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In transmission systems in which a large inducing current flows into the overhead ground wires during short-circuit faults, it is essential that these wires have high conductivity. Aluminum alloy conductors, steel reinforced, have been used in the past. However, it has been shown in comparative tests that thick aluminum-clad AS strands have less deterioration of their properties due to short-circuit faults and are much better suited for use as over- head ground wires. Finally, the transient current capacities are given for various types of widely used AS ground wires.