BS EN 60079-13:2017 - Page 2

Explosive atmospheres. Equipment protection by pressurized room "p" and artificially ventilated room "v" | Status: Current, Work in hand

1 Scope This part of IEC 60079 gives requirements for the design, construction, assessment, verification and marking of rooms used to protect internal equipment:

• — located in a Zone 1 or Zone 2 or Zone 21 or Zone 22 explosive atmosphere (an area normally requiring an equipment protection level (EPL) Gb, Gc, Db or Dc) without an internal source of gas/vapour release and protected by pressurization;
• — located in a Zone 2 explosive atmosphere (an area normally requiring EPL Gc) with or without an internal source of gas/vapour release and protected by artificial ventilation;
• — located in a non-hazardous area, containing an internal source of gas/vapour release and protected by artificial ventilation;
• — located in a Zone 1 or Zone 2 or Zone 21 or Zone 22 explosive atmosphere (an area normally requiring EPL Gb, Gc, Db or Dc), containing an internal source of gas/vapour release and protected by both pressurization and artificial ventilation.

The term "room" used in this document includes single rooms, multiple rooms, a complete building or a room contained within a building. A room is intended to facilitate the entry of personnel and includes inlet and outlet ducts. An acoustic hood and other like enclosures designed to permit the entry of personnel can be considered as a room. This document also includes requirements related safety devices and controls necessary to ensure that artificial ventilation, purging and pressurization is established and maintained. A room assembled or constructed on site, can be either on land or off-shore. The room is primarily intended for installation by an end-user but could be constructed and assessed at a manufacturer’s facility, where the final construction such as ducting can be completed on site. Rooms can be located in an explosive gas atmosphere requiring EPL Gb or Gc, or a combustible dust atmosphere requiring EPL Db, or Dc. This document does not specify the methods that may be required to ensure adequate air quality for personnel with regard to toxicity and temperature within the room. National or other regulations and requirements may exist to ensure the safety of personnel in this regard. Protection of rooms by using an inert gas or a flammable gas is outside of the scope of this document. It is recognized that such applications are special cases, which in part may be addressed using the principles from IEC 60079‑2, but in all probability will also be the subject of additional, stringent engineering standards, procedures and practices. Pressurized enclosures for equipment that are not intended to facilitate the entry of personnel are addressed in IEC 60079‑2, and are not in the scope of this document.

NOTE Maintenance recommendations are contained in Annex A until they can be included in IEC 60079‑17.

This document supplements and modifies the general requirements of IEC 60079‑0, except exclusions as indicated in Table 1. Where a requirement of this document conflicts with a requirement of IEC 60079‑0, the requirement of this document takes precedence. Table 1 — Exclusion of specific clauses or subclauses of IEC 60079‑0 Clause of IEC 60079‑0 IEC 60079‑0 application to IEC 60079‑13 Ed. 6.0 (2011) (Informative) Clause / subclause title (Normative) 4 Equipment grouping Applies 4.1 Group I Excluded 4.2 Group II Applies 4.3 Group III Applies 4.4 Equipment for a particular explosive atmosphere Applies 5.1 Environmental influences Applies 5.1.1 Ambient temperature Applies 5.1.2 External source of heating or cooling Applies 5.2 Service temperature Applies 5.3.1 Determination of maximum surface temperature Applies 5.3.2.1 Group I electrical equipment Excluded 5.3.2.2 Group II electrical equipment Applies 5.3.2.3 Group III electrical equipment Applies 5.3.3 Small component temperature for Group I and Group II electrical equipment Excluded 6.1 General Applies 6.2 Mechanical strength Excluded 6.3 Opening times Excluded 6.4 Circulating currents Excluded 6.5 Gasket retention Excluded 6.6 Electromagnetic and ultrasonic radiating equipment Applies 7.1 General Excluded 7.2 Thermal endurance Excluded 7.3 Resistance to light Modified 7.4 Electrostatic charges on external non-metallic materials Excluded 7.5 Accessible metal parts Excluded 8 Metallic enclosures and metallic parts of enclosures Excluded 9 Fasteners Excluded 10 Interlocking devices Excluded 11 Bushings Excluded 12 Materials used for cementing Excluded 13 Ex components Excluded 14 Connection facilities and termination compartments Excluded 15 Connection facilities for earthing and bonding conductors Excluded 16 Entries into enclosures Excluded 17 Supplementary requirements for rotating electrical machines Excluded 18 Supplementary requirements for switchgear Excluded 19 Supplementary requirements for fuses Excluded 20 Supplementary requirements for plugs and sockets Excluded 21 Supplementary requirements for luminaires Excluded 22 Supplementary requirements for caplights and handlights Excluded 23 Equipment incorporating cells and batteries Excluded 24 Documentation Applies 25 Compliance of prototype or sample with documents Applies 26.1 General Applies 26.2 Test configuration Applies 26.3 Tests in explosive test mixtures Excluded 26.4 Tests of enclosures Excluded 26.5 Thermal tests Excluded 26.6 Torque test for bushings Excluded 26.7 Non-metallic enclosures or non-metallic parts of enclosures Excluded 26.8 Thermal endurance to heat Excluded 26.9 Thermal endurance to cold Excluded 26.10 Resistance to light Applies 26.11 Resistance to chemical agents for Group I electrical equipment Excluded 26.12 Earth continuity Excluded 26.13 Surface resistance test of parts of enclosures of non-metallic materials Excluded 26.14 Measurement of capacitance Excluded 26.15 Verification of ratings of ventilating fans Excluded 26.16 Alternative qualification of elastomeric sealing O-rings Excluded 27 Routine tests Applies 28 Manufacturers responsibility Applies 29.1 Applicability Applies 29.2 Location Modified 29.3 General Modified 29.4 Ex marking for explosive gas atmospheres Modified 29.5 Ex marking for explosive dust atmospheres Applies 29.6 Combined types of protection Applies 29.7 Multiple types of protection Excluded 29.8 Ga using two independent Gb types of protection Excluded 29.9 Ex components Excluded 29.10 Small equipment and small Ex components Excluded 29.11 Extremely small equipment and extremely small Ex components Modified 29.12 Warning markings Applies 29.13 Alternate marking of equipment protection levels (EPLs) Excluded 29.14 Cells and batteries Applies 30 Instructions Modified Annex A Supplementary requirements for Ex cable glands Excluded Annex B Requirements for Ex components Excluded Annex C Example of rig for resistance to impact test Excluded Annex D Introduction to an alternative risk assessment method encompassing "equipment protection levels" for Ex equipment Applies Applies: this requirement of IEC 60079‑0 is applied without change. Excluded: this requirement of IEC 60079‑0 does not apply. Modified: this requirement of IEC 60079‑0 is modified as detailed in this document.

NOTE The applicable requirements of IEC 60079‑0 are identified by the clause title which is normative. This table was written against the specific requirements of IEC 60079‑0, Ed 6.0.