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Fire-resistant cable is a general term for cables with fire-resistant properties. It includes two categories: general flame-retardant cables and fire-resistant cables. Fire-resistant cables (designated ZR flame-retardant) use a polyolefin outer sheath with an oxygen index ≥28 to retard the spread of flames along their outer sheath, preventing the spread of fire. In densely populated tunnels, shafts, or cable mezzanines, fire-resistant cables of 35kV and below should be used to prevent serious accidents caused by cable fires. To ensure timely firefighting by firefighters, fire-resistant cables with low-smoke halogen-free or low-smoke low-halogen sheaths should be used when possible.