IS 1293:2019 is the Indian Standard (BIS) for plugs and socket-outlets of rated voltage up to and including 250 v and rated current up to and including 16 a. This standard specifies the requirements and testing methods for plugs and socket-outlets with a rated voltage up to 250 V and rated current up to 16 A, intended for household and similar purposes in India. It covers crucial aspects like dimensions, electrical safety (including mandatory shutters), mechanical strength, and material properties to ensure interchangeability and safe operation. The code is largely harmonized with the international standard IEC 60884-1.
Specifies requirements for plugs and fixed or portable socket-outlets for household and similar purposes.
Key reference values — verify against the current code edition / project specification.
| Reference | Value | Clause |
|---|---|---|
| Subject | Plugs & socket-outlets ≤ 250 V, ≤ 16 A (household) | Scope |
| Ratings | 6 A / 16 A; 2-pin & 3-pin (with earth) | Ratings |
| Safety | Shutters, earth-pin-first engagement | Safety |
| Tests | Temperature rise, dielectric, endurance, IP | QC |
| Read with | IS 732 / NBC Part 8 Sec 2 | Cross-ref |
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
IS 1293:2019 is the Indian Standard for Plugs and Socket-outlets of Rated Voltage Up to and Including 250 V and Rated Current Up to and Including 16 A — Specification. It covers the standard household plugs and sockets used in every Indian residential, commercial, and light-industrial electrical installation.
Use it when: - Procuring electrical accessories — modular switches, sockets, plug tops for residential / commercial fit-out - Verifying BIS conformance on imported or sourced accessories (BIS hologram is mandatory on every IS 1293 accessory sold in India under the QCO — Quality Control Order) - Specifying electrical layouts in interior design / MEP drawings — pin configurations, ampere ratings, panel ratings - Investigating electrical accidents — non-conformance to IS 1293 is a frequent cause of plug-pin overheating, fire, and shock incidents
The code aligns with IEC 60884-1 (general requirements for plugs and socket-outlets for household and similar purposes) but adapts to Indian three-pin geometry, climate, and voltage tolerances.
Three standard configurations under IS 1293:2019:
1. 6A / 250V — Type D (small round pins): 2-pin or 3-pin; the 'small socket' for lights, small appliances, computer chargers. Pin spacing 19 mm, diameter 4 mm.
2. 16A / 250V — Type D variant (large round pins): 3-pin with thicker pins (7.06 mm dia) and wider spacing (28.6 mm); for ACs, water heaters, kitchen high-current appliances.
3. 6A and 16A combination socket (universal): 'universal' socket accepting both 6A and 16A plugs by clever spring-loaded pin retraction. Now ubiquitous in modular wiring.
Key dimensional requirements (Clause 5): - Earth pin: 2 mm longer and 1 mm larger than line/neutral pins (ensures earth connects FIRST and disconnects LAST — IEC safety principle) - Pin material: brass (nickel-plated or natural brass, not zinc-coated mild steel which corrodes) - Insulation around plug body: thermoset polymer with minimum heat-deflection temperature 125°C (the cheap brittle 'PVC' plugs that crack on dropping are NON-COMPLIANT under IS 1293:2019)
Tests (Clauses 7-25) — extensive type-testing regime including: - Temperature rise at 1.0× and 1.25× rated current (Clause 19) - Breaking capacity test (Clause 20) - Normal operation test — 5,000 cycles of insertion/withdrawal (Clause 21) - Mechanical strength test (drop test from 1 m, 5 times) - Resistance to abnormal heat, fire, and tracking (Clauses 27-28) - Glow-wire test at 750°C (key fire-safety test added in 2019 revision) - Power supply cord retention force (Clause 25)
BIS hologram mandatory: from 2020 under the Electronics and IT Goods (Requirement of Compulsory Registration) Order, every IS 1293 accessory sold must carry the BIS hologram. Non-holographed accessories are illegal.
