Use 1.5 sq mm for lights and fans, 2.5 sq mm for sockets, 4 sq mm for ACs, geysers and heavy kitchen points, and 6 or 10 sq mm for the main supply from the meter. Always match the MCB to the wire.
Wire size by circuit
| Wire | Use for | Usual MCB |
|---|---|---|
| 1.5 sq mm | Lights, fans, small loads | 6 A or 10 A |
| 2.5 sq mm | 6 A and 16 A sockets, fridge, washing machine | 16 A |
| 4 sq mm | AC, geyser, induction cooktop, heavy kitchen points | 20 A |
| 6 sq mm | Main supply for a flat or shop, sub-distribution boards | 32 A |
| 10 sq mm | Main supply for a larger house or office | 40 A |
These suit copper house wire run in conduit in a normal home. Long runs, many wires bunched in one conduit, or hot locations need the next size up. Your electrician follows the Indian wiring code (IS 732) and the wire maker's current tables for the final choice.
Colour code
| Colour | Conductor |
|---|---|
| Red, yellow, blue | Phase (single-phase: usually red) |
| Black | Neutral |
| Green or green-yellow | Earth |
Which type of wire?
Choose flame-retardant wire for homes. FR wire resists the spread of fire; FR-LSH also gives less smoke and halogen gas, which helps people escape; HFFR (halogen-free) is used in hospitals, malls and public buildings. Polycab house wires come in 90 m and 180 m coils in every colour.
Products
Need help choosing?
Send us the rating, the load or a photo of the nameplate on WhatsApp, and we will confirm the right model, availability and rate.
Values are typical guidance for Indian 230 V single-phase and 415 V three-phase supplies. Always follow the equipment nameplate, the manufacturer's instructions and your licensed electrician, who is responsible for the final selection and installation.