NEN-Hub
Learning platform for electricians: NEN 1010 / NEN 3140 guides, exam simulator, multilingual technical dictionary.
The task
The Dutch electrical standards are written for specialists, and newcomers, including technicians who do not yet read Dutch well, find them hard to approach. NEN-Hub explains NEN 1010 and NEN 3140 in plain language and lets learners practise with exam-style questions.
What I built
Practical guides on NEN 1010 and NEN 3140, a bank of 503 practice questions with instant feedback, and a technical dictionary of 152 terms in 5 languages: Dutch, English, Russian, Ukrainian and Polish. Dutch is the master language; the other languages follow it. Readers can suggest a correction on every guide.
How it works
A Next.js front end with next-intl handles routing and translations. A FastAPI back end with PostgreSQL handles accounts, search and practice results; search uses vector embeddings (pgvector). Guides are Markdown files in a Git repository, and questions are stored as JSON. Everything runs on my own FreeBSD server behind Apache.
Screenshots
Home page with guides, practice tests and dictionary 
Guide on NEN 3140 for the VP role 
Practice test 
Technical dictionary
Status and limits
Live since 2026. 77 guides carry the label “under review”: they have been checked automatically for references to the standards, but not yet by a qualified person.
NEN-Hub does not replace the official standards. The site itself says:
Independent platform, not affiliated with NEN. Practice results are not a NEN 3140 certificate or an aanwijzing.