Typical residential socket schedule (per IS 732:2019 wiring code + IS 1293:2019 accessories):
| Location | Socket type | Circuit | |---|---|---| | General room — TV, fans, chargers | 6A 3-pin universal | 6A lighting circuit or 16A small-appliance | | Kitchen — high-current outlets | 16A 3-pin | Dedicated 16A circuit, 4 mm² wire | | Bedroom AC point | 16A 3-pin with switch | Dedicated 16A circuit | | Water heater | 16A 3-pin in IP55 enclosure | Dedicated MCB-protected circuit | | Bathroom shaver / hair-drier | 6A 2-pin with switch | Lighting circuit; never in 'zone 0' splash area | | Refrigerator (no UPS) | 6A or 16A 3-pin | Same circuit as kitchen but switched (not unswitched) |
Modular socket faceplates (Anchor, Havells, Crabtree, Schneider Easy9 / Elega, GM Modular, Legrand Mosaic) are pre-configured assemblies of IS 1293-compliant components. Procurement-wise: - Indian brand consistently means IS 1293:2019 compliance + hologram - Imported (Schneider, Legrand) — usually IS 1293 compliant but verify hologram on each accessory - 'No-name' / Chinese knock-off — often missing hologram; pin material non-spec, fire risk
Switch capacity: switches are commonly available in 6A, 16A, 25A (for high-current ACs and water heaters), 32A (for fixed loads like geysers in some configurations). Match to circuit current rating — never under-rate.
1. Using 6A socket for an AC — split AC compressor draws 6-12 A continuously and 16-24 A on starting. Running an AC on a 6A socket overheats the pins and the socket within weeks; classic cause of socket-burning electrical fires.
2. No earth connection or weak earth pin — earth pin must be solidly connected (resistance ≤ 1 Ω). Many old IS 1293 installations have earth tied to a stray earth rod or — worse — neutral. Both are dangerous. Use a dedicated earth electrode per IS 3043 with measured resistance.
3. Wrong polarity — line and neutral wired backwards. Doesn't break appliances but every switch on the socket is in the neutral path — meaning the appliance stays energized even when 'off'. Easy electric shock if you touch internal terminals. Always test polarity with a continuity tester at commissioning.
4. MCB rated above wire capacity — a 16A socket on a 2.5 mm² wire protected by a 25A MCB will let the wire overheat and start a fire before the MCB trips. MCB rating = WIRE rating, not appliance rating. 16A socket on 4 mm² wire and 16A MCB is the correct combo.
5. Buying non-BIS-hologram accessories — under the 2020 QCO, this is illegal for retail sale. But poorly-supervised renovation sites get supplied with grey-market accessories. These often fail the glow-wire test (catch fire on overheating) and lack the 5,000-cycle mechanical durability. PMC firms should verify holograms on site receipt for every batch of accessories.
6. Shaver / appliance sockets in bathroom 'zone 0' or 'zone 1' — within 60 cm of bath/shower spray zone. IS 732 prohibits these. Use only IP44+ rated accessories outside the spray zone, or dedicated shaver sockets with isolating transformer (IS 7752).
IS 1293:2019 is the current revision (replacing IS 1293:2005), with major safety improvements: - Glow-wire test at 750°C for plug body materials (the 2005 edition was 650°C). Reduces fire risk from accessory overheating. - Increased mechanical durability — 5,000 cycles vs 1,000 in the older code. - Tighter clearance / creepage distances to reduce tracking and arc risk in humid Indian conditions. - Glove-and-fingertip access protection — child safety; sockets now must have safety shutters preventing object insertion.
The BIS QCO (mandatory hologram) became effective 2020 and has materially cleaned up the Indian retail accessory market — counterfeit accessories are now harder to sell in formal retail. But informal markets (small towns, electrical bazaar areas) still carry non-compliant goods.
For new construction / fit-out projects: specify 'Switches and socket-outlets conforming to IS 1293:2019, BIS-marked' in the BOQ. Reject any accessory without visible BIS hologram. For sensitive applications (hospitals, data centres, schools), supplement with medical-grade / data-grade sockets that have additional features (locking, colour-coded, surge protection) — typically Schneider Easy9 or Legrand Mosaic ranges.
Cost reality: a BIS-licensed 16A modular socket costs ₹150-300. A non-compliant Chinese-import equivalent might cost ₹50. The savings on a 50-socket house is ₹7,500. The fire and shock risk over the next 25-year life of the wiring is not worth it. Specify quality.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Maximum Rated Voltage Scope | Up to and including 250 V | Not exceeding 440 V | IEC 60884-1:2013 |
| Standard Rated Currents | 6 A and 16 A | Preferred series includes 6, 10, 13, 16, 20, 25, 32 A | IEC 60884-1:2013 |
| Socket Shutter Provision | Mandatory for all socket-outlets | Optional, unless required by national standards | IEC 60884-1:2013 |
| Max. Temperature Rise at Terminals | 50 K | 45 K | IEC 60884-1:2013 |
| Mandatory Certification Mark | BIS Standard Mark (ISI Mark) | None specified at the international level | IEC 60884-1:2013 |
| Glow-wire Test Temp. (Parts holding live parts) | 850 °C | 850 °C | IEC 60884-1:2013 |