Per-circuit cross-section recommendation as a separate module attached to
the circuit list. It never writes project data itself: "Übernehmen" applies
cable type, cross-section and length through the regular circuit.update
command, so revisions and Undo/Redo stay intact.
- Pure domain module (src/cable-sizing) with IEC 60364-5-52:2009 Annex B
tables for PVC and XLPE, copper and aluminium, methods A1, A2, B1, B2, C,
D1, D2 and E. Every value was cross-checked against public reproductions;
where sources differ the lower value is used (docs/cable-sizing-module.md).
- Temperature and grouping between table values round to the safer value;
values outside the tables return no result instead of a factor of 1.
Ground methods use B.52.18 (D2) and B.52.19 A (D1).
- Overload protection: circuit-breakers In <= Iz; gG fuses additionally
I2 <= 1.45 Iz with I2 = 1.6/1.9/2.1 In.
- Inputs prefilled from the circuit: power, phase (group or device rows),
project voltage, power-weighted cos phi, length and protective device.
- Opened from a "Leitungsberechnung" button in the row actions, not from a
grid cell, so cable cells keep the spreadsheet behavior.
- Stateless API under /api/cable-sizing; no database table or migration.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- circuit-list-editor-api.md: next-identifier moved under
/projects/:projectId and now documents its 404 scoping behavior.
- current-architecture.md: clarify that the BMK trigger register's
DB-level normalization is ASCII-only and describe the added
application-level Unicode-aware uniqueness check that closes the
umlaut gap; note the additive migration 0006 indexes.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
