IEC 60331-23:1999

Overview

IEC 60331-23:1999 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the test procedures and performance requirements for electric data cables subjected to fire conditions. This part of IEC 60331 focuses on ensuring circuit integrity for electric data cables used in extra low voltage circuits with no rated voltage. The standard defines how to assess the ability of these cables to maintain electrical continuity during and after exposure to fire through rigorous testing involving flame application and electrical verification.

This standard is part of the IEC 60331 series, which covers tests for various types of electric cables under fire conditions to guarantee circuit integrity and functionality during fire emergencies.

Key Topics

• Sample Preparation: Guidelines on how to prepare electric data cable samples for the fire test to ensure consistent and replicable results.
• Continuity Checking Arrangement: Methods for setting up devices to monitor electrical continuity during fire exposure.
• Test Procedure: Detailed instructions on applying the flame, maintaining the test environment, and performing electrical measurements.
• Flame Application Time: Recommended duration for flame exposure to simulate realistic fire scenarios.
• Performance Requirements: Criteria for judging whether a cable maintains circuit integrity throughout the test.
• Evaluation of Test Results: Procedures to assess cable performance with consideration of electrical continuity and physical fire damage.
• Retest Procedures: Steps to confirm test findings under specific conditions.

Applications

IEC 60331-23 is critical for manufacturers, testers, and certifiers of electric data cables used in safety-sensitive environments, including:

• Building safety systems where fire resistance of data transmission wiring is crucial.
• Industrial control systems that depend on continuous data flow during fire conditions.
• Extra low voltage communication circuits used in emergency and monitoring systems.
• Design and selection of fire-resistant cabling for infrastructure like transportation hubs, tunnels, and high-occupancy buildings.

By adhering to IEC 60331-23, stakeholders ensure that data cables can effectively maintain circuit integrity, minimizing risks of data interruption and enhancing overall fire safety.

Related Standards

IEC 60331-23 aligns with and complements several related standards within the IEC 60331 series, including:

• IEC 60331-11: Tests for electric cables under fire conditions – Circuit integrity – Part 11 details apparatus used for fire testing at flame temperatures of at least 750 °C.
• IEC 60331-21: Procedures and requirements for circuit integrity testing of cables with rated voltage up to and including 0,6/1,0 kV.
• IEC 60331-22 (under consideration): Procedures for cables with rated voltages greater than 1 kV.
• IEC 60331-25: Testing procedures for optical fibre cables under fire conditions.
• IEC 60269-3-1: Additional rules for low voltage fuses relevant to ensuring electrical safety during fault conditions.

Standards like IEC Guide 104 on safety publications provide additional context and guidance for safety-related tests and documentation, promoting consistency and reliability in fire safety standardization.

By implementing IEC 60331-23, organizations involved in fire safety and electric cable manufacturing can confidently evaluate and certify the fire performance of electric data cables, ensuring reliable data transmission and circuit integrity when it matters most.