Armored cable is a cable wrapped with metal tape for protection. Whether the cable is armored or not is determined by the cable model number subscript, usually indicated by numbers such as 22, 23, or 42. Below we will explain how armored cable is marked and how armored cables are designated and named.
1. How to identify armored cable and how to designate armor?
Armored cable has two digits after the model number, the first of which is the armoring code: 2 for double steel tape armor, 3 for fine round steel wire armor, 4 for fine round steel wire armor, 6 for non-magnetic metal tape armor, and 7 for non-magnetic metal wire armor. Double steel tape armored cable, designated 2, is commonly used. See the following:
YJV22 - Cross-linked polyethylene insulated steel tape armored PVC sheathed power cable.
YJV23 - Cross-linked polyethylene insulated steel tape armored PE sheathed power cable.
II. Armored Cable Naming Method
Armor is divided into steel tape armor (22, 23), fine steel wire armor (32, 33), and thick steel wire armor (42, 43).
Steel tape armored cable models include VV22, VVP22, ZRVV22, and NH-VV2;
Control cable steel tape armored cable models include KVV22, KVVP2, KVVP22, and ZR-KVV22;
Steel wire armored power cable models include VV32, YJV32, and ZR-VV32;
Steel wire armored control cable models include KVV32 and KVVP32.
Armored cable structure diagram:
III. Cable model and product designation
1. The insulation type, conductor material, inner sheath material, and structural characteristics are indicated by capitalizing the first letter of the Chinese pinyin. For example, Z stands for paper (zhi); L for aluminum (lv); Q for lead (qian); F for phase separation (fen); ZR for flame retardant (zuran); and NH for fire resistant (naihuo).
2. The outer sheath composition is indicated by a two-digit number. No number indicates no armor or outer sheath. The first digit indicates the armor, and the second digit indicates the outer sheath. For example, a thick steel wire armored fiber sheath is indicated as 41.
3. Cable models are generally arranged in the following order based on cable structure: insulation material; conductor material; inner sheath; outer sheath.
4. Cable products are indicated by model number, rated voltage, and specification. This is done by adding an Arabic numeral indicating the rated voltage, number of cores, and nominal cross-sectional area after the model number.
For example, VV42-10 3×50 indicates a power cable with a copper core, PVC insulation, thick steel wire armor, PVC sheath, a rated voltage of 10kV, three cores, and a nominal cross-sectional area of 50mm².
IV. The Function of Armored Cables
The purpose of adding armor to cables is not only to enhance mechanical protection through tensile and compressive strength and extend service life, but also to provide a certain degree of resistance to external forces and to protect against rats and other gnawing devices, preventing them from penetrating the armor and causing power transmission problems. The armor should have a large bending radius and be able to ground the cable, thus protecting the cable.
