70mm 4-core fire-resistant flexible cable with a Tough Rubber Sheath (TRS) is a heavy-duty power cable designed to maintain electrical functionality during a fire while offering high flexibility and resistance to physical and environmental stresses.
Specifications
70mm 4-core fire-resistant flexible cable with a Tough Rubber Sheath (TRS) is a heavy-duty power cable designed to maintain electrical functionality during a fire while offering high flexibility and resistance to physical and environmental stresses.
Key Features and Construction
Conductor: Typically consists of plain annealed stranded copper for excellent conductivity and flexibility, with a cross-sectional area of 70mm² for each of the four cores.
Cores: Four cores are commonly color-coded (e.g., brown, black, grey, and blue) and are used for three-phase power distribution plus a neutral wire.
Insulation: The individual cores are insulated with fire-resistant material, such as mica glass tape (MICA) and/or Cross-Linked Polyethylene (XLPE), which provides thermal stability and electrical insulation even under extreme heat.
Sheath (TRS/Rubber): The outer sheath is made of a robust rubber compound (TRS/PCP/EPR) that provides mechanical protection and resistance to abrasion, oil, grease, acids, chemicals, and UV sunlight, making it suitable for both indoor and outdoor use.
Fire Performance:
Fire-Resistant: The cable is designed to resist the spread of flames (flame-retardant to IEC 60332 standards) and maintain circuit integrity for a specified time during a fire, as required by standards like IEC 60331-25 or BS 7846.
Low Smoke Zero Halogen (LSZH/LSHF): Often, fire-resistant cables incorporate LSHF bedding and sheathing to minimize the emission of smoke and toxic fumes in a fire, which is critical for use in public areas like hospitals, shopping centers, and subways.
