PD CLC/TR 60079-33:2015

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Independent verifier
6 Design and construction
7 Application of equipment protection levels (EPL)
8 Preparation of assessment and test specification
9 Ignition hazard assessment
10 Application of special protection 's'
11 Type verification and tests
12 Routine verification and test
13 Documentation
14 Ex components
15 Marking
16 Certificate information
17 Instructions
Annex A (informative) - Explanation of the ignition
        hazard assessment procedure
Annex B (informative) - Examples of ignition hazard
        assessment
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Provides 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 IEC60079 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 IEC60079 applies to electrical equipment employing a method of protection not covered by any existing standard in the IEC60079 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. This part of IEC60079 is not intended for equipment that is covered by the scope of other IEC60079 equipment standards unless it is clearly demonstrated that compliance with the type of protection is not feasible, and additional measures are applied to establish an equivalent equipment protection level. This part of IEC60079 for special protection “s” is applicable to Group I, Group II and Group III and for equipment protection levels Ma, Mb, Ga, Gb, Gc, Da, Db and Dc, as defined in IEC60079‑0 . Certain specific guidance for assessment and testing are provided in the annexes to this standard. This standard supplements and modifies the general requirements of IEC60079‑0 . Where a requirement of this standard conflicts with a requirement of IEC60079‑0 , the requirement of this standard shall take precedence. NOTE1 This standard may be used where equipment requires a higher EPL than the underlying protection techniques provide. Additional control measures or additional design and test requirements would be applied. NOTE2 Parts of equipment that can be designed and tested to standardized techniques should be so designed. Only those parts where conformance with essential safety requirements is achieved through alternative controls should be considered for special protection “s”. Equipment similar in attributes and performance to other equipment within a particular type of protection should be reviewed first to that method of protection prior to being considered for the use of Ex ”s”’. Some parts of IEC60079 allow a degree of variance from the equipment requirements and where determined to be close enough by independent verifiers, then it is preferable to prescribe to the original type of protection.