For connecting lightweight electrical devices (such as radios, table lamps, clocks, etc.) under very low mechanical stress in households, as permitted by the relevant device regulations. The cable can also be used as a speaker cable. Notably, the conductor diameter of 6 mm² is suitable for connecting HiFi speakers. The cable is not suitable for connecting cooking and heating appliances or for outdoor use. CCA refers to bi-metallic single and multi-core cables with a copper-clad aluminum core for higher frequency applications. The so-called skin effect, also known as current displacement, is a physical phenomenon caused by higher frequency alternating currents. The current density inside the conductor decreases with increasing frequency compared to that on the outer surface.