From a verbal brief to a production-ready panel

Slovak electricians are designing STN-compliant panels in spreadsheets.

The work demands STN 33 2000, STN 33 2130, IEC 60364, IEC 81346 reference designators, IEC 60446 wire colours, 23% Slovak VAT, IBAN, company and tax IDs on every quote and invoice. The tools that ship with the trade don’t know any of that. So the panel gets designed in Excel, the quote in Word, the invoice in a separate SaaS, the inspection report on paper. Five places to keep in sync, the same data typed five times.

Schrack and the other manufacturer tools sell their own SKUs. The catalogue is locked, STN logic is implicit, and you can't hand a customer a BOM. Generic ERPs and spreadsheets don't know what an RCD type B is, don't know any FVE circuit triggers SPD T1+T2, and don't carry the 150-SKU Slovak wholesale catalogue. The electrician carries the compliance, in his head. Foreign field-service SaaS translates the menus and gets the 23% Slovak VAT, the §69 reverse-charge, fiscal e-receipts, and STN references on the inspection report either wrong or absent.

Brief to closeout in seven steps. Never leaves the app.

Seven steps from a customer text message to a signed handover protocol and a numbered invoice. Every artefact along the way is real: STN-compliant SLD, IEC 60446-coloured wiring, IEC 81346 designators, IBAN on the invoice.

1. № 01

   Brief

   Slovak natural language, a floor-plan photo (JPG/PNG/PDF), or a voice prompt on Biznis. Misspellings, idioms, diacritics-optional all tolerated.

2. № 02

   AI design

   Claude Sonnet 4.6 returns 18 circuit types across 60+ device types in 15 room types. Main switch sized to load, Q1 25 A / 6 kA Icu, RCD groups, phase assignment.

3. № 03

   Panel review

   Interactive front-panel view. See exactly which modules sit on which DIN rail, with capacity tracking and Q1-vs-branch selectivity guard rails.

4. № 04

   Floor-plan refine

   Floor-plan editor: a complete tool, 27 device types, trunk-and-branch auto-router, drag a PDF in as a trace layer, 8 switch setups, 50+ rooms tested.

5. № 05

   Quote

   Three pricing tiers (Economy 0.82× / Standard 1.0× / Premium 1.22×), shareable proposal link, WhatsApp send, customer signature on canvas.

6. № 06

   Install

   Site sheet with 18-pt FA refs. 3-phase per-circuit status (Pulled → Wired → Tested). Photo capture per circuit. Offline-tolerant.

7. № 07

   Handover

   Handover protocol, inspection report per STN 33 2000, 24-month warranty statement, auto-numbered FA-YYYY-NNN invoice with IBAN and VAT.

Claude Sonnet 4.6, fluent in Slovak field talk.

Claude Sonnet 4.6 as the brain: understands how an electrician actually talks (not how a spec sheet is written), calls exactly 34 whitelisted actions, full design ≈ €0.01. Mid-design chat is practically free thanks to prompt caching. Sonnet 4.6 wins here over the larger Opus 4.8. No measurable quality lift, double the cost.

STN/IEC auto-configuration. Every default is field-tested.

Main switch sized by total load. Q1 default 25 A / 6 kA Icu (the Slovak distributor standard) auto-upgraded to 10 kA HMF/HMC at Ik ≥ 10 kA. Branch MCB characteristic chosen by inrush: B for resistive loads, C for inductive/motor. RCD types selected per appliance class: Type F for SMPS, Type B for EV wallbox and FVE inverter, Type B-S upstream as soon as any downstream is Type B (IEC 62423).

Floor-plan editor. 39 modules, one workflow, no second app.

Click-drag rooms with grid snap (50 px = 1 m). 15 room types auto-detected from the name. 27 device types across five categories. Trunk-and-branch auto-router runs debounced 250 ms after every layout change. Selects the trunk wall closest to the majority of devices, drops perpendicular 90° branches to each fixture, never diagonal.

Eleven PDFs and three pricing tiers, all sent over WhatsApp.

The same project file generates eleven PDFs, every artefact a Slovak electrician needs from quote to closeout. The shareable proposal is a UUID-tokened link the customer opens on their phone, picks a tier, draws a signature on a 340×120 px canvas, and approves. The electrician’s tracker shows Sent → Viewed → Approved inline.

Native iOS and Android, designed for one hand on a ladder.

The app runs natively on iPhone and Android. App Store and Play Store distribution, with access to the camera, haptics, and the file system. Design work continues in a dead zone on the building site: it saves to the phone and writes back to the cloud when the connection returns.

Capacitor wraps six native iOS and Android plugins (Camera, Share, Haptics, Filesystem, StatusBar, SplashScreen) into the same React shell. Every touch target meets the 44 px minimum and the iOS numeric keypad opens automatically for amperage and dimension entry. Projects cache offline through the AppStorage layer so a dead zone on a building site doesn't kill a design session; writes replay FIFO when the connection comes back, and the status bar carries the brand amber (#d97706) so the app stays locale-consistent end to end.

Two real exports from a live build.

Boring stack, predictable behaviour, EU data residency.

ElektrikPro is operated jointly by Sebrona s.r.o. and M.Z.CONNECT s.r.o. (the domain operator's company). M.Z.CONNECT s.r.o. holds the controller role for customer data under a GDPR Article 26 joint-controller agreement; Sebrona is the processor for the technical infrastructure.

By the numbers.

Every trade has a workflow nobody built the software for. Bring yours.

ElektrikPro exists because a domain operator brought the workflow and we built the system around it. The approach travels: STN-grade defaults, a tight action whitelist, eleven PDFs that close a real project, language understanding tuned to how the field talks, native mobile with offline writes. If your trade has a workflow that lives in someone’s head and not in any product, we are set up to build it.