The Amored Optical Fiber Cable used for outdoor in-ground wire has aluminum and copper wires. The insulation material of the cable is a high-quality silicone material commonly known as semiconductor material. The high voltage now has aluminum wires, but this year the National Grid has been replaced by more copper, and indoor use is generally copper. However, aluminum was also used before the 1980s, and hard wires are generally used for indoor use，the middle copper core is single.
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