Electrical Wire Size & Purposes

Electrical wire size is sold in square mm unit in India. Electrical wires sizes start from 1.0 Sq mm and can go up to 6 Sq mm for domestic / home purposes. Find the chart below for the electrical wire sizes and its purposes.

Wire Size (Square mm)Functionality/Purpose
1 Sq mm Wires Earthing Purpose
1.5 Sq mm Wires Distribution purpose, from switchboard to lighting/fan points
2.5 Sq mm Wires Distribution Board (DB) to mainboards in a room
4.0 Sq mm Wires Geyser/Heaters, Electrical Induction stove, other electrical appliances which require 15 Amperes
6 Sq mm Wires For Air conditioners (up to 1.5 Tons capacity)