Sub-System Completion Certificate


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Dublin Institute
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( ESSB )

ETCI TC6 - Potentially Explosive Atmospheres:

Scope/Introduction: || back to top

ET105:2011 National Rules for Electrical Installations in Potentially Explosive Atmospheres 3rd Edition

ETCI TC6 is the national committee responsible for co-ordinating the development of standards for equipment for use where there is a hazard due to the possible presence of explosive atmospheres of gases, vapours, mists or combustible dusts. TC6 members are active participants in the international standards work of IEC TC31, which was established over 60 years ago, and also CENELEC TC31.

IEC and CENELEC standards cover the life cycle of equipment for use in potentially explosive atmospheres through design, manufacture, installation, maintenance and repair.

The area of potentially explosive atmospheres is subject to two EU Directives; Directive 94/9/EC which covers equipment and protective systems and Directive 1999/92/EC which covers the safety and health protection of workers potentially at risk.

ETCI TC6 has prepared the National Rules for Potentially Explosive Atmospheres, ET105:2011. This publication specifies the requirements for electrical installations in potentially explosive atmospheres. This Edition now replaces the Second Edition and has been in place since 3rd January 2012.

ET105:2011 is available for purchase from ETCI Offices. Please visit ETCI's online store.

Reference should also be made to the National Rules for Electrical Installations (ET101:2008) and the associated legal requirements of the Safety, Health and Welfare at Work (General Application) Regulations (S.I.299 of 2007), specifically Parts 3 and 8.

In parallel with the development of ET105:2011, TC6 has also undertaken a complete revision of the Sub-System Completion Certificates and Test Records for Electrical Installations in Potentially Explosive Atmospheres,these are further referenced below.

Please reference ET105:2011 for specific details associated with the testing and documentation requirements for compilation of the Sub-System Completion Certificate for Potentially Explosive Atmospheres. The attachments below are available for free download, however Page 1 of 4 of the Sub-System Completion Certificate must be purchased separately as this identifies the unique certification number.

Sub-System Completion Certificate: || back to top

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ET105 Errata: || back to top


International/European Committees Shadowed (in full or in part): || back to top

CLC/TC31 Electrical apparatus for potentially explosive atmospheres
IEC TC31 Equipment for explosive atmospheres

The hyperlinks in the table above link to the IEC and CENELEC "Dashboards", which provide very detailed information on the relevant committees, their scope, structure, strategic plans, projects, published standards, draft documents, votes and meetings. This content is being continually updated and is the definitive source of information on these committees.

National Projects: || back to top

Title ET105:2011, revision
Scope Design of electrical installations for areas where potentially explosive atmospheres may exist
Committee ETCI TC6 (in consultation with ETCI TC2)
Related international work IEC 60079-14, CENELEC EN 60079-14

Title ET216
Scope Guide to ET105 containing enhanced information on design of installations, selection of equipment, inspection and testing etc
Committee ETCI TC6 (in consultation with ETCI TC2)
Related international work Various IEC, CENELEC and other sources

Useful Links: || back to top

ATEX 137

Useful Tools: || back to top

Frequently Asked Questions: || back to top

Question 1: What is an "EC Type Examination Certificate"?
Question 2: What is 'cold flow' in the context of cables?
Question 3: Is the entry thread classed as part of the flame path when a cable gland is fitted to an Exd enclosure?
Question 4: Does it breach certification if multiple reducers are used on Exe cable glands into a junction box?
Question 5: How should Earth tags be used on/with cable glands/junction boxes in order to ensure correct wiring?
Question 6: Can a flameproof cable gland be used in an increased safety installation?
Question 7: Can an I.P. washer be fitted with an Exd cable gland?
Question 8: What modifications can and can΄t be carried out on Exd enclosures?
Question 9: Why are serrated washers used?
Question 10: What are the restrictions on obstructions near flanges of Exd flameproof enclosures?
Question 11: What does the ‘X' Suffix On an ATEX Certificate number mean?
Question 12: What does the ‘U' Suffix On an ATEX Certificate number mean?
Question 13: What documentation should I receive from a manufacturer/supplier of ATEX equipment?
Question 14: What is the stance on Spare Parts and Repair of Equipment under the ATEX Directive?

Annual Reports: || back to top

Send us a query: || back to top

The ETCI Technical Committee for Potentially Explosive Atmospheres (TC6) value your feedback and would welcome queries and/or suggestions that would best help the Committee develop the needs of the industry and support others with a clear understanding of the requirements associated with the I.S.EN Standards which are strongly supported by the National Rules ET105:2011 3rd Edition.

Your feedback will be held in the strictest of confidentiality.

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Livelink (Members only): || back to top

ETCI TC6 committee documents are hosted on the TC6 Livelink National eCommittees platform. The committee Secretary will have arranged for all members of the committee to have been issued with passwords. In the event of any difficulties, the committee Secretary will normally be able to assist, otherwise the national Livelink Helpdesk may be contacted at


in the area of
Potentially Explosive Atmospheres

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Go to

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Suppliers of

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Industrial Automation
System Integrators

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Newson Gale – Hazardous Static Control

Pepperl & Fuchs - Protecting your Process

Specialist Engineers:

ATEX & SIL Verification

ATEX Verification