When should I specify H07ZZ-F instead of H07RN-F?

H07ZZ-F is a Low Smoke Zero Halogen (LSZH) rubber cable. While H07RN-F is excellent for outdoor use, H07ZZ-F is mandatory for indoor public spaces, tunnels, and data centers. In the event of a fire, it does not release toxic halogen gases or dense smoke, facilitating safe evacuation and protecting sensitive electronic hardware.