What it does
Each tool follows the rules of the standard you pick, so the numbers on screen match the numbers on your paperwork.
All the tools
Wire sizing
Ampacity with correction factors, per your national standard's tables.
Breaker sizing
Continuous-load rules and standard ratings, with circuit-level checks.
Voltage drop
Per-standard limits for single-phase and three-phase runs.
Power & current
Single- and three-phase current, kVA, and transformer secondary current.
Motor full-load current
NEC 430.250 tables plus overload and short-circuit protection guidance.
Lighting & energy
Lumen and fixture counts, with daily and monthly energy cost estimates.
Wiring colour codes
Conductor colours by country — single-phase, three-phase and DC views.
National standard checks
Dwelling-branch compliance with cited clause numbers for every standard.
Reference
Formulas, code sections and quick-reference cards for every supported standard.
Works offline
No account, no telemetry, no external services. Everything runs on your machine.
Kuwait MEW R-1 check
Dwelling-branch compliance against Kuwait's MEW Regulation R-1, with cited clauses.
Sri Lanka Wiring Regulations
Standard checks per Sri Lanka's wiring regulations (b055).
Romania I7-2011 check
New in b056 — dwelling checks per I7-2011 (2023 amendments): RCD tier incl. lighting, AFDD.
Oman OES-4 check
New in b057 — circuit checks per Oman's OES-4 (2019): 240/415 V supply, 30 mA RCD on socket circuits, BS 1363 practice.
Ghana L.I. 2008 check
New in b058 — dwelling checks per Ghana's Electrical Wiring Regulations 2011: 230/400 V 50 Hz, 30 mA RCD ≤40 ms, ring final 32 A / 2.5 mm² ≤100 m², IEC colours.
Oman 3-phase colours fixed
b058 correction — Oman OES-4 three-phase now shows the IEC set (brown/black/grey) instead of the US-style set.
Nigeria NESIS check
Ring and radial socket rules, black-neutral colour table and ELCB requirements straight from NESIS 2015.
Bahrain EWA Wiring Regulations check
Dwelling checks per Bahrain's EWA Electricity Wiring Regulations (BS 7671:2018 basis): 230/400 V 50 Hz, harmonised colours with 3-phase brown/black/grey, 30 mA RCD on socket circuits, BS 1363/type G sockets.
Brunei PBD IEC 60364 check
New in b061 — dwelling checks per Brunei's PBD IEC 60364: 240/415 V 50 Hz, harmonised colours with 3-phase brown/black/grey, 30 mA RCD on socket-outlet circuits, BS 1363/type G sockets.
Uganda IEE Regulations 2017 check
New in b059 — dwelling checks per Uganda's IEE Regulations 2017: 240/415 V 50 Hz, legacy UK red/black colours in common use with an IEC-stock warning, 30 mA RCD on socket circuits ≤32 A, BS 546/type G sockets.
Three-phase colour codes
Phase, neutral and protective conductor colours per country — current and older schemes side by side for panel and machine work.
Send Feedback
Help > Send Feedback in the app — routes your message to the right reviewer with useful context.
Countries and languages
The app works in your language and applies the wiring rules of your country — one switch in Settings, no reinstall. Countries covered include:
The app uses the terms you know: a circuit breaker is a disjoncteur in France, a Sicherungsautomat in Germany and Austria, an ασφάλειας in Greece, a megszakító in Hungary, an automaat in the Netherlands, an interruttore in Italy, a disjuntor in Brazil and Portugal, a wyłącznik nadprądowy in Poland, an otomatik sigorta in Turkey — and the interface follows suit.
Interface languages include: English · Français · Deutsch · Español · Português · Italiano · Nederlands · Ελληνικά · Magyar · Polski · Türkçe · Română · plus more added with every build — pick yours in Settings, no reinstall.
