SIST EN 60079-14:2014

Explosive atmospheres - Part 14: Electrical installations design, selection and erection (IEC 60079-14:2013)

IEC 60079-14:2013 contains the specific requirements for the design, selection, erection and initial inspection of electrical installations in, or associated  with, explosive atmospheres. Where the equipment is required to meet other environmental conditions, for example, protection against ingress of water and resistance to corrosion, additional protection requirements may be necessary. The requirements of this standard apply only to the use of equipment under standard atmospheric conditions as defined in IEC 60079-0. For other conditions, additional precautions may be necessary, and the equipment should be certified for these other conditions. For example, most flammable materials and many materials which are normally regarded as non-flammable might burn vigorously under conditions of oxygen enrichment. These requirements are in addition to the requirements for installations in non-hazardous areas. This standard applies to all electrical equipment including fixed, portable, transportable and personal, and installations, permanent or temporary. No account is taken in this Standard of the toxic risks that are associated with flammable gases, liquids and dusts in concentrations that are usually very much less than the lower explosive limit. In locations where personnel may be exposed to potentially toxic concentrations of flammable material, appropriate precautions should be taken. Such precautions are outside the scope of this Standard. This fifth edition cancels and replaces the fourth edition published in 2007. This edition constitutes a technical revision. Refer to the document's Foreward for a listing of the specific revisions and additional Notes. Key words: requirements for the design, selection, erection and initial inspection of electrical installations in explosive atmospheres

Explosionsgefährdete Bereiche - Teil 14: Projektierung, Auswahl und Errichtung elektrischer Anlagen (IEC 60079-14:2013)

Atmosphères explosives - Partie 14: Conception, sélection et construction des installations électriques (IEC 60079-14:2013)

L'IEC 60079-14:2013 contient les exigences spécifiques de conception, de sélection, de construction et d'inspection initiale applicables aux installations électriques situées ou en relation avec des atmosphères explosives. Lorsque le matériel est tenu de satisfaire à d'autres conditions environnementales, par exemple, la protection contre la pénétration de l'eau et la résistance à la corrosion, des exigences de protection supplémentaires peuvent être nécessaires. Les exigences de la présente norme s'appliquent uniquement à l'utilisation de matériels dans des conditions atmosphériques normalisées telles que définies dans la CEI 60079-0. Pour d'autres conditions, des précautions complémentaires peuvent être nécessaires, et il convient de certifier le matériel pour ces mêmes conditions. Par exemple, la plupart des matières inflammables et beaucoup de matières normalement réputées ininflammables sont susceptibles de brûler violemment dans des conditions enrichies en oxygène. Ces exigences complètent celles relatives aux installations dans les emplacements non dangereux. La présente norme est applicable à tout matériel électrique fixe, portable, transportable et personnel et aux installations permanentes ou temporaires. La présente norme ne tient pas compte des risques toxiques associés aux gaz, liquides et poussières inflammables présents dans des concentrations habituellement bien inférieures à la limite inférieure d'explosivité. Sur les sites où le personnel peut être exposé à des concentrations potentiellement toxiques de matières inflammables, il convient de prendre des précautions appropriées. Ces précautions ne relèvent pas du domaine d'application de la présente norme. Cette cinquième édition annule et remplace la quatrième édition parue en 2007, dont elle constitue une révision technique. Reportez-vous à l'Avant-propos du document pour obtenir une liste des révisions spécifiques et billets supplémentaires. Mots clès: exigences de conception, de sélection, de construction et d'inspection initiale applicables aux installations électriques situées ou en des atmosphères explosives

Eksplozivne atmosfere - 14. del: Načrtovanje, izbira in namestitev električnih inštalacij (IEC 60079-14:2013)

Standard EN IEC 60079-14 vsebuje posebne zahteve za načrtovanje, izbiro, namestitev in začetni pregled električnih inštalacij v eksplozivnih atmosferah ali v povezavi z njimi. Kadar je potrebna oprema za izpolnjevanje drugih okoljskih razmer, na primer zaščita pred vdorom vode in odpornost proti koroziji, so morda potrebne dodatne zahteve. Zahteve tega standarda se nanašajo samo na uporabo opreme v standardnih atmosferskih pogojih, kot so opredeljeni v standardu IEC 60079-0. Za druge pogoje so morda potrebni dodatni varnostni ukrepi. Oprema naj bi bila certificirana za te pogoje. Na primer večina vnetljivih materialov in številni materiali, ki se običajno obravnavajo kot nevnetljivi, močno gorijo ob dodajanju kisika. Te zahteve so dodatne k zahtevam za inštalacije v nenevarnih območjih. Ta standard velja za vso električno opremo, vključno s fiksno, prenosno, premično in osebno, ter stalne ali začasne inštalacije. Ta standard ne velja za - električne inštalacije v rudnikih, ki so občutljive na eksplozivni jamski plin. V tem standardu niso zajete nevarnosti zastrupitve, ki so povezane z vnetljivimi plini, tekočinami in prahom v koncentracijah, ki so običajno precej pod spodnjo mejo eksplozivnosti. