specs for rewrite

2026-05-03 19:15:46 +02:00
parent 60771b5929
commit 49190c5d7e
10 changed files with 1534 additions and 359 deletions
@@ -0,0 +1,97 @@
+# Future Sizing and Calculation Requirements
+
+These requirements are not part of the first implementation, but the structure should support them.
+
+## Goal
+
+The app should later support rule-based protection and cable sizing.
+
+Future suggestions or checks may include:
+
+- protection device type
+- rated current
+- tripping characteristic
+- cable type
+- number of cores
+- cable cross-section
+- minimum cable cross-section based on current
+- maximum permissible cable length based on voltage drop
+- warning messages if cable length, cross-section or protection device do not match
+
+Users must remain able to manually override suggestions.
+
+## Initial Design Rule Examples
+
+These are common planning defaults, not a replacement for full norm-compliant calculation.
+
+### Lighting Circuits
+
+Lighting circuits in section `-1Fx` usually use:
+
+- protection rated current: 10 A
+- cable cross-section: 1.5 mm²
+
+Typical cable type:
+
+- non-DALI lighting: 3x1.5 mm²
+- DALI-capable lighting: 5x1.5 mm²
+
+The app should later suggest the cable type based on whether the connected luminaires require DALI or additional control cores.
+
+### Standard Single-Phase Circuits
+
+Standard single-phase circuits in section `-2Fx` usually use:
+
+- protection rated current: 16 A
+- cable cross-section: 2.5 mm²
+
+This applies to many typical socket circuits and standard single-phase loads.
+
+### Special Loads and Long Cable Runs
+
+For non-standard loads or long cable runs, voltage drop becomes more important.
+
+Examples:
+
+- instantaneous water heaters
+- socket combinations with higher connected load
+- outdoor circuits with long cable routes
+- lighting circuits with looped-through luminaires and cable lengths of 80 to 100 m
+
+The app should later show warnings or require review if voltage drop becomes critical.
+
+## Future Field: Control Requirement
+
+To support cable suggestions for lighting circuits, devices or circuits may later include a control requirement.
+
+Example values:
+
+- none
+- DALI
+- KNX
+- switched only
+- dimmable
+- other
+
+For lighting circuits:
+
+- no additional control cores: suggest 3x1.5 mm²
+- DALI required: suggest 5x1.5 mm²
+
+This must be configurable and manually overridable.
+
+## Future Voltage Drop Check
+
+A future voltage drop check may use:
+
+- phase type
+- voltage
+- circuit total power
+- apparent power or current
+- cable material
+- cable cross-section
+- cable length
+- protection rated current
+- allowed voltage drop
+
+The result should be shown as a warning or status indicator, not as an automatic forced change.