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Fire retardancy standards and grades of cable and wire

2024-09-13

Latest company case about Fire retardancy standards and grades of cable and wire
Determining fire proof standards in the realm of cable and wire can be a cumbersome and time-consuming endeavor. However, there is no need to worry. Jiangsu Hopda Machinery has got you covered. Here is a detailed yet concise summary of all the fire proof standards and grades you will ever need to know.

 

I. Types of Fire-Proof Cables

 

  • Flame Retardant Cable: Delays flame spread, widely used due to low cost. Controls flame spread within a certain range to improve fire protection.
  • Halogen-Free Low-Smoke Flame-Retardant Cable (LSOH): Excellent flame retardant properties, low corrosiveness and toxicity when burning, and very little smoke. But mechanical and electrical properties are slightly worse than ordinary cables.
  • Low-Halogen Low-Smoke Flame-Retardant Cable (LSF): Hydrogen chloride release and smoke concentration between flame retardant and halogen-free low-smoke cables. Made of PVC with flame retardants, HCL absorbers and smoke suppressants.
  • Fire-Resistant Cable: Maintains normal operation and circuit integrity under flame combustion conditions. Produces less acid gas smoke and has improved fire resistance.

 

II. Flame-Retardant Cable Standards and Grades

 

  • IEC Flame Retardant Grade
    • IEC60332-1 and IEC60332-2 evaluate flame retardancy of single cables.
    • IEC60332-3 evaluates flame retardancy of bundled cables.
    • IEC60332-1/BS4066-1: Flame retardancy standard for single cable.
    • IEC60332-3/BS4066-3: Flame retardant standard for bundled cables.
    • IEC60332 is divided into Class A, B, C and D for quality evaluation.
  • UL Flame Retardant Standard
    • Plenum Flame Test/Steiner Tunnel Test: Highest requirement cable.
    • Trunk-level-CMR level: Commercial-grade cable.
    • Commercial Grade-CM Grade: Commercial grade cable.
    • General Grade-CMG Grade: General grade cable.
    • Home-grade CMX: Home-grade cable.
  • Smoke Density, Halogen Content and Toxicity Level
    • IEC60754-1/BS6425-1: Determines halogen gas content.
    • IEC60754-2: Measures gas acidity.
    • IEC61034-1/ASTME662: Specifies smoke density.
    • ISO4589-2/BS2863: Oxygen Index specification.
    • ISO4589-3/BS2782.1: Temperature Index specification.
    • NES713: Toxicity Index specification.
  • IEC Fire Resistance Grade
    • IEC60331 flame retardant grade: 750℃/3h fire supply temperature requirement.
    • BS6387 flame retardant grade: Higher requirements with horizontal combustion test, water spray test and mechanical shock vibration combustion test.

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No.2 Hudu road, Industrial Zone A, Guanlin Town, Yixing City, Jiangsu Province, China
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owenwang@hopda-machinery.com
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