What do the letters on common cable models represent?

1.Basic Principles:

 It is essential to understand that all cable models adhere to the national standard coding system, which consists of [application category + conductor type + insulation material + sheath material + structural characteristics + derivative code].

II. Segmented Interpretation:

The following is interpreted in sections from left to right, with each letter explained individually:

(1)First position: Purpose/Category Code (first letter): 

(2)Insulation layer code (second and third digits, cable core):

(3)Sheath code (after insulation designation, indicating outer material): 

(4)Armor/Structure Number (number at the end of the model; 22 and 32 are the most common):

1. First digit: Armor type

2: Double steel tape armor (pressure-resistant and impact-resistant, suitable for direct burial: YJV22)

3: Fine steel wire armor (tensile-resistant, suitable for deep wells or overhead installations on slopes: YJV32)

4: Thick steel wire armor (high-tensile strength, ideal for river crossings)

2.Second digit: Outer sheath

   2: PVC outer sheath   

   3: PE (polyethylene) outer sheath

Example: YJV22 = Cross-linked insulation + PVC sheath + steel tape armor + PVC outer sheath

(5)Soft-wire/multicore shielded types (RV, RVVP)

|R| Soft conductor（Twisted multi-strand copper wire, flexible cable）|RV、RVV、RVVP|

|P| shielding layer （Copper mesh shielding for interference resistance）|RVVP Control Line Shielding |

|S| multiple twin | RS485 Communication Twisted Pair Cable |

III. Detailed breakdown of popular models on the market:

1. BV: B-type wiring cable + V-layer PVC insulation → single-core rigid cable for indoor wall-mounted wiring systems

2. BVR: B – wiring; V – insulation; R – flexible conductor → multi-strand flexible copper wire, used for distribution box wiring. 

3. VV: V – PVC insulation; V – PVC sheath → fully plastic power cable, suitable for legacy projects. 

4. YJV: YJ – cross-linked insulation; V – PVC sheath → mainstream power cable for national standard applications. 

5. YJV22: Cross-linked insulation; PVC sheath; steel tape armor; outer sheath → buried armored cable. 

6. RVV: R – flexible conductor; V – insulation; V – sheath → multi-core flexible sheathed wire, used for equipment wiring. 

7. RVVP: RVV core; P – shielding; used for shielded control lines and security monitoring signal lines. 

8. ZR-YJV: flame-retardant cross-linked power cable; NH-YJV: fire-resistant cross-linked cable. 

9. PV1-F: dedicated cross-linked cable for photovoltaic systems, specifically designed for DC solar power stations.

IV. Additional Fun Facts:

1.Number at the end of the model: e.g., 3×10+1×6 – indicating a three-phase, four-wire specification with 3 cores of 10 mm² and 1 core of 6 mm².

2.Voltage ratings: 0.6/1 kV：low-voltage general-purpose cables for civil and industrial applications; 8.7/10 kV – high-voltage cables.