What are the advantages of YJV cross-linked cables compared to VV plastic-impregnated cables and YZ/YC rubber-sheathed cables?

I.Differences in materials used for the basic structure:

1. YJV Cross-linked Cable: Features an XLPE cross-linked polyethylene insulation layer and a PVC/PE sheath; predominantly employs tightly stranded conductors, representing the mainstream engineering power cable specification under national standards.

2. VV Plastic Cable: Both the insulation and sheath are made of PVC (polyvinyl chloride), a traditional all-plastic cable design.

3. Rubber-sheathed cable (YZ/YC): Both the insulation and sheath are made of rubber, featuring a flexible rubber sheath, primarily used in portable devices.

II. Seven Core Advantages of YJV Compared to VV (PVC Plastic Cable):

1.Higher heat resistance temperature and greater current carrying capacity

VV and PVC can withstand long-term operation at 70°C; exposure to higher temperatures may cause them to soften and deform.

YJV cross-linked polyethylene can operate at temperatures up to 90°C over extended periods and withstand short-term high temperatures of up to 250°C in short-circuit conditions.

For the same cross-sectional dimensions, YJV cables offer approximately 15%–25% higher current-carrying capacity than VV cables, allowing for the use of smaller wire diameters under equivalent loads and reducing procurement costs.

2.Stable insulation performance with temperature resistance without melting or phase separation

PVC readily releases plasticizers at high temperatures, leading to accelerated insulation degradation and increased electrical leakage risks with prolonged exposure to heat.

The cross-linked polyethylene exhibits a chemical structure characterized by cross-linking and curing, remaining non-flowable and non-softening at high temperatures, with stable insulation resistance throughout the year.

3.Age-resistant with longer service life

Under high temperatures, enclosed cable trays, and indirect sunlight exposure, the insulation of VV will crack within 5 to 8 years.

The YJV product exhibits excellent resistance to thermal aging and environmental degradation, with a designed service life exceeding 30 years under standard operating conditions. It is widely used in building embedded installations and municipal projects, typically requiring no replacement throughout its entire lifespan.

4.Its flame retardancy is inherently superior to that of ordinary PVC plastic cables.

Under identical conditions without flame-retardant additives, XLPE cross-linked material does not drip when carbonized, whereas ordinary PVC burns and releases molten droplets that can easily ignite surrounding cables.

The ZR-YJV product easily meets the Class A flame retardancy standard, whereas VV products with ordinary flame retardancy typically only achieve Class B or C.

5.Excellent low-temperature resistance and crack resistance

Under low-temperature conditions, PVC hardens and becomes brittle, with the outer surface prone to cracking when bent or laid.

Cross-linked polyethylene maintains toughness even at low temperatures of 40°C, making it particularly suitable for outdoor applications and direct burial in cold environments during northern winters.

6.Low dielectric loss, energy-efficient

PVC insulation has high dielectric loss, and prolonged electrical current flow causes unnecessary heat dissipation.

XLPE has extremely low dielectric loss, resulting in minimal voltage drop and lower power consumption during long-distance transmission. For large-capacity distribution projects, prolonged use significantly reduces electricity costs.

7.Strong compatibility with high voltage

VV is primarily limited to low-voltage applications of 0.6/1 kV;

The YJV can be manufactured in medium-to-high voltage specifications of 10 kV and 35 kV, making it suitable for all applications from household power distribution to substation feeders.

Disadvantages: The raw material cost of YJV cables is slightly higher than that of standard VV cables.

III. Advantages of YJV Compared to YZ/YC Sheathed Cables (For Fixed Installation Applications):

1.Fixed cabling offers better cost-effectiveness and lower installation expenses.

Rubber compounds for rubber hoses are costly, with their unit price per square meter significantly higher than that of YJV.

Rubber sleeves are primarily designed for mobile applications; however, fixed embedding or cable tray installation wastes the flexibility offered by flexible materials. The YJV rigid structure is better suited for long-term permanent wiring installations.

2.With clearly defined oil-resistant and weather-resistant functions, the YJV offers enhanced stability in fixed environments.

Rubber sheaths are oil-resistant but prone to aging under sunlight; prolonged outdoor use for 1–3 years may cause cracking of the outer layer. The YJV type can be equipped with a PE outer sheath, which provides UV resistance and excellent durability against outdoor exposure, making it far superior to rubber sheaths in terms of performance for outdoor cable trays and underground installations.

3.Superior heat resistance and overload tolerance compared to rubber sleeves

The long-term operating temperature of conventional rubber is approximately 65°C; excessive loading can easily cause bulging and skin peeling.

Designed for long-term operation at 90°C, it offers ample tolerance for temporary overload conditions and is the preferred choice for densely wired distribution rooms and cable shafts.

4.Excellent performance in moisture and corrosion resistance as well as in sealed environments

Rubber is prone to absorb moisture, swell, mold, and age over time when stored in damp, sealed cable trenches.

Cross-linked polyethylene is water-resistant and acid/alkali resistant, making it particularly suitable for direct underground burial, civil defense applications, and humid basement environments.

5.Excellent formwork design for hassle-free construction

The YJV rigid cable is resistant to deformation and misalignment after installation, with the cable trays arranged in neat rows.

The rubber sheath is soft and prone to distortion and collapse; dense wiring can easily cause the outer layer to rupture.

Supplement: The only advantage of rubber sleeves:Exhibits exceptional flexibility; YC/YZ cables must be used for temporary installation of welding machines, power tools, or mobile equipment. The use of rubber-sheathed cables as a substitute for YJV cables is strictly prohibited in fixed power distribution systems.

IV. Summary of Selection Scenarios:

1. Indoor buildings, residential power distribution systems, municipal pipelines, and cable trays in distribution rooms → Prioritize YJV/YJV2 cables.

2. Upgrading existing installations, temporary low-voltage wiring for short distances with extremely limited budgets → Use VV plastic-encased cables.

3. Temporary wiring for mobile equipment, construction machinery, and handheld appliances → Use YZ/YC rubber-sheathed cables.