All Aluminium Conductors (AAC) are manufactured from electrolytically refined (E.C. Grade) aluminium, containing a minimum of 99.5% aluminium by weight. The aluminium used has a minimum conductivity of 61%. AAC conductors are used mainly in urban areas where the spacing between supports is small and thereby the supports are relatively closer to each other. All Aluminium Conductors are made up of one or more strands of aluminium wire depending on the required current carrying capacity and used specially as bus conductors at sub-stations. AAC conductors are also used extensively in coastal areas because they have a very high degree of corrosion resistance. The stranded All Aluminium Conductor (AAC) are made up of concentric-lay-stranded aluminium wires only. The conductor may be made up of 7, 19, 37, 61 or more wires in 1, 2, 3, 4 or more layers around a central wire. Each successive layer shall have six more wires than the layer immediately beneath. For a given cross-sectional area, the conductor becomes more flexible as the number of wires is increased (with a corresponding decrease in size of each wire).
When All Aluminium Conductors are to be used in overhead lines, full hard drawn temper wires are used. The illustration below shows some typical stranding patterns.
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