What is the role of wire and cable sheathing?

I. What is the role of wire and cable sheathing? Cable sheathing is a protective layer covering the outside of the cable insulation, it and the conductor, insulation, collectively known as the three major components of the cable. Typical sheathing structure, including the sheath (inner sheath) and outer sheathing. 1, the role of the cable inner sheath: the inner sheath is wrapped in the cable insulation on the protective cover layer, to prevent the insulation from moisture, mechanical damage, and light and chemical corrosive media, etc., but also can flow through the short-circuit current. The inner sheath has metal wrong sheath, flat aluminum sheath, wrinkled aluminum sheath, copper sheath, comprehensive sheath, as well as non-metallic plastic sheath, rubber sheath and so on. Metal sheath is mostly used for oil-impregnated paper-insulated cables and 110kV and above cross-linked polyethylene-insulated power cables; plastic sheath can be used for a variety of plastic-insulated cables; rubber sheath is generally used for rubber-insulated cables. 2, the role of the outer cable sheath: the outer sheath is wrapped in the cable sheath (inner sheath) outside the protective covering layer, mainly to play a mechanical strengthening and corrosion prevention. Commonly used cables have an inner sheath for the metal sheath of the outer layer and inner sheath for the plastic sheath of the outer layer. Metal sheath of the outer protective layer generally consists of a liner layer, armor layer and the outer layer is composed of three parts. Liner layer is located between the metal sheath and armor layer, armored liner and metal sheath anti-corrosion role. Armor layer is metal belt or metal wire, mainly plays a mechanical protection role, the metal wire can withstand tensile force. The outer layer is outside the armor layer, and plays a role of anti-corrosion for the metal armor. The liner layer and the outer cover layer are made of asphalt, PVC tape, impregnated paper, PVC or polyethylene sheath and other materials. According to the various cables used in different environments and conditions, the composition of the outer sheath structure is also different.

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