What is the difference between PVC and LSZH armoured cable?

The main difference is the outer sheath material and fire performance.
PVC armoured cable is widely used for general power distribution, industrial wiring, outdoor applications, and underground installations because PVC provides practical mechanical and environmental protection for many standard projects.
LSZH armoured cable, also called LSOH armoured cable or low smoke zero halogen armoured cable, is designed to reduce smoke and corrosive halogen gas emissions during fire. It is commonly selected for public buildings, hospitals, airports, rail systems, tunnels, data centers, commercial buildings, and other locations where people, equipment, or evacuation routes need additional fire-safety consideration.
BS 6724 is commonly used for thermosetting insulated armoured cables with low smoke and corrosive gas emission performance for fixed installations in industrial areas, buildings, or similar applications.