LSZH Cable (Low Smoke Zero Halogen): Technical Overview

LSZH Cable (Low Smoke Zero Halogen): Technical Overview

LSZH cable, also known as low smoke zero halogen cable, uses insulation and sheath compounds that emit limited smoke and minimal acidic or halogen gases during combustion. It is commonly specified for enclosed public spaces, underground stations, tunnels, airports, hospitals, commercial buildings, data centers, and other environments where visibility and toxic gas release must be controlled during a fire. Unlike standard PVC cables, LSZH cables reduce smoke density and avoid significant release of hydrogen halides when exposed to fire. This supports safer evacuation and reduces corrosion risk to nearby electrical and electronic equipment. Typical constructions use copper or aluminum conductors with LSZH insulation and LSZH outer sheaths, and may include flame retardant or fire resistant designs depending on application requirements. Key selection parameters include rated voltage, conductor cross-section, number of cores, flame retardancy class, fire resistance rating, smoke density, acidity, halogen content, temperature rating, and installation method. For international projects, LSZH cables may reference IEC 60754, IEC 61034, IEC 60332, EN 50525, EN 50264, and applicable local standards. Manufacturers typically support smoke density tests, acidity tests, halogen content tests, flame propagation tests, type tests, routine tests, and third-party certification.

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