Fireproof Cable

Fireproof cables utilize solid round copper conductors, tightly stranded. Solid round copper conductors offer several advantages over fan-shaped conductors: When combined with mica tape, the integration of mica and conductors is tightly bound, beneficial for even distribution of electrical systems and enhancing the insulation performance of the electrical cables.

The fire-resistant layer is the first line of defense of a fireproof cableand is typically made of materials with high heat resistance, most commonly mica. Outside the conductor core, there are usually 2 or more layers of mica tape wound around, with a cross-over ratio usually not less than 30%. The width, thickness, and coverage ratio of the mica layer must be accurately ensured during the manufacturing process to prevent leakage and breakage.

The insulating sheath is the next line of defense after the fire-resistant layer. The insulating sheath is made of cross-linked polyethylene. This material also protects cables from burning and ensures their long-term operation.

The heat resistance of fireproof cables depends on the permissible temperature of the conductor and the outer sheath. The outer sheath of fireproof cables is prone to significant oxidation when being exposed to air. The higher the temperature, the more severe the oxidation process becomes. When the temperature exceeds 250°C, intense oxidation occurs, forming a layer of CuO oxide.