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Documentation Tool

Fusebox Diagram Generator

Enter the circuits you've already planned and generate a print-ready single-line diagram with circuit schedule (Stromkreisliste) — save it, come back later, print it or export to PDF.

Updated: July 4, 2026Planning reference

Quick Answer

This tool documents circuits you've already decided — it does not plan or verify them.

Add one row per protective device, group MCBs under their RCD, then the schematic and schedule build themselves. Save locally, print to A4, or export to PDF from your browser's print dialog.

⚠ Before you start

This is a documentation and labelling aid, not installation guidance. It does not check code compliance, RCD/AFDD requirements, protection coordination, selectivity, RCD grouping, phase balancing or conductor sizing — it only draws what you type in below. Work on electrical installations must be carried out by a qualified electrician (Elektrofachkraft) per the applicable national standard based on IEC 60364 / HD 60364 (e.g. DIN VDE 0100 in Germany); always de-energise before any work.

Saved boards are stored locally in your browser only — they are not uploaded anywhere.

Board Editor

Enter your circuits

Add one row per protective device. Group MCBs/RCBOs under an RCD using the RCD-group column.

Auto-numbering

MCB, RCBO and AFDD rows are numbered automatically in order (1, 2, 3…). Main, RCD, SPD and reserve rows are not numbered — they don't feed a load directly.

Device notes (informational only)

AFDDs (arc fault detection devices, Brandschutzschalter) per IEC 60364-4-42 / DIN VDE 0100-420 are used where higher fire protection is required — e.g. sleeping areas, places of assembly, flammable-material storage, irreplaceable goods, agricultural premises. RCD types: Type A is the modern minimum for most circuits; Type AC should no longer be specified for new installations with electronic loads; Type F for frequency inverters; Type B for smooth DC faults (EV chargers, PV, VFDs). This tool records what you enter — it does not check whether a circuit needs an RCD or AFDD, nor which type.

Untitled board

Diagram poles:

Circuit schedule (Stromkreisliste)

Nr.Device / typeRatingCableLabelRCD group

⚠ Important — documentation aid only

This diagram and schedule are a documentation/labelling aid only, not installation guidance. They reflect solely the data entered above and do not verify whether a circuit requires an RCD or AFDD, RCD type selection, pole count or earthing-system selection, phase balancing, conductor sizing, protection coordination, selectivity, RCD grouping, or compliance with any national code. The phase-distribution figure is a nominal breaker-rating distribution, not a load calculation. Requirements are national and situational — work on electrical installations must be carried out by a qualified person (Elektrofachkraft) in accordance with the applicable national standard based on IEC 60364 / HD 60364 (e.g. DIN VDE 0100 in Germany). Always de-energise (isolate) the installation before carrying out any work.

Method

How this tool works

You enter one row per protective device already decided for the board — the main switch, any RCDs, and the MCBs/RCBOs feeding each circuit. Assigning an MCB to an RCD group nests it under that RCD in the diagram. The single-line schematic and the circuit schedule are both generated live from that one list, so they can never drift out of sync with each other.

Inputs

What you enter

Board title and earthing system (TN-S / TN-C-S), then per circuit: device type, rating, cable type and a label. Optionally, which RCD a circuit sits under.

Uses

Where this helps

Useful for labelling an existing consumer unit/distribution board, handover documentation, and producing a clean printed circuit schedule to stick inside the board door or hand to the homeowner.

FAQ

Fusebox diagram notes

Does this tool check whether my board is wired correctly?

No. It only draws and lists what you type in — it does not verify protection coordination, selectivity, RCD grouping, conductor sizing, or code compliance. It is a documentation aid, not an installation or design tool. Any electrical work must be planned and carried out by a qualified electrician.

Where is my board saved?

Boards are saved to your browser's local storage only, under a versioned key — nothing is uploaded to a server. This means a board persists across visits on the same browser/device, but won't appear on a different device or browser, and will be lost if that browser's storage is cleared.

Can I model a three-phase board?

Yes — switch the board to three-phase and the busbar widens to L1/L2/L3/N with conductor colours per HD 308 S2 (brown / black / grey / blue). Single-pole circuits are assigned to a phase; 3- and 4-pole devices span all three. A nominal phase-distribution readout below the schedule helps you eyeball balance — it sums breaker ratings, it is not a load calculation.

Which standards does this relate to?

Low-voltage installation rules across Europe are harmonised under IEC 60364 / HD 60364, implemented nationally as DIN VDE 0100 (DE), NF C 15-100 (FR), CEI 64-8 (IT), NEN 1010 (NL), UNE-HD 60364 (ES) and BS 7671 (UK/IE). Conductor identification colours follow HD 308 S2; AFDD provisions come from IEC 60364-4-42; installation documentation from IEC 60364 §514. This tool is a documentation aid aligned with that framing — it does not check compliance with any of them.

Learn More

Reference links

Fusebox Diagram Reference ChartIEC 60364 / HD 60364 — WikipediaDistribution board — WikipediaRCD — WikipediaAFDD / arc-fault protection — Wikipedia

Project

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Disclaimer

Documentation aid only

This tool is a documentation and labelling aid. It does not verify code compliance, RCD/AFDD requirements, RCD type selection, pole or earthing-system selection, phase balancing, protection coordination, selectivity, RCD grouping or conductor sizing, and is not a substitute for a qualified electrician's design or inspection. Installation and modification work must be carried out by a qualified electrician (Elektrofachkraft) per the applicable national standard based on IEC 60364 / HD 60364, with the installation de-energised before work begins.

Workflow

Document your distribution board before closing up the panel.

Use this tool to label circuits clearly, hand over a clean schedule to the homeowner, and keep a printed copy inside the board door.

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