Final answer:
The safest cable to use to prevent harm from toxic fumes during a fire is LSZH (Low Smoke Zero Halogen), as it emits minimal smoke and no halogen.
Step-by-step explanation:
To prevent harm from toxic fumes during a fire, the safest cable type to use is LSZH (Low Smoke Zero Halogen). This type of cable is designed to emit a minimal amount of smoke and no halogen when exposed to high heat or fire, thus reducing the risk of toxicity and enhancing safety. In contrast, PVC (Polyvinyl chloride) cables can release toxic chlorine gas when burned, Plenum cables are designed for use in air handling spaces and need to pass specific flammability tests but this doesn't necessarily mean they are low-smoke or zero-halogen, and UTP (Unshielded Twisted Pair) refers to the structure of the cable rather than its fire or smoke properties. Therefore, LSZH cables are the clear choice for environments where fire safety is a significant concern.