Supported standards include
NEC (USA) · CE Code (Canada) · SANS 10142 (South Africa) · BS 7671 (UK) · I.S. 10101 (Ireland) · NF C 15-100 (France) · DIN VDE 0100 (Germany) · NEN 1010 (Netherlands) · RGIE/AREI (Belgium) · MSZ HD 60364 (Hungary) · OVE E 8101 (Austria) · ČSN 33 2000 (Czechia) · AS/NZS 3000 · SFS 6000 (Finland) · BEK 1082 (Denmark) · SS 436 40 00 (Sweden) · NEK 400 (Norway) · NIN (Switzerland) · REBT (Spain) · RTIEBT (Portugal) · I7-2011 (Romania) · NESIS 2015 (Nigeria) · OES-4 (Oman) · L.I. 2008 (Ghana) · IEE Regulations 2017 (Uganda) — plus standards across Asia-Pacific, the Middle East and Latin America.
Frequently asked questions
Does the app need an internet connection?
No. Everything runs locally on your Windows machine — calculators, colour-code charts and standard checks included. The only online step is downloading the installer itself.
Which countries and standards are covered?
52 countries across Europe, the Americas, Asia-Pacific, Africa and the Middle East, each with its own national wiring standard — NEC, BS 7671, NF C 15-100, I.S. 10101, AS/NZS 3000 and many more. See the lists above.
Do I need an account or subscription?
No. One download, no sign-up, no recurring fees. Installing a new build replaces the previous one and keeps your settings.
What languages does the interface support?
The app works in your language and uses local trade terminology — pick both in Settings, no reinstall needed.
Windows shows a SmartScreen warning when I run the installer. Is that normal?
Yes, for now. The installer isn't code-signed yet, so Windows shows a reputation warning for first-time downloads. Verify the file's SHA-256 hash on our Security page, then click "More info" and "Run anyway".
Does it collect any of my data?
It doesn't. No telemetry, no analytics, nothing leaves your machine. This website sets no tracking cookies either — the footer's IP line is fetched on demand and never stored.
Security & verifying your download
After downloading, run this in Command Prompt or PowerShell and compare the output with the value below:
certutil -hashfile toptronic_assistant-0.1.61-b061-x86_64.msi SHA256
Build 060 (current): 956aba8074b650ce1d394d7d96c10bf76675172f4e679f2589150af38e8b92ea
Build 060 (previous): 34d152e02694e8fc8c1dcef28659b70877646225b26084c272282a2b548fefb2
Build 058 (previous): 3bdae11949da616d562443ab096e0db00e0be7b63783ddb1442126868109c4e7
Build 057 (previous): 9f275cb0eeeab0c5c6f370fbc96c5041586c4067e17bf6bf664ca8e685d8994b
Build 056 (previous): a661b5f1294ab51d75bbd1ee3ad10ffa6ca1fee4dd8be0629c0567dddb838d1e
About the SmartScreen warning. The installer is not yet code-signed, so Windows may show a blue "Windows protected your PC" dialog on first run. That is a reputation warning for small-vendor software, not a virus detection. Verify the hash above, then click "More info" and "Run anyway". Once a code-signing certificate is in place, the dialog stops appearing. The app itself makes no network connections at runtime — if it ever tries to, that's not our build.
Feedback
Found something that doesn't add up, or wish the app did something it doesn't? Send it straight to the development team — the same channel the app's Help > Send Feedback uses.
About Toptronic
Toptronic® Assistant is built by Toptronic® Ltd, a small software company that works alongside practising electricians rather than at arm's length from them. Every calculator and standard check starts from a real job — a panel to size, a cable run to justify, an installation to sign off — and ships only when it matches the national standard it claims to follow.
The company was founded by Jacques, an electrical engineer who spent years on sites and in switch rooms before writing a line of code. Toptronic® Ltd remains independent and self-funded: no investors, no subscription treadmill — just a toolbox that keeps getting better, one build at a time.
jacques@toptronic.com — write directly; mail is read and answered.