CEIG & MNRE Technical Standards for Rooftop Solar (2026)

📚 Reference Guide • Evergreen Content
Rahul Sharma
Written by Rahul Sharma, B.Tech Electrical
✓ Verified Expert • Last Reviewed: June 25, 2026 • Next Review: Sept 2026

A solar installation is a high-voltage electrical plant on your roof. Strict adherence to MNRE and IS/IEC standards ensures safety and longevity.

Mounting Structures

Structures must be built to withstand wind speeds of up to 150 km/h. MNRE mandates the use of Hot Dip Galvanized Iron (HDGI) or Aluminum alloys. The minimum thickness of galvanization must be 80 microns to prevent rusting over the 25-year lifespan.

Earthing Standards

Proper earthing is non-negotiable. A standard residential plant requires a minimum of three separate earthing pits:

  • One for the Inverter (AC side)
  • One for the Solar Panels/Mounting Structure (DC side)
  • One specifically for the Lightning Arrester (LA)

Inverter IP Ratings

Solar inverters installed outdoors must have a minimum rating of IP65, making them completely dust-tight and protected against water jets from any direction. Indoor installations require a minimum of IP21.

Cabling

All DC cables connecting the panels must be UV-resistant, heavy-duty solar cables conforming to EN 50618 or equivalent IS standards, properly routed through PVC conduits.