Aluminum clad steel (Aluminium Clad - ACS) is produced with a high conductivity aluminum coating on the central steel wire. The aluminum layer is seamlessly and uniformly coated on the steel core. The coating does not lose its stickiness during transfer and twisting.

The thickness of the aluminum layer is at least 10% of the wire diameter and approximately 25% of the total cross-sectional area. The conductivity of the ACS wire is related to the thickness of the aluminum layer. conductivity values ​​are possible between 14% and 40% ACS. The thickness of the aluminum layer is increased according to the increase in the conductivity value.

Aluminum coated steel (ACS) has high corrosion resistance, high strength value and high electrical conductivity. These features make it very suitable for use in high voltage line ground wires. It is also used as steel core in ACSR conductors as it is used in OPGW and grounding and conductor.

At high frequency, the skin effect is an important factor. Since most of the electric current is transmitted on the outer surface of the conductor, the Aluminum layer works with 100% capacity in cases such as lightning strikes.