full description

Eaton's Bussmann Series FC2 Available Fault Current Calculator application is an innovative tool developed for contractors, engineers, electricians, and electrical inspectors. This tool can be used on the Bussmann website or out in the field on a mobile device for those needing a quick and simple way to determine available fault current. With this simple tool, users can: - Calculate available fault current on single and three-phase systems - Create and send a label via email for marking the available fault current on service equipment (NEC® 110.24) - Size fuses and conductors for service, feeder, and branch circuits. This application, calculations, and other information are intended to clearly present technical information that will determine the available fault current at specific points in an electrical system. Bussmann reserves the right, without notice, to change this application and/or discontinue/ limit its distribution and/or availability. Bussmann also reserves the right to change or update, without notice, any technical information contained in this application. The data and information presented in this application are believed to be accurate. However, any and all liability for the content, or any omissions from this application, including any inaccuracies, errors, or misstatements in such data, calculations or information, is expressly disclaimed. The application, calculations and other information are provided without warranty of any kind, either expressed or implied, but not limited to, the implied warranties of merchantability, or fitness for a particular purpose. Bussmann disclaims any liability for the use of this application, calculations or other information. The complete End-User License Agreement can be found at: https://faultcurrentcalculatorpro.bussmann.com/home/eula

About

Kopperfield

Streamline electrical design and permitting with powerful tools for load calculations, panel schedules, and single-line diagrams. Quickly reference the National Electrical Code with an AI-powered chatbot and generate instant PDF reports for inspectors and clients.

Highlights
  • Load calculator with NEC standards
  • Single line diagram tool
  • Panel schedule creation
  • NEC chatbot
  • Instant PDF report generation
  • AI panel photo processing
  • Team dashboard
Features
Read full description

Save time and money. Get ready for permits and projects with faster and easier design tools from Kopperfield, including load calcs, line diagrams, panel schedules, and more. Once logged into your Kopperfield account, you'll enjoy our: * Load calculator: Easy-to-use interface pre-loaded with common appliances and their standard output values from the National Electrical Code. Add information on the property and your calculation will automatically update. Supports both commercial and residential calculations, as well as the Standard (NEC Article 220 Part III), Optional (NEC Article 220 Part IV), and 2026 Standard (NEC Article 120 Part III) methods. * Single line diagram tool: Contains dozens of common templates and electrical symbols to make it easy to generate new diagrams and share them with your team. View diagrams from any device and create new templates on tablet or desktop for your whole team to use. * Panel schedules: Includes tools to complete panel schedules and create labels for electrical panels. Drag-and-drop interface makes it easy to arrange and customize circuits for both split-phase and three-phase projects. * NEC chatbot: Custom chatbot with advanced search capabilities to quickly reference specific sections of the 2017, 2020, or 2023 National Electrical Code. Includes the following features: * Fast PDF outputs: instantly generate a downloadable, one-page PDF report of your load calc, line diagram, or panel schedule to share with inspectors and customers * Smart property data: enter the property address and we’ll pull in the square footage for any customer project or electrical load calculation * AI panel photo processing: upload a photo of an electrical panel to automatically add items to your load calculation or panel schedule * Team dashboard: store your team's projects and documents in one place for easier management, access, and review *Single and three phase options: use a variety of nominal voltages for residential and commercial building types, including: 120/240V, 120/208V, 120/240V, 208Y/120V 3Ø, 240V 3Ø Delta, 240V 3Ø Hi-leg Delta, 347V 3Ø Delta, 480Y/277V 3Ø, 480V 3Ø Delta, 600Y/347Y 3Ø, 600V 3Ø Delta. * Standard scenarios: generate load calcs for scenarios including single family homes (standard and optional methods), multi dwelling units (i.e., duplex, triplex, quad), 120/208v (three-phase power) dwellings, accessory dwelling units and additions, commercial occupancy types, and heat pumps * Common appliance defaults: choose from a pre-loaded list of common appliances and standard output values that you can adjust for every load calculation * EV charger inputs: include EV charger values to any load calculation, essential for modern homes

Screenshots

Fault Current Calculator4 screens
Kopperfield4 screens

Verdict

The call

The clearest difference is rating: Kopperfield at 3.9 against Fault Current Calculator's 3.1. Kopperfield also leads on in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 4 months). On price, review sentiment, ratings volume and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Fault Current Calculator sells 2 in-app purchases, starting at $4.99 per month. Kopperfield asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Kopperfield holds the better App Store score, 3.9 against 3.1. Both are backed by a comparable volume of ratings — 23 and 9 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

UpkeepUpdate frequency

Fault Current Calculator ships an update every 4 months, Kopperfield every 3 weeks. The most recent releases landed on September 14, 2026 and September 16, 2026 respectively.

Scorecard4 real differences · 6 level
Fault Current Calculator versus Kopperfield: the parameters behind the verdict, then further details
ParameterFault Current CalculatorKopperfield
PriceFreeFree
Rating3.1 (23 ratings)3.9 (9 ratings) — better
Positive reviews0.0% of reviews0.0% of reviews
Number of ratings23 — better9
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumAd-supported — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.0 — better15.1
Further details — not scored
Size25 MB45 MB
Age rating17+4+
DeveloperCooper Bussmann, LLCKopperfield

Customer experience

Fault Current Calculator

All ratings23 ratings
Positive47.8%
Neutral8.7%
Negative43.5%
Written reviews10 reviews
Positive0.0%
Neutral20.0%
Negative80.0%

Kopperfield

All ratings9 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

2 purchases

Fault Current Calculator

Subscriptions2
  • Pro Monthly Subscription7 Days trial$4.991 Month
  • Pro Annual Subscription7 Days trial$39.991 Year
None

Kopperfield

No in-app purchases

Questions

Is Fault Current Calculator free?
Fault Current Calculator is free to download, with in-app purchases available.
Is Kopperfield free?
Kopperfield is free to download, with no in-app purchases.
Which has better reviews, Fault Current Calculator or Kopperfield?
Kopperfield is rated higher. Fault Current Calculator averages 3.1 out of 5 from 23 ratings, while Kopperfield averages 3.9 from 9 ratings.
Do Fault Current Calculator or Kopperfield have ads?
Neither Fault Current Calculator nor Kopperfield shows ads.
Which is updated more often, Fault Current Calculator or Kopperfield?
Fault Current Calculator ships an update every 4 months, and Kopperfield every 3 weeks. Most recently, Fault Current Calculator was updated on September 14, 2026 and Kopperfield on September 16, 2026.

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