150 mm² AAC refers to a 150 square millimeter All Aluminum Conductor, a type of electrical cable used in overhead power transmission and distribution lines. It's a stranded conductor made entirely of aluminum wires, known for its good conductivity and relatively low cost. Here's a more detailed explanation: AAC (All Aluminum Conductor): This type of conductor is made by stranding multiple layers of aluminum wires together. The wires are typically made of high-strength aluminum alloy. 150 mm²: This indicates the cross-sectional area of the conductor, meaning the total area of all the aluminum wires combined is 150 square millimeters. Application: AAC conductors are commonly used in overhead power lines, particularly in urban areas where the spans are relatively short and the mechanical stress on the conductor is not extremely high.