These wires are intended for connecting lightweight electrical devices (such as radios, table lamps, clocks, etc.) with low mechanical stress in households, kitchens, and offices. CCA refers to bi-metallic single and multi-core wires/cables with a copper-plated aluminum core for higher frequency applications. The so-called skin effect, also known as current displacement, is a physical phenomenon caused by high-frequency alternating currents. The current density inside the conductor decreases with increasing frequency compared to that at the outer surface. Special feature: CCA conductors, flexible, flat design.