Use of cables

I. Models of several common types of cables and their applications 1. VV: Power cable with polyvinyl chloride insulation and polyvinyl chloride sheathing. It can be installed indoors, in tunnels, cable trenches, pipes, as well as in areas prone to fire or severe corrosion; however, it cannot withstand mechanical stress. Steel tape armor is applied to withstand mechanical forces. 2. YJV: Power cable with cross-linked polyethylene insulation and polyvinyl chloride sheath. It can be installed indoors, in tunnels, and within pipes; it can withstand certain levels of pulling force during installation, but it cannot resist external forces. Single-core cables must not be installed in pipes made of magnetic materials. Steel tape armor is applied to withstand mechanical forces. 3. ZR-VV: Flame-retardant polyvinyl chloride insulated, polyvinyl chloride sheathed power cable. It can be installed indoors, in tunnels, cable trenches, pipes, as well as in areas prone to fire and severe corrosion, but it cannot withstand mechanical forces. Steel tape armor is applied to withstand mechanical forces. Feature: When burning in an open flame, removing the heat source causes it to extinguish automatically within ≤12 seconds. 4. ZR-YJV: Power cable with flame-retardant cross-linked polyethylene insulation and polyvinyl chloride sheath. It can be installed indoors, in tunnels, and within pipes; it can withstand a certain amount of pulling force during installation, but it cannot resist external forces. Single-core cables shall not be installed in pipes made of magnetic materials. Steel tape armor is applied to withstand mechanical forces. Feature: When burning in an open flame, removing the heat source causes it to extinguish automatically within ≤12 seconds. 5. NH-VV: Power cable with fire-resistant polyvinyl chloride insulation and a polyvinyl chloride sheath. It can be installed in indoor areas, tunnels, cable trenches, pipes, as well as in locations prone to fire and severe corrosion, but it cannot withstand mechanical stress. Steel tape armor is applied to withstand mechanical forces. Suitable for applications with special requirements, such as large-capacity power plants, nuclear power stations, subways, high-rise buildings, etc. Feature: Protects normal operation for 90 minutes in a burning environment. 6. NH-YJV: Power cable with fire-resistant cross-linked polyethylene insulation and polyvinyl chloride sheathing. It can be installed indoors, in tunnels, and within pipes; it can withstand a certain amount of pulling force during installation, but it cannot resist external forces. Single-core cables must not be installed in pipes made of magnetic materials. Steel tape armor is applied to withstand mechanical forces. Suitable for applications with special requirements, such as large-capacity power plants, nuclear power stations, subways, high-rise buildings, etc. Feature: Maintains normal operation for 90 minutes in a burning environment. II. A Brief Introduction to the Models and Performance of Power Cables Abstract: Given the wide variety of cables used for special purposes, only a brief introduction is provided here. Fluoroplastic cables designed for high-temperature environments: cables with polyvinylidene fluoride insulation and sheathing can operate continuously at temperatures up to 150 degrees Celsius; those with perfluoroethylene propylene insulation and sheathing can operate continuously at 100 degrees Celsius; while cables with polytetrafluoroethylene insulation and sheathing can operate continuously at 260 degrees Celsius... I. Models 1. Material of the sheathing and insulation layer. 　　Common types:
VV (VLV) – Power cable with polyvinyl chloride insulation and polyvinyl chloride sheath.
VY (VLY) – Power cable with polyvinyl chloride insulation and polyethylene sheath.
YJV (YJLV) – Power cable with cross-linked polyethylene insulation and polyvinyl chloride sheath.
YJY (YJLY) – Power cable with cross-linked polyethylene insulation and polyethylene sheath.
The letter “L” in the parentheses indicates a cable with an aluminum core.
Suffix 22 denotes a cable with a steel tape armor and polyvinyl chloride sheath; suffix 23 denotes a cable with a steel tape armor and polyvinyl chloride-like sheath. Suffix 32 refers to a cable with fine steel wire armor and polyvinyl chloride sheath, while suffix 33 refers to a cable with fine steel wire armor and polyvinyl chloride-like sheath. Suffix 42 denotes a cable with thick steel wire armor and polyvinyl chloride sheath, and suffix 43 denotes a cable with thick steel wire armor and polyvinyl chloride-like sheath.
The maximum operating temperature for the conductors of VV (VLV) type cables is 70 degrees Celsius; in the event of a short circuit (lasting less than 5 seconds), the maximum temperature does not exceed 160 degrees Celsius. 　　The maximum rated operating temperature for the conductors of YJV (YJLV) type cables is 90 degrees Celsius, and the maximum temperature during a short circuit (lasting less than 5 seconds) does not exceed 250 degrees Celsius. 　　Mineral-insulated cables. Magnesium oxide insulation, copper or superalloy sheath, maximum operating temperature of 250 degrees Celsius. Special-purpose types: 　　Given the wide variety of special-purpose cables, only a brief introduction is provided here. Fluoroplastic cables designed for high-temperature environments: cables with polyvinylidene fluoride insulation and sheathing can operate continuously at temperatures up to 150 degrees Celsius; those with perfluoroethylene propylene insulation and sheathing can operate continuously at temperatures up to 100 degrees Celsius; while cables with polytetrafluoroethylene insulation and sheathing can operate continuously at temperatures up to 260 degrees Celsius. NBR composite insulated cables for oil-contaminated environments, with a maximum rated operating temperature of 105 degrees Celsius. Silicone rubber cables for frequently moving environments, with a maximum rated operating temperature of 180 degrees Celsius. In addition, there are also specialized low-temperature, waterproof, pest-proof and rodent-proof cables, as well as mining cables. This post was last edited by laoyier on 2009-3-30 13:08]