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Název	Explosive atmospheres – Part 13: Equipment protection by pressurized room "p" and artificially ventilated room "v"
Číslo	31J/416/CDV - IEC 60079-13 ED3
Zdroj	ISO\IEC\CEN\CENELEC
Komise	IEC/SC 31J (Classification of hazardous areas and installation requirements)
Zkontrolujte datum zahájení	09.06.2026
K připomínkám do	07.07.2026
Oblast zaměření	Prostředí s nebezpečím výbuchu. Prevence a ochrana proti výbuchu

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Anotace

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

a) located in a Zone 1 or Zone 2, or Zone 21 or Zone 22 (an area normally requiring an Equipment Protection Level (EPL) Gb, Gc, Db or Dc) without an internal source of gas or vapour release and protected by pressurization;

b) located in a Zone 1 or Zone 2, or Zone 21 or Zone 22 (an area normally requiring EPL Gb, Gc, Db or Dc), containing an internal source of gas or vapour release and protected by both pressurization and artificial ventilation;

c) located in a Zone 2 (an area normally requiring EPL Gc) with or without an internal source of gas or vapour release and protected by artificial ventilation; or

d) located in a non-hazardous area, containing an internal source of gas or vapour release and protected by artificial ventilation.

Equipment with a minimum EPL of Gc permitted in a room located in a Zone 1 (EPL Gb) or Dc permitted in a room located in a Zone 21 (EPL Db) is not addressed in this document as it is considered not practical in the context of rooms and the equipment that might be required.

NOTE 1 Internal releases of combustible dust are not considered as neither protection by ventilation nor protection by pressurization can prevent hazardous areas from such releases.

NOTE 2 See Annex C for examples of applications.

The term "room" used in this document includes single rooms, multiple rooms, a complete building, or a room contained within a building, and includes associated ventilation duct work. A room is intended to facilitate the entry of personnel. Regions of the "room" where the protection is provided by local ventilation, for example ventilation hoods, can also be considered in the evaluation of the "room".

Enclosures designed to permit personnel to completely enter can also be considered as a room, for example a large acoustic enclosure.

Limitations in the use of protection by ventilation are specified in 7.1.1.

This document is not intended to apply to temporary structures, for example, to enable hot work to be completed in an operating plant.

NOTE 3 Despite the above intent for permanent structures, elements of this document are commonly used as guidance for temporary structures.

This document also includes requirements for 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 land-based 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 performed on site.

This document does not specify the methods that might be required to ensure adequate air quality for personnel such as asphyxiation, toxicity and temperature hazards within the room. Additional guidance on analyser houses, asphyxiation and toxicity hazards can be found in IEC 61285. National or other regulations and requirements might also exist for the safety of personnel.

The scope does not include:

a) Protection of rooms by using an inert gas or a flammable gas.

NOTE: It is recognized that such applications are special cases but are likely to be the subject of additional, stringent engineering standards, procedures and practices.

b) Pressurized enclosures for equipment that are not intended to facilitate the entry of personnel.

NOTE: Such enclosures are addressed in IEC 60079-2.

This document supplements and modifies the general requirements of IEC 60079-0, except 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 – Applicability of specific clauses of IEC 60079-0

Clause of IEC 60079-0		IEC 60079-0 application to IEC 60079-13
Ed. 8.0 (2026) (informative)	Clause / Subclause title (normative)	IEC 60079-0 application to IEC 60079-13
4	Equipment grouping
4.1	General	Applies
4.2	Group I	Excluded
4.3	Group II	Applies
4.4	Group III	Applies
4.5	Equipment for a particular explosive atmosphere	Applies
5	Temperatures
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	Limitation of maximum surface temperature	Applies
5.3.3	Small component temperature for Group I or Group II electrical equipment	Excluded
5.3.4	Component temperatures of smooth surfaces for Group I or Group II electrical equipment	Excluded
6	Requirements for all equipment
6.1	General	Applies
6.2	Mechanical strength of equipment	Excluded
6.3	Opening times	Excluded
6.4	Circulating currents in enclosures	Excluded
6.5	Gasket retention	Excluded
6.6	Electromagnetic and ultrasonic radiating equipment	Applies
6.6.1	General	Applies
6.6.2	Radio frequency sources	Applies
6.6.3	Ultrasonic sources	Applies
6.6.4	Lasers, luminaires, and other non-divergent continuous wave optical sources	Applies
7	Non-metallic enclosures and non-metallic parts of enclosures	Excluded
8	Metallic enclosures and metallic parts of enclosures	Excluded
9	Fasteners	Excluded
10	Interlocking devices	Excluded
11	Bushings	Excluded
12	(Reserved for future use)	Excluded
13	Ex Components	Excluded
14	Connection facilities	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	Reserved for future use	Excluded
20	Supplementary requirements for external plugs, socket outlets and connectors for field wiring connection	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	Type tests
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 UV light	Excluded
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
28.1	Conformity with the documentation	Applies
28.2	Certificate	Applies
28.3	Responsibility for marking	Applies
29	Marking
29.1	Applicability	Applies
29.2	Location	Applies
29.3	General	Applies
29.4	Ex marking for explosive gas atmospheres	Applies
29.5	Ex marking for explosive dust atmospheres	Applies
29.6	Combined types of protection	Applies
29.7	Multiple types of protection	Applies
29.8	Ga using two independent Gb types (or levels) of protection	Excluded
29.9	Boundary wall	Excluded
29.10	Ex Components	Excluded
30	Instructions	Modified
Annex A	Supplementary requirements for cable glands	Excluded
Applies: This Clause/Subclause of IEC 60079-0 is applied without change. Excluded: This Clause/Subclause of IEC 60079-0 does not apply. Modified: This Clause/Subclause 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 60079-0:2017.

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