YJV and VV cables are two different types of cables with different insulation materials. YJV cables are generally preferred for indoor permanent projects. VV cables are generally used in low-voltage systems, while YJV cables are mostly used in high-voltage systems. YJV cables are superior to VV cables in terms of temperature, pressure, and corrosion resistance, but they are more expensive.
VV cables are made of thermoplastic polyvinyl chloride (PVC) insulation and PVC sheathing.
YJV cables are made of thermoset polyvinyl chloride (XLPVC) insulation and PVC sheathing.
Precisely because of these different materials, the maximum permissible long-term operating temperatures for VV and YJV cables are different.
1. The conductor of VV (VLV) cables has a rated maximum operating temperature of 70°C, and the maximum temperature during a short circuit (lasting less than 5 seconds) does not exceed 160°C.
2. The conductor of YJV (YJLV) cables has a rated maximum operating temperature of 90°C, and the maximum temperature during a short circuit (lasting less than 5 seconds) does not exceed 250°C.
Therefore, the two cables have different current carrying capacities, with YJV having a higher current carrying capacity.
YJV is suitable for most locations, while VV is only suitable for locations with no special requirements. YJV can be used in both low and high temperature environments, while VV is only suitable for normal temperature environments. YJV is non-toxic when burned, while VV produces large and toxic smoke.
VV is a copper-core PVC-insulated and PVC-sheathed cable. It is typically installed indoors, in tunnels, and in ducts. The long-term operating temperature must not exceed 65°C. The cable installation environment temperature should not fall below 0°C, and the cable operating environment temperature must not fall below -40°C.
YJV is a copper-core XLPE-insulated and PVC-sheathed cable. It is installed indoors, in tunnels, and in ducts and cannot withstand mechanical stress. The long-term operating temperature of the core must not exceed 80°C. No heating is required when installed in an ambient temperature of at least -15°C.
VV cable should not be used at temperatures below -15°C.
Cross-linked polyethylene insulated cable (YJV) has a greater current carrying capacity than VV cable of the same cross-section. YJV cable also boasts stronger mechanical properties and a wider range of applications.
Secondly, the two differ in their production equipment and manufacturing processes:
VV is a plastic cable, while YJV is a cross-linked cable. Its insulation layer performs better than plastic cable.
YJV simply undergoes a cross-linking treatment on the insulation material to increase its heat resistance, while VV does not.
YJV cable has an operating temperature of 90°C, while VV only has 70°C. YJV cable has a higher current carrying capacity for the same cross-sectional area.
The conductor of VV cable is rated for a maximum operating temperature of 70°C, and in the event of a short circuit (lasting less than 5 seconds), the maximum temperature does not exceed 160°C.
The conductor of YJV cable is rated for a maximum operating temperature of 90°C, and in the event of a short circuit (lasting less than 5 seconds), the maximum temperature does not exceed 250°C.
YJV offers advantages over VV in the long term (such as longer service life), but is more expensive than VV. From the maximum allowable short circuit temperature: YJV is 250 degrees, VV is 160 and 140.
