What is the significance of the “Low Smoke Zero Halogen” (LSZH) option for PVC/XLPE cables?

In the event of a fire, standard PVC sheathing releases dense black smoke and toxic halides. For public infrastructure, high-rise buildings, and data centers, an LSZH (or LSHF) sheath is specified. This material ensures high visibility for evacuation and prevents acid gas damage to sensitive electronic equipment.