🔌 Indian Standards (IS Codes) Every Electrical Engineer Should Keep Handy 🇮🇳

In electrical engineering, compliance is not optional — it’s the foundation of safety, reliability, and legal approval.
Indian Standards (IS Codes) issued by BIS provide structured guidance for design, installation, testing, operation, and maintenance of electrical systems.

Here’s a refined and categorized quick-reference list for practical use:

⚡ System Studies & Design

IS 13234 → Short-circuit calculation in 3-phase AC systems
IS 12360 → Voltage bands & preferred system voltages/frequencies
IS 3716 → Insulation coordination guide
IS 9676 → Reference ambient temperature for electrical equipment

🔥 Hazardous Area Classification

IS 5572 → Classification of hazardous areas (flammable gases/vapours)
IS 5571 → Selection of electrical equipment in hazardous areas
IS 13408 → Electrical apparatus for explosive atmospheres
IS 7689 → Control of static electricity

🔁 Transformers & Associated Equipment

IS 10028 → Transformer selection, installation & maintenance
IS 10561 → Application guide for power transformers
IS 1180 → Outdoor oil-immersed distribution transformers
IS 335 → Transformer oil specifications
IS 8478 → On-load tap changer (OLTC) guide
IS 4201 → Current transformer (CT) application guide
IS 4146 → Voltage transformer (PT/VT) application guide

🧰 Cables & Installation

IS 7098 → XLPE insulated power cables
IS 1554 → PVC insulated power cables
IS 3961 → Recommended current ratings for cables
IS 1255 → Installation & maintenance of power cables
IS 732 → Electrical wiring installations

🛡 Protection, Switchgear & Relays

IS 3842 → Electrical relays application guide
IS 10118 → Switchgear & controlgear installation/maintenance

🌍 Earthing & Lightning Protection

IS 3043 → Code of practice for earthing
IS 2309 → Lightning protection for buildings

💡 Lighting Engineering

IS 6665 → Industrial lighting
IS 3646 → Interior illumination
IS 1944 → Public street lighting

🔥 Fire & Electrical Safety

IS 1646 → Fire safety of buildings (electrical aspects)
IS 3034 → Fire safety in industrial buildings
IS 5216 → Safety procedures in electrical work

⚙️ Electrical Machines

IS 325 → Three-phase induction motors

📌 Why These Standards Matter

✔️ Ensure statutory compliance
✔️ Improve system safety & reliability
✔️ Reduce failures and downtime
✔️ Support inspection & audit readiness
✔️ Build professional credibility

These IS codes form the technical backbone of electrical engineering practice in India — from concept design to commissioning and maintenance.

If you’re an electrical engineer, site engineer, consultant, or student, keep this reference accessible.

💬 Feel free to add any important IS code I may have missed — let’s make this list more comprehensive for the community!

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Friday, February 20, 2026