This standard specifies the requirements for solid, stranded, and flexible circular aluminium conductors used in insulated electrical cables. It details the material properties, temper grades (H2/H4), construction, dimensions, and test methods, including electrical resistance and mechanical strength.
Specifies requirements for aluminium conductors used in insulated cables and flexible cords.
Quick Reference Values
Maximum volume resistivity of aluminium at 20°C0.028264 ohm.mm²/m
Temperature coefficient of resistance for aluminium at 20°C (α)0.00403 per °C
Minimum elongation at break for H4 grade aluminium wire8%
Maximum resistance of 2.5 sq.mm solid conductor at 20°C7.41 ohm/km
Maximum resistance of 16 sq.mm stranded conductor at 20°C1.15 ohm/km
Key Formulas
Rt = R20 [1 + α(t - 20)] — Resistance correction for temperature
Practical Notes
This standard is for the conductor only; the final properties of the finished product are governed by the specific cable standard (e.g., IS 694, IS 1554) which references this document.
The resistance values specified are maximums at 20°C. Actual operating resistance will be higher due to conductor temperature rise under load, which must be accounted for in voltage drop and current rating calculations.
This part (Part 2) covers circular conductors. For shaped (sector) aluminium conductors, refer to IS 10810 (Part 3).