IEC 60598-2-24:2013

IEC 60598-2-24:2013 Overview

IEC 60598-2-24:2013 is an international standard that defines particular requirements for luminaires with limited surface temperatures. Published by the International Electrotechnical Commission (IEC), this second edition supersedes the 1997 version and introduces technical revisions to ensure luminaire safety in applications where temperature limitations on outer surfaces are critical.

The standard covers luminaires designed for use with electric light sources supplied by voltages not exceeding 1,000 V. It specifically addresses scenarios where there is a risk of thermal damage, combustion, or material degradation due to surface heat, but excludes luminaires intended for explosive gas or dust atmospheres.

Key Topics of IEC 60598-2-24:2013

• Limited Surface Temperature Requirements
  This standard specifies maximum allowable temperatures on outer surfaces of luminaires to prevent thermal hazards:

  • Horizontal surfaces must not exceed 90°C under normal operation.
  • Vertical surfaces must not exceed 150°C.
  • Glass surfaces of light sources exposed to dust should not exceed 150°C to reduce dust ignition risks.

• Degree of Protection (IP Rating)
  The required degree of protection has been updated from IP6X to IP4X to harmonize with international wiring rules:

  • Minimum protection: IP4X for general applications.
  • IP5X for environments with dust accumulation.
  • IP6X for environments with conductive dust.

• Thermal and Endurance Testing
  Comprehensive endurance and thermal tests verify compliance for normal, abnormal, and fault conditions. These tests confirm the luminaire limits on temperature during continuous operation and potential malfunctions.

• Marking and Classification
  Luminaires conforming to this standard must bear a special symbol indicating their limited surface temperature characteristic. Manufacturer documentation must clarify the intended application environment based on dust conditions:

  • No unusual dust accumulation.
  • Non-conductive dust accumulation possible.
  • Conductive dust accumulation possible.

• Construction and Safety Provisions
  The construction requirements follow IEC 60598-1 with enhancements that address dust protection, earthing, wiring, and protection against electric shock, ensuring safe installation and operation.

Practical Applications

This standard applies primarily to luminaires used in environments where surface heating can cause fire hazards or material damage but does not involve explosive atmospheres. Typical applications include:

• Residential and Commercial Lighting
  Where proximity of luminaires to combustible surfaces, materials, or dust accumulation requires restricting heat emission on outer surfaces.

• Industrial Facilities
  Locations with dust accumulation risks (non-explosive) that require luminaires to have controlled surface temperatures and specific ingress protection.

• Public and Institutional Buildings
  To ensure compliance with safety regulations related to fire prevention and thermal safety in lighting systems.

• Lighting Design and Manufacturing
  Guidance for manufacturers to develop luminaires suitable for specialized environments, ensuring safety and regulatory compliance.

Related Standards and References

• IEC 60598-1:2008 - Luminaires Part 1: General requirements and tests.
  The foundational standard for luminaire safety, which IEC 60598-2-24 supplements with particular requirements on limited surface temperatures.

• IEC 60364-4-42 - Low-voltage electrical installations: Protection against thermal effects.
  Provides installation guidelines regarding thermal safety that influence IP rating and luminaire classification.

• ISO 4225:1994 - Air quality vocabulary, including definitions for dust and particulate matter, supporting the classification of dust environments for luminaires.

• IEC 60050-426 - International electrotechnical vocabulary definitions around explosive atmospheres, aiding the exclusion criteria for this standard.

Keywords: IEC 60598-2-24, luminaires limited surface temperature, lighting standards, thermal safety, IP rating, dust protection, electric lighting safety, luminaire testing, IEC standards, non-explosive atmospheres.