Indian earthing and lightning-protection work is governed mainly by two codes: IS 3043, the code of practice for earthing, and IS 2309, the older code of practice for protection of buildings and structures against lightning (now largely superseded by IS/IEC 62305). Knowing what each covers, and how they map to the international standards, is what lets a specifier write a clean tender and a buyer confirm compliance. This guide explains them.
1. IS 3043 — the earthing code
IS 3043 (Code of Practice for Earthing) is the core Indian earthing standard. It covers electrode types and minimum sizes (rod, pipe, plate), earth-resistance targets for different installations, the treatment of soil to lower resistance, step-and-touch safety, and the testing and maintenance regime. When a tender says "earthing to IS 3043", it is invoking these requirements.
2. IS 2309 and IS/IEC 62305 — lightning protection
IS 2309 (Protection of Buildings and Allied Structures against Lightning) is the traditional Indian lightning-protection code, based on the conventional (Franklin/mesh) approach and the rolling-sphere concept. Modern practice increasingly follows IS/IEC 62305, the risk-based international standard adopted in India, while ESE (early-streamer) systems are applied under NF C 17-102. A specifier should confirm which lightning standard the project mandates, because it decides whether conventional or ESE protection is allowed.
3. How they map to international standards
| Indian standard | Related international standard |
|---|---|
| IS 3043 (earthing) | IEEE 80 (substation grounding), IEC 60364 (installations) |
| Copper bonded rod thickness | UL 467 (250 micron copper grounding electrode) |
| Lightning components | IEC 62561 series (rods, conductors, electrodes) |
| IS 2309 / IS-IEC 62305 (lightning) | IEC 62305, and NF C 17-102 for ESE |
4. Other codes a specifier meets
- IS 4759 — hot-dip galvanised coating on iron/steel (defines GI coating thickness).
- NBC 2016, Part 8 — building lightning-protection requirement thresholds.
- IEC 62561-7 — earth-enhancing / conductive backfill materials (conductive concrete).
- CPRI test reports — independent fault-current verification often demanded in tenders.
5. What a buyer should confirm
- Electrode: IS 3043 minimum size met, and copper thickness to UL 467 (250 micron) where specified.
- Lightning: which standard applies (IS 2309 / IS-IEC 62305 for conventional, NF C 17-102 for ESE) and the air-termination sized to it.
- Test evidence: CPRI (or equivalent) fault-current test reports for the products.
- Resistance target met and verified after installation, per IS 3043.
- Materials: GI coating to IS 4759, or copper bonded, matched to the soil and life.