Definition
IS 875 is the Indian Standard for design loads (other than earthquake) for buildings and structures. Part 3 covers wind loads — the primary reference for solar PV structural design in India alongside IS 800 (steel) and IS 456 (concrete).
IS 875 Parts
| Part | Loads |
|---|---|
| 1 | Dead loads |
| 2 | Live loads |
| 3 | Wind loads (most relevant for solar) |
| 4 | Snow loads |
| 5 | Special loads |
Wind Design
Basic wind speed × terrain category × topography × importance × structure factor = Design wind pressureTerrain categories: 1 (exposed) to 4 (sheltered). Topography factor for hills, ridges.
Key Takeaways
- IS 875 = Indian structural load standard (Part 3 = wind, most relevant).
- Solar ground mount and rooftop wind design in India references IS 875.
- Basic wind speeds: 33–55 m/s across India.
- Companion to IS 800 (steel) and IS 456 (concrete).
- Required for CEIG-stamped structural calculations.
Frequently Asked Questions
4 commonly searched questions about IS 875.
What is IS 875?
Indian Standard for design loads for buildings — Part 1 (dead), Part 2 (live), Part 3 (wind), Part 4 (snow), Part 5 (special). Used for solar PV structural design in India.
What design wind speed does IS 875 use?
Basic wind speed map of India: 33 m/s (coastal) to 55 m/s (most of India). Coastal cyclone-prone regions: 50–55 m/s. Updated periodically.
Is IS 875 equivalent to ASCE 7?
Conceptually similar — both prescribe wind, snow, seismic load methodologies. IS 875 (India) vs. ASCE 7 (US). Numerical values and coefficients differ.
Latest IS 875 edition?
IS 875 (Part 3): 2015 (wind). Periodic revisions. Engineers must reference the current edition for CEIG submissions.
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