Plastic wire and cable laying, will be the role of various mechanical force, such as bending, tension, torsion, pressure, shock and vibration. All the mechanical force, applied to the cable will cause some damage to the cable. To protect the integrity of the structure and electrical properties of the cable to improve the life of the cable, the cable's outer sheath to increase armor layer is very necessary.
Armored cable usually has two, steel wire armor and armored.
To allow the cable to withstand the radial pressure, the use of double strip, the gap around the package process, known as the steel armored cable; into the strip around the cable after the cable core wrapped in, and then extruded plastic jacket. This cable type of representation such as control cables KVV22, plastic power cable VV22, communication cables SYV22, and so on. The cable in the two models under the standard Arabic numerals, the first one: "2" indicates dual tape armouring; the second: "2" indicates that PVC jacket, such as polyethylene sheath to "2" changed to "3" button. The main types of cables usually used in relatively large bearing pressure of the occasion. For example say: through roads, squares and the larger side of the road vibrations, railroad, etc., suitable for underground tunnels and the laying of pipe wear.
To allow the cable to withstand large axial tension, the use of multiple low-carbon steel wire wrapping technique, known as the steel wire armored cable. After the wire cable into the pitch around the package by a certain line and then squeeze in the core jacket, this cable type of representation such as control cables KVV32, plastic power cable VV32, coaxial cable HOL33 and so on. Models of the two Arabic numerals, the first one: "3", said steel wire armored; the second: "2" indicates that PVC jacket, "3" means polyethylene sheath. The type of cable is generally used in large span, laying larger gap occasions.