Distribution Panel Builder
An interactive tool for laying out low-voltage distribution panels (DB, MDB, SDB). Allows you to place modular devices on DIN rails, verify enclosure fill ratio, calculate heat dissipation, and generate a bill of materials.
Automatically checks layout compliance with regulatory requirements for spare capacity (minimum 15% free space per PUE/IEC), protective device selectivity, and permissible internal temperature rise.
Features
- Modular device placement on DIN rails
- Automatic heat loss calculation inside the enclosure
- Panel fill ratio control (minimum 15% reserve per standards)
- Incoming breaker and RCD selection
- Protective device selectivity verification
- Single-line diagram generation
- Bill of materials export to Excel/PDF
Standards
- IEC 61439 — Low-voltage switchgear and controlgear assemblies
- GOST R 51321.1 (IEC 60439-1) — LV switchgear assemblies
- PUE — Russian Electrical Installation Code, Chapter 3.1
Frequently asked questions
How many modules does an RCD take?
A 2-pole RCD takes 2 modules, an RCBO 2 modules, a 1-pole MCB 1 module. A meter takes 2–6 modules.
Which panel for an apartment?
24–36 modules for a typical apartment: 8–12 groups, 2–4 RCDs, meter and 25% spare. For a house — 36–54 modules.
Why keep spare capacity?
25% spare covers future groups — AC units, induction cookers, EV chargers. Replacing a full panel is expensive.