In the scenarios of home decoration and ordinary low-voltage civilian power distribution, XLPE (cross-linked polyethylene) insulated wires have comprehensive superior performance compared to traditional PVC (polyvinyl chloride) insulated wires. PVC only has cost advantages and is suitable for temporary and simple wiring; currently, the formal national standard home decoration fixed power distribution lines preferentially adopt XLPE insulated wires.
★. Basic Definition of Materials
PVC (polyvinyl chloride): A traditional plastic insulation material, it was the mainstream insulation material for early civilian electrical wires and ordinary sheathing wires. It has a long application history and a large market stock, and its overall performance is relatively basic.
XLPE (cross-linked polyethylene): A modified polyethylene material through cross-linking technology, which significantly improves heat resistance and anti-aging performance. It is currently the mainstream insulation material for home decoration power distribution and main power cables in the power system.
★. Core Performance Comparison
1. Heat Resistance and Current Carrying Capacity: The long-term working temperature limit of PVC is only 70℃. Under high temperatures, the insulation is prone to aging and softening, and the same wire diameter has a limited current carrying capacity, which cannot be adapted to long-term high-power loads. XLPE can withstand a long-term working temperature of 90℃, and can withstand a short-circuit temperature of 250℃ for a short period without melting. The same specification has a higher current carrying capacity, which can stably adapt to long-term operation of home decoration high-power equipment such as air conditioners, water heaters, and charging piles.
2. Insulation Electrical Performance: XLPE has high insulation resistance, good withstand voltage performance, and low dielectric loss. It ensures stable power supply operation and is suitable for all scenarios of low-voltage power distribution. PVC contains polar chlorine molecules, which have high electrical loss and poor stability in high-voltage conditions, and is only suitable for low-power and simple wiring.
3. Aging Performance and Service Life: PVC is susceptible to temperature changes and light exposure, resulting in hardening, cracking, and brittleness. The conventional service life is only 10–15 years. The lifespan in a sealed and high-temperature conduit environment is even shorter. Moreover, it releases toxic halogenated smoke during combustion, posing a significant fire hazard. XLPE has excellent resistance to high temperatures, ultraviolet rays, and aging. The national standard design service life can reach 70 years. It is low-smoke, halogen-free, and has low toxicity. It is the preferred material for high-rise buildings and fire protection circuits.
4. Environmental Adaptability and Construction Performance: XLPE is resistant to acid, alkali, oil, and moisture, suitable for complex and humid scenarios such as basements, outdoors, and underground. The material is flexible, less prone to cracking at low temperatures, and is convenient for conduit wiring construction without damaging the insulation layer. PVC has poor resistance to moisture, corrosion, and oil. The material is hard and prone to cracking at low temperatures and is easily damaged during bending. The construction difficulty is higher.
5. Cost and Compliance Attributes: The raw materials of PVC are cheap, and the price of the same specification wire is 15%–30% lower than that of XLPE. The production process of XLPE is more precise and has higher costs. The mainstream copper-core wires for home decoration in the national standard, such as BV and BVR, are all made with XLPE insulation. At the same time, PVC contains halogens and is toxic, and has been banned for use in high-rise buildings, computer rooms, and fire protection lines. XLPE and low-smoke, halogen-free XLPE are widely used in various public buildings.
★. Scene Selection Criteria
Preferred for XLPE: Home decoration main lines, sockets, air conditioners, charging piles, etc., for fixed power distribution circuits; outdoor, underground, and damp wiring; high-rise and public building power distribution, fire protection circuits; all power distribution lines that operate under full load for a long time.
Suitable for PVC scenarios: Temporary and short-term wiring at construction sites, simple lighting circuits, etc., in low-standard scenarios; can be used as the outer sheath of cables, and the "XLPE insulation + PVC sheath" structure commonly used in the industry does not affect the core power safety.
