IS 730 covers electrolytic copper wire for electrical and general engineering use. Minimum 100% IACS conductivity for annealed wire. This is the base conductor material used in cables (IS 694), motor windings, and electrical connections.
Specification for copper wire (electrolytic grade) for general engineering applications covering conductivity, dimensions, and mechanical properties.
Key Values
Conductivity (annealed)Min 100% IACS
Resistivity at 20°CMax 0.017241 Ω·mm²/m
Tensile (annealed)Min 200 MPa
Practical Notes
! 100% IACS (International Annealed Copper Standard) is the benchmark for electrical conductivity.
! Hard-drawn copper wire has higher strength but 2-3% lower conductivity than annealed.
! Copper wire must be stored in dry conditions — oxidation increases resistance at contact points.