Low Smoke Halogen-Free (LSZH) Cables: WDZ-YJY Series Types, Specifications, Applications, Advantages & Disadvantages

What Are Low Smoke Halogen-Free (LSZH) Cables?

Low Smoke Halogen-Free (LSZH) cables, also known as low smoke zero halogen power cables, are designed for high-safety electrical installations where fire protection and environmental safety are critical.

Typical models include:

• WDZ-YJY: Copper core XLPE insulated, polyethylene sheathed LSZH flame-retardant power cable

• WDZN-YJY: Copper core XLPE insulated, polyethylene sheathed LSZH flame-retardant fire-resistant power cable

• WDZ-YJY22: Steel tape armored LSZH flame-retardant power cable

• WDZN-YJY22: Steel tape armored LSZH fire-resistant power cable

These cables are widely used in critical infrastructure and high-risk environments.

Voltage Ratings and Cable Structures

LSZH power cables are suitable for rated voltages:

0.6/1 kV, 1.8/3 kV, 3.6/6 kV, 6/10 kV, 8.7/15 kV, 12/20 kV, up to 26/35 kV systems.

Common core configurations include:

• Single core

• 2-core

• 3-core

• 4-core

• 5-core

• 3+1 core

• 3+2 core

• 4+1 core

Standard conductor sizes range from:

1.5 mm² to 300 mm²

Applications of LSZH Cables

Low smoke halogen-free cables are widely used in environments where safety and visibility during fire are critical:

• Nuclear power plants

• Subway and metro systems

• Data centers and computer control rooms

• High-rise buildings

• Airports and hospitals

• Broadcasting and communication centers

• Military and defense facilities

• Oil platforms and petrochemical plants

• Emergency lighting and fire protection systems

• Dense population areas with poor ventilation

These applications require low toxic emission and high fire safety performance.

Advantages of LSZH Cables

1. Environmental Safety

LSZH cables are halogen-free and free from heavy metals such as lead and cadmium. During combustion, they produce very low toxic smoke, improving survival and evacuation chances in fire accidents.

2. Fire Safety Performance

They significantly reduce flame spread and smoke density, improving visibility for emergency evacuation.

3. Corrosion Resistance

No release of acidic gases such as hydrogen chloride (HCl), protecting electrical equipment and metal structures from corrosion.

4. Long Service Life

High chemical stability, UV resistance, ozone resistance, and strong mechanical durability ensure extended cable lifespan.

Disadvantages of LSZH Cables

1. Higher Cost

LSZH compounds such as aluminum hydroxide and magnesium hydroxide increase production cost compared to PVC cables.

2. Reduced Flexibility

LSZH cables are generally harder, making installation and bending more difficult in some applications.

3. Compatibility Limitations

Some older cable accessories and installation systems may not be fully compatible, requiring adaptation or replacement.

Why Choose LSZH Power Cables?

Although LSZH cables are more expensive and slightly harder to install, they are the preferred solution in modern safety-focused electrical infrastructure, especially where human safety and equipment protection are critical priorities.