There are usually two types of armored cable sheaths, steel tape armor and steel wire armor.
In order to allow the cable to withstand radial pressure, a double steel belt and gap winding process are used, which are called steel belt armored cables. After the cable is laid, the steel belt is wrapped around the cable core and the plastic jacket is extruded. This cable model is represented by the control cable KVV22, plastic cable VV22, communication cable SYV22, etc. Two Arabic numerals in the subscript of the cable model number, the first one: "2" represents the double strip armor; the second: "2" represents the PVC sheath, such as the use of polyethylene sheath "2 "Change to "3". This type of cable is generally used in places where the load pressure is relatively high. For example: crossing roads, squares, and roads, railroads, etc., where vibration is relatively large, suitable for laying underground, tunnels, and laying pipes.
In order to allow the cable to withstand large axial pull forces, multiple low carbon steel wire wrapping processes are used, known as steel wire armored cables. After the cable is laid, the steel wire is wrapped around the core wire at a certain pitch and then squeezed. The cable model is represented by the control cable KVV32, plastic force cable VV32, and coaxial cable HOL33. Two Arabic numerals in the model, the first: "3" for fine steel wire armor; second: "2" for PVC sheath, "3" for polyethylene sheath. This type of cable is generally used where the span is relatively large and the gap is large.
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