The fire alarm cable standards for LSZH (Low Smoke Zero Halogen Flame Retardant Cable) primarily address combustion performance, smoke release, and toxicity control. Specific requirements are as follows:
Core Standards
Flame Retardancy
Must pass GB/T 18380.3 or IEC 60332 testing to ensure a charred surface and rapid self-extinguishing during combustion.
Fire Resistance Rating
Some models (such as the WDZN-BYJ) must meet GB/T 19216.21 (950°C/180 minutes) or higher fire resistance test standards.
Smoke Density
During combustion, the smoke transmittance must be ≥ 60% (in compliance with IEC 61034) to ensure visibility of escape routes.
Toxicity Control
Halogen-free, combustion products are H₂O and CO₂, with no release of toxic gases such as HCl and HCN (in compliance with IEC 60754-1).