uniwire MCP server

uniwire

Electrical diagrams, as code.

An open standard to describe electrical installations, and the reference Python library that validates them, checks them against rules and draws their single-line and multi-line diagrams.

You describe the installation (sources, protective devices, cables, loads, PLCs) in a *.uniwire.json file or in Python, and uniwire computes the drawings. No coordinates, no CAD file: a text file you can review and diff.

and validated by a published JSON Schema: .

• Format: *.uniwire.json, format 1.0, defined by the specification

• Library: pip install uniwire: Python API, code-first builder and the uniwire command line.
• Documentation:
• Web viewer: , paste a document to validate, check and draw it in the browser.

Features

conductor (L1, L2, L3, N, PE, PEN) from the single-line data, with no extra input.

• Single-line and multi-line diagrams from the same document: the multi-line view derives every

RCDs, RCBOs, fuses, switch-disconnectors, contactors, motor starters, transfer switches, SPDs, protection relays, instrument transformers, insulation monitors; busbars, boards, terminal blocks; lighting, sockets, heating, motors, EV chargers, modular PLCs and more.

• 53 node types: utility grid, transformers, generators, UPS, PV, batteries, inverters; breakers,

interlocks, trips, measurements and data buses are links. A terminal / connectivity-node graph is derived automatically, with CIM, IFC and IEC 61850 SCL mappings.

• Tree + links: the power tree is the backbone; transfers, bus ties, infeeds, earthing, control,

errors (calibre instead of in_A is caught), extensions live in ext. Templates declare a device once.

• Closed typing and unit-suffixed fields: inA, idnmA, sectionmm2, pkW; unknown fields are

capacity), plus PLC consistency checks.

• Rule profiles: core (always), nfc15100 (French dwellings), iec60364 (cable current-carrying

on any node or PLC module, aggregated to CSV (uniwire bom).

• Bill of materials: structured product references (manufacturer, part number, range, accessories)

drawn on the multi-line diagram, and CSV exports: wire list (uniwire wires), wire marker list (uniwire markers), cable schedule (uniwire cables); uniwire marks --write freezes the marks.

• Wire and cable marking: marking rules per view (manual, sequential, per potential, pattern), marks

source, status or voltage level.

• Colour modes: conductors in their IEC 60445 or North-American colours, or colouring by phase,

enclosure frames, title block, revisions and notes. SVG output is deterministic and diff-friendly; the multi-sheet PDF has clickable links between sheets.

• Sheets: paper size, sub-tree views, automatic sheet splitting with cross-references, circuit schedule,

stable ids (uniwire describe), id-based edits (uniwire patch), an MCP server (uniwire-mcp, stdio) and a hosted MCP endpoint at , plus llms.txt for assistants (full reference card included). Setup for ChatGPT, Claude, Cursor and VS Code:

• English and French rendering, selected per document with meta.lang.
• LLM tooling: a reference card generated from the model (uniwire card), a text outline with

Shortened. The full README is on GitHub.