Products installed and operated in Explosive Atmospheres (Hazardous Locations Testing & Certification) are required to comply with the ATEX Directive, but may also need to comply with other applicable EU Directives, such as the EMC Directive, Low voltage Directive, R&TTE Directive and/or others, depending on the product application.
Products complying with the Essential Health and Safety Requirements (EHSR) of the ATEX Directive are marked with the “EX” mark. Products classified “Category 1 or 2” must be issued an “EC Type- Examination Certificate” by a Notified Body. Products classified “Category 3” can be “Self-Declared”.
Products required to comply with the ATEX Directive are evaluated to the EN 60079 series of standards, which have been adopted from the IEC 60079 series of standards. Applicable EN standards may include national deviations for ATEX marking and therefore, additional testing to address the deviations may be needed.
|Level of Protection||Category Group 1||Category Group 2||Performance of Protection||Conditions of Operation*|
|Very High||M 1||Two independent means of protection of safe even when two faults occur independently of each other||Equipment remains energised and functioning when explosive atmosphere present|
|Very High||1||Two independent means of protection of safe even when two faults occur independently of each other||Equipment remains energised and functioning in Zones 0, 1, 2 (G) and/or 20, 21, 22 (D)|
|High||M 2||Suitable for normal operation and severe operating conditions. If applicable also suitable for frequently occurring disturbances or for faults which are normally taken into account||Equipment de-energised when explosive atmosphere is recognized|
|High||2||Suitable for normal operation and frequently occurring disturbances or equipment where faults are normally taken into account||Equipment remains energized and functioning in Zones 1, 2 (G) and/or 21, 22 (D)|
|Normal||3||Suitable for normal operation||Equipment remains energised and functioning in Zone 2 (G) and/or 22 (D)|
The ATEX Directive consists of 3 key elements:
- ATEX EU Type Exam Certificate, which documents the evaluation and testing of the subject equipment performed to the applicable EN 60079 standards. The certificate is issued by a Notified Body (NB);
- ATEX Quality Assessment Notification (QAN), similar to the QAR (Quality Assessment Report) as per IECEx Scheme, which documents the suitability of the manufacturer’s implementation of the requirements of EN ISO/IEC 80079-34 Explosive atmospheres – Part 34: Application of quality systems for equipment manufacture. This audit is performed by a LabTest Auditor, at the manufacturer location. Length and frequency of both initial and Surveillance (Follow-Up) audits vary depending on the existence of a quality management system based on ISO9000:2008 (certified by a third party) or not. The notification is issued by a Notified Body (NB);
- Declaration of Conformity (DoC), stating compliance with all applicable Directives. The DoC is issued by the manufacturer for Zone 2 certifications. For “Zone 1” or “Zone 0”, an EU-Type Examination Certificate is needed. Such certificate is issued by a Notified Body (NB).
* Only Category 3 Equipment can be Self-Declared for compliance to the ATEX directive *