About electrician.wiki

What we are building

Electricians and engineers have relied on phone apps for calculations, pinouts and simulation for over a decade. Those apps are islands: results can’t be linked or printed with their working, paid features fail when a licence check can’t reach the internet, and nothing connects a calculation to the theory or the code section behind it. electrician.wiki puts all of it on the open web, free, with no account, and works offline once your phone has loaded it.

We cover the US National Electrical Code (NFPA 70, editions 2017 to 2026) and the international and British standards (IEC 60364 and BS 7671) side by side, plus the electronics that every electrician and engineer meets: resistor and capacitor codes, LEDs, timers, connectors and a full circuit simulator.

Who writes and checks it

Pages are written and maintained by the electrician.wiki editors. We do not ask you to trust a name. Instead, every calculator shows its full working, cites the code section or standard it relies on, and is backed by published test cases you can check yourself. When we get something wrong, the fix and what it affected are recorded on our corrections page.

Editorial policy

• Every number comes from the engine. Results, worked examples, tables and summaries are all generated by the same calculation engine, so two pages can never disagree. The engine is tested against published worked examples before every release, and a release is blocked if any test fails. See the methodology.
• Editions are explicit. Code-based results name the edition they use (for example “NEC 2023” or “BS 7671:2018+A4:2026”). Where editions differ, we say how. We never quote code text; we cite section numbers and explain in our own words, and we link to the publishers’ free reading options.
• Sources first. Claims cite primary sources: the standards themselves by section, manufacturer data and datasheets, and textbooks. Our sources page lists the editions we use.
• How we use AI. We use AI tools to help draft and organise text. Every number on the site is computed by our tested engine, every technical claim is checked against a cited source, and nothing is published unreviewed.
• Independence. There are no ads, sponsors or affiliate links today. If we add them later they will be clearly labelled, kept away from results, and they will never change a calculation or a recommendation.
• Updates. We review calculators when a new code edition or amendment is published and record substantive changes on each page and in the corrections log.

Our safety position

electrician.wiki is a tool for informed people. Electrical work can kill, and codes are enforced by your local authority having jurisdiction, which may adopt a different edition or amendments. Always verify results against the code in force where you work, follow your inspector, and use qualified people for installation work.

Contact and corrections

Every calculator has a “report a problem” link that sends us the exact inputs you used. You can also reach us through the contact page. We aim to acknowledge reports within 72 hours.