BS EN 60079-2:2014

INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Protection levels
5 Constructional requirements for pressurized
   enclosures
6 Temperature limits
7 Safety provisions and safety devices (except for
   static pressurization)
8 Safety provisions and safety devices for static
   pressurization
9 Supply of protective gas
10 Pressurized equipment with an internal
   source of release
11 Release conditions
12 Design requirements for the containment system
13 Protective gas and pressurizing techniques
   when there is an internal source of release
14 Ignition-capable equipment
15 Internal hot surfaces
16 Type verification and tests
17 Routine tests
18 Marking
19 Instructions
Annex A (normative) Purging and dilution tests
Annex B (informative) Examples of functional
        sequence diagram
Annex C (informative) Examples of the changes in
        pressure in ducts and enclosures
Annex D (informative) Information to be provided
        to the user
Annex E (normative) Classification of the type of
        release within enclosures
Annex F (informative) Examples for the use of the
        dilution area concept
Annex G (normative) Internal Cells and Batteries for
        Level of Protection 'pxb' and
        Level of Protection 'pyb'
Annex H (normative) Internal Cells and Batteries
        for Level of Protection 'pzc'
Bibliography
Annex ZA (normative) - Normative references to
         international publications with
         their corresponding European
         publications
Annex ZZ (informative) - Coverage of Essential
         Requirements of EU Directives
Annex ZY (informative) - Significant changes
         between this European Standard
         and EN 60079-2:2007

Defines the specific requirements for the construction and testing of electrical equipment with pressurized enclosures, of type of protection 'p', intended for use in explosive gas atmospheres or explosive dust atmospheres.

This part of IEC60079 contains the specific requirements for the construction and testing of electrical equipment with pressurized enclosures, of type of protection “p??, intended for use in explosive gas atmospheres or explosive dust atmospheres. It also includes the requirements for pressurized enclosures containing a limited release of a flammable substance. 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 requirements of this standard take precedence. This standard does not include the requirements for: pressurized enclosures where the containment system may release air with an oxygen content greater than normal, or oxygen in combination with inert gas where the oxygen is in a proportion greater than 21%. pressurized rooms or analyser houses; see IEC60079-13; pressurized enclosures used where “explosives?? or pyrotechnics are present; pressurized enclosures used where hybrid mixtures of gas/vapour and combustible dust are present; pressurized enclosures used where pyrophoric substances such as explosives or propellants containing their own oxidizers are present pressurized enclosures with an internal source of release of combustible dust. NOTE When the user acts in the role of the manufacturer, it is typically the user’s responsibility to ensure that all relevant parts of this standard are applied to the manufacturing and testing of the equipment.