2026-09-17
Low-smoke zero-halogen (LSZH) cables are mostly used in hospitals and other places with strict environmental requirements. In a fire the cable may be destroyed, but it stops flame spread, confining combustion to a local area and preventing greater losses.
Selection points:
1. Halogenated flame-retardant cables emit corrosive halogen acid gases when burning, hindering firefighting and accelerating flame spread. Densely populated public areas should use halogen-free low-smoke flame-retardant cables.
2. Work areas with fewer people may use various flame-retardant cables.
3. Flame-retardant cables are classified A, B, and C; class A performs best and costs more. Designers must specify the class on order lists.
4. Classes A/B/C cannot be distinguished by appearance and must be guaranteed by the manufacturer — choose suppliers carefully.
5. LSZH cables have somewhat lower electrical and mechanical performance than halogenated types, so use larger bending radii when laying.
6. Avoid placing non-flame-retardant cables side by side with flame-retardant ones, or mixing different flame-retardant classes.