This part of IEC 60079 gives requirements for the design, construction, assessment and
testing and marking of rooms protected by pressurization in:
• a room located in an explosive gas atmosphere or explosive dust atmosphere
hazardous area that does not include an internal source of a flammable substance;
• a room located in an explosive gas atmosphere or explosive dust atmosphere
hazardous area that includes an internal source of a flammable substance;
• a room located in a non-hazardous area that includes an internal source of a
flammable substance.
NOTE If ventilation is used and pressurization is not used, then this part of IEC 60079 does not apply. The
situation is covered by the requirements of IEC 60079-10-1.
A room may be a single room, multiple rooms, a complete building or a room contained within
a building and includes inlet and outlet ducts. This part of IEC 60079 also includes
requirements for associated equipment, safety devices and controls necessary to ensure that
pressurization is established and maintained.
This part of IEC 60079 covers rooms or buildings that are constructed or assembled on site,
which may be either on land or off-shore, designed to facilitate the entry of personnel and
primarily intended for installation by an end-user and verification on site. The room may be
located in an explosive gas atmosphere or a explosive dust atmosphere requiring equipment
protection levels (EPL) Gb, Db, Gc or Dc.
This part of IEC 60079 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.
NOTE 1 Whilst the scope of this part of IEC 60079 does not address toxicity it is vital that proper consideration is
given to this aspect to ensure the safety of personnel. National regulations and requirements should be observed
in this regard.
NOTE 2 There is a related standard IEC60079-2 (Equipment protection by pressurized enclosure) covering the
different conditions encountered when using the pressurization technique.
NOTE 3 Maintenance needs are contained in Annex B until they are included IEC 60079-17.
NOTE 4 For the purposes of this part of IEC 60079, the terms "lower flammable limit (LFL)" and "lower explosive
limit (LEL)" are deemed to be synonymous, and likewise the terms "upper flammable limit (UFL)" and "upper
explosive limit (UEL)" are deemed to be synonymous. For ease of reference, the two abbreviations LFL and UFL
may be used hereinafter to denote these two sets of terms. It should be recognized that particular authorities
having jurisdiction may have overriding requirements that dictate the use of one of these sets of terms and not the
other.
This part of IEC 60079 supplements and modifies the general requirements of IEC 60079-0,
except as indicated in Table 1. Where a requirement of this standard conflicts with a
requirement of IEC 60079-0, the requirement of this standard takes precedence.
IEC 60079-13:2010 Referenced Document
IEC 60079-0 Interpretation Sheet 2 - Explosive atmospheres - Part 0: Equipment - General requirements*， 2019-06-27 Update