IEC 60695-1-21:2016

Overview

IEC 60695-1-21:2016 is an international standard published by the International Electrotechnical Commission (IEC) that provides comprehensive guidance on assessing the ignitability of electrotechnical products and their constituent materials. As part of the IEC 60695 series on fire hazard testing, this standard summarizes relevant test methods used worldwide to evaluate the likelihood that electrical and electronic equipment will ignite and potentially cause a fire hazard. It represents the current state of the art, reflecting technical revisions from its previous technical report edition in 2008.

The standard serves primarily technical committees preparing IEC and ISO/IEC standards rather than manufacturers or certification bodies. It offers critical insight into the selection and applicability of ignitability test methods for fire hazard assessment within the electrotechnical sector.

Key Topics

• Ignitability Assessment: Focuses on the resistance of electrotechnical products to ignition, a fundamental parameter in fire hazard evaluation. Since ignition is the initial stage of fire, assessing ignitability effectively helps prevent fire-related risks.

• Test Method Summaries: Details a variety of test methods classified by heat source, including:

  • Heated air or electrical heating tests (e.g., hot-air furnace, differential scanning calorimetry)
  • Radiant heat exposure tests (e.g., cone calorimeter, heat flux determination)
  • Oxygen index tests under ambient and elevated temperatures to determine flammability ranges
  • Glow wire and hot wire coil ignitability tests to simulate electrical heating sources
  • Flame tests using needle flames or standard flame sources for vertical and horizontal orientations
  • Electrical arc-based testing methods assessing ignition caused by arcs, such as tracking index tests

• Technical Revisions: The 2016 edition transitions from a technical report (TR) to a full international standard, with updated normative references, expanded terms and definitions, and integration of ASTM D 3638 test methods addressing electrical arc ignition.

• Factors Influencing Ignitability: The standard highlights multiple variables influencing ignition risk, including test specimen geometry, material composition, heat flux magnitude and position, airflow, and ignition source characteristics.

Applications

IEC 60695-1-21:2016 is essential for technical committees and standards developers focusing on fire safety in the design, testing, and regulation of electrical and electronic products. Key practical uses include:

• Standards Development: Guiding the creation of robust fire safety standards tailored to assess ignitability effectively for various electrotechnical components and assemblies.

• Fire Hazard Engineering: Facilitating fire safety engineers in understanding and selecting appropriate ignitability test methods to evaluate risk during product design and development phases.

• Risk Reduction: Supporting manufacturers indirectly through technical committee guidance to choose materials and designs that reduce ignition risk, thus lowering fire hazards in real-world applications.

• Test Method Selection: Providing authoritative direction on the relevance and limitations of different ignitability tests, enabling informed decisions about assessment protocols corresponding to specific product types and operational conditions.

Related Standards

IEC 60695-1-21:2016 is part of the broader IEC 60695 series on fire hazard testing, including but not limited to:

• IEC 60695-1-10: General guidelines for fire hazard assessment of electrotechnical products
• IEC 60695-1-11: Fire hazard assessment methodologies
• IEC 60695-1-12: Fire safety engineering principles for electrotechnical product design
• IEC 60695-1-20: General guidance on ignitability assessment
• IEC 60695-2: Glow wire test series addressing electrical ignition sources
• IEC 60112: Test methods for electrical tracking resistance related to ignition

The standard also references internationally recognized test methods from ISO (e.g., ISO 871, ISO 5660) and ASTM (e.g., ASTM E1321, ASTM D 3638) to ensure comprehensive coverage of ignitability testing techniques.

Keywords: IEC 60695-1-21, fire hazard testing, ignitability, electrotechnical products, electrical fire safety, fire safety engineering, ignition resistance, test methods, electrical ignition, fire hazard standards, IEC fire testing