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Introduction of IEC60331 Standard

Here's a more polished and professional version of your technical explanation about IEC fireproof cable standards:

Understanding IEC Standards for Circuit Integrity During Fire (Fireproof Cables)

When discussing fireproof cables, we refer specifically to cables that maintain circuit integrity during combustion. The IEC series provides comprehensive testing standards, with key differences as follows:

1. IEC 60331-21/23/25 Series

  • IEC 60331-21: Tests power/control cables (rated voltage ≤1.0kV)

  • IEC 60331-23: Tests data/communication cables (rated voltage ≤110V)

  • IEC 60331-25: Tests optical fiber cables
    Common Parameters:

  • Flame temperature: 750°C

  • Duration: 90 minutes

  • No mechanical shock applied

2. IEC 60331-1/2/3 Series
These standards all apply to cables ≤1.0kV, differentiated by:

  • Part 1: Cables >20mm diameter

  • Part 2: Cables ≤20mm diameter

  • Part 3: Cables ≤20mm tested in metal conduit
    Key Characteristics:

  • Flame temperature: ≥830°C

  • Duration options: 30/60/90/120 minutes

  • Includes mechanical vibration during test

Technical Notes:

  1. The 60331-1/2/3 series represents more rigorous testing due to:

    • Higher temperature threshold

    • Additional mechanical stress

    • Flexible duration options

  2. Selection guidance:

  • Building infrastructure typically requires 90-120 minute ratings

  • Industrial applications often specify the 830°C series

  • Telecom/data applications use the 750°C series

This standardized approach ensures cables maintain functionality during fire emergencies, with appropriate specifications for different applications and risk profiles.