IEC 60079-33:2012

Explosive atmospheres - Part 33: Equipment protection by special protection 's'

IEC 60079-33:2012 gives the specific methodology for the assessment and testing, and requirements for marking of electrical equipment, parts of electrical equipment and Ex components with special protection "s". This part of IEC 60079 applies to electrical equipment employing a method of protection not covered by any existing standard in the IEC 60079 series, electrical equipment employing one or more recognized types of protection where the design and construction is not fully compliant with the standard for the type of protection, electrical equipment where the intended use is outside the parameters of the scope of the standard for the type of protection. Key words: requirements for marking of electrical equipment, Ex components with special protection "s".

Atmosphères explosives - Partie 33: Protection du matériel par mode de protection spéciale "s"

La CEI 60079-33:2012 donne la méthodologie spécifique relative à l'évaluation et aux essais, ainsi que les exigences de marquage des matériels électriques, des parties de ceux-ci et des composants Ex dotés de la protection spéciale "s". La présente partie de la CEI 60079 s'applique aux matériels électriques utilisant une méthode de protection non couverte par une norme existante, quelle qu'elle soit, dans la série CEI 60079, matériels électriques utilisant un ou plusieurs modes de protection reconnus, pour lesquels la conception et la construction ne sont pas complètement conformes à la norme couvrant le mode de protection, aux matériels dont l'utilisation prévue est hors des paramètres du domaine d'application de la norme couvrant le mode de protection. Mots Clés: exigences de marquage des matériels électriques, composants Ex dotés de la protection spéciale "s".

General Information

• Status: Published
• Publication Date: 26-Sep-2012
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: TC 31 - Equipment for explosive atmospheres
• Drafting Committee: PT 60079-33 - TC 31/PT 60079-33
• Current Stage: PPUB - Publication issued
• Start Date: 30-Sep-2012
• Completion Date: 27-Sep-2012

Standards Content (Sample)

IEC 60079-33 ®
Edition 1.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 33: Equipment protection by special protection “s”

Atmosphères explosives –
Partie 33: Protection du matériel par protection spéciale "s"

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IEC 60079-33 ®
Edition 1.0 2012-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 33: Equipment protection by special protection “s”

Atmosphères explosives –
Partie 33: Protection du matériel par protection spéciale "s"

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX W
ICS 29.260.20 ISBN 978-2-83220-359-0

– 2 – 60079-33 © IEC:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 General . 11
4.1 Application . 11
4.2 Equipment group and temperature classification . 11
4.3 Level of protection (equipment protection level (EPL)) . 11
4.4 Manufacturer’s justification . 12
4.5 Verification . 12
5 Independent verifier . 12
5.1 General . 12
5.2 Competence . 12
5.3 Duties. 13
5.4 Acceptance . 13
5.5 Independence. 13
6 Design and construction . 13
6.1 Principles of an integrated approach to explosion safety . 13
6.2 Design and construction . 14
6.3 Overloading of equipment . 14
6.4 Potential ignition sources . 14
6.4.1 Hazards arising from different ignition sources . 14
6.4.2 Hazards arising from overheating . 14
6.4.3 Hazards arising from pressure compensation operations . 14
6.5 Requirements in respect of safety-related devices . 14
7 Application of equipment protection levels (EPL) . 15
7.1 Equipment with EPL Ma . 15
7.2 Equipment with EPL Mb . 15
7.3 Equipment with EPL Ga . 16
7.4 Equipment with EPL Gb . 17
7.5 Equipment with EPL Gc . 17
7.6 Equipment with EPL Da . 17
7.7 Equipment with EPL Db . 18
7.8 Equipment with EPL Dc . 18
8 Preparation of assessment and test specification . 18
8.1 General . 18
8.2 Assessment and test specification . 19
8.3 Assessment and testing. 19
8.4 Reporting results of the assessment and test specification . 19
9 Ignition hazard assessment . 19
9.1 General . 19
9.2 Protective measures . 19
9.3 Explanation of the ignition hazard assessment procedure . 20
9.4 Examples of ignition hazard assessment . 20
10 Application of special protection “s” . 20

60079-33 © IEC:2012 – 3 –
10.1 General . 20
10.2 Justification for the application of special protection “s” . 20
10.2.1 Application . 20
10.2.2 Equipment substantially meeting the requirements for the recognized
types of protection . 21
10.2.3 Equipment outside the scope of recognized types of protection . 21
10.2.4 Protection technique with no alignment to the recognized types of
protection . 21
10.2.5 Enhanced EPL through additional means of protection . 22
10.2.6 Combination of approaches . 22
10.3 Adaption of recognized types of protection . 22
10.4 Other innovative means of ensuring safety . 22
10.5 Connection of conductor and cables . 22
11 Type verification and tests . 23
11.1 General . 23
11.2 Temperature measurement test . 23
12 Routine verification and test . 23
13 Documentation . 23
14 Ex components . 23
15 Marking . 23
15.1 General . 23
15.2 Marking for Ex “s” only . 23
15.3 Marking for Ex “s” with other recognized types of protection . 23
16 Certificate information . 24
16.1 Certificate for Ex “s” only . 24
16.2 Certificate for Ex “s” with other recognized types of protection . 24
16.3 Specific conditions of use . 24
16.4 Schedule of limitations . 24
17 Instructions . 24
Annex A (informative) Explanation of the ignition hazard assessment procedure. 25
Annex B (informative) Examples of ignition hazard assessment . 31
Bibliography .
...