What is the role of Cable Sheath

The outer protective layer of plastic sheath has two kinds of structure. One is no outer protective layer and only polyvinyl chloride (PVC) or polyethylene sheath; The other is the armored layer also extruded PVC or polyethylene cover, its thickness and inner sheath the same. Because of the low working temperature of PVC, the traditional PVC outer sheath is not suitable for the high voltage crosslinked polyethylene (XLPE) cable with high operating temperature and protective layer insulation requirements. Therefore, the use of high density polyethylene CHDPE or low density polyethylene (LLDPE) as outer sheath has been very common, but no flame retardant. When laying, fire prevention measures or flame-retardant cables should be considered. The insulation level of the sheath can be improved by using HDPE as the outer sheath, and the adhesive should be used between the outer sheath and the wrinkled metal sheath.