Navigating the Transition from IEC 60079-11 Ed.6 to Ed.7

IEC 60079-11 is the international standard that defines the design, construction, and testing requirements for intrinsically safe (IS) equipment intended for use in explosive atmospheres. The publication of Edition 7 (Ed.7) in January 2023 marks a significant update from Edition 6 (Ed.6), with many changes likely to impact IS equipment design and compliance.

Unlike typical revisions that focus on incremental updates, Ed.7 represents a major reworking of the standard. The extensive rewrite makes it difficult to summarize all the technical changes concisely, and as such, careful review and interpretation are essential.

Overview of key changes

Edition 7 includes a foreword table listing 173 changes compared to Edition 6. These changes fall into three broad categories:

• Minor and editorial changes (52 changes): these updates clarify existing requirements, often where Edition 6 was interpreted inconsistently. While not intended to introduce new technical obligations, in practice, some designs that complied with Ed.6 may require updates to meet Ed.7
• Extensions (76 changes): these additions include new or revised requirements that offer alternative compliance options. While not invalidating existing assessments, the new wording may impact the interpretation of prior certifications. A thorough review is recommended to ensure continued compliance
• Major technical changes (45 changes): these are significant updates that elevate the technical expectations of the standard. Changes in this category often require design modifications and additional testing. Key examples include:
• Batteries, cells, and supercapacitors: test requirements have increased. Equipment compliant with Ed.6 will require retesting under Ed.7 protocols
• Encapsulation and conformal coatings: Now subject to routine verification, with stricter requirements for materials
• Catalytic Sensors: prohibited for Group IIC applications under Ed.7, requiring an alternative type of protection for the sensor

Due to these changes, a comprehensive gap analysis is essential to help manufacturers understand the implications for both existing and new products.

Equivalent EN standard

The European version, EN IEC 60079-11:2024, was published in December 2024. However, it is not yet harmonized under the ATEX Directive due to missing annexes. Harmonization is currently expected by December 2025.

Until then, compliance with EN 60079-11:2012 remains valid. However, this version is expected to be de-harmonized by December 2027, after which only equipment certified to the new edition will be considered compliant for ATEX.

How we can support your transition

We offer deep expertise and practical guidance to help you navigate this complex transition. Here's how we can support you:

• Gap analysis and design impact assessment: our technical experts conduct a detailed comparison of your current products against Ed.7 requirements, identifying any areas that need redesign, retesting or re-evaluation
• Testing and certification to Ed.7: we provide accredited laboratory testing for compliance with Ed.7, including the updated protocols for batteries, encapsulation and other critical elements. Our efficient testing processes help you stay on schedule
• Update of existing certificates: we assist in updating your existing certification documentation, ensuring smooth continuation of market access while maintaining compliance with evolving standards
• Strategic compliance planning: we work with your product and compliance teams to develop a transition strategy that aligns with your product lifecycle, supply chain constraints and certification deadlines
• ATEX and IECEx dual compliance support: our certification services cover both IECEx and ATEX, ensuring a harmonized approach across multiple regulatory regimes as the EN version progresses toward harmonization

The transition from IEC 60079-11 Edition 6 to Edition 7 introduces significant changes that may affect the design, testing and certification of intrinsically safe equipment. We are your trusted partner during this transition, offering tailored support to maintain your compliance, reduce business risk and get your products to market with confidence.

To find out more about the services we offer, visit our web page >

Or alternatively, please contact:

Tom Engle
Business Development Manager
Consumer Products and Retail
t: +44 (0)151 350 6666