Thriving 
TS Open-source offline LV electrical design app for single-line diagrams, load schedules, cable and breaker sizing, voltage drop, short circuit, earthing and reports.
https://pdhruv15.github.io/LV-Design-Studio/ ↗// readme
An open-source, offline desktop and browser app for low-voltage (LV) electrical design: single-line diagrams, load schedules, cable and breaker sizing, voltage drop, short circuit, earthing, protection coordination, transformer / generator sizing, power factor correction, drawings and submission reports. Projects are plain JSON files, so they sync cleanly through a Google Drive / OneDrive / Dropbox desktop folder.
Try the browser app · About the project · Calculation methods and limits · Privacy and project data
Version 2.117 (see package.json). The app is in active use and active
development.
Engineering status. The calculations are first-pass design checks, not a substitute for an engineer’s verified study. Cable data starts from built-in approximate reference values (replace them with manufacturer data in
Cables.xlsx), and fault levels use a simplified IEC 60909-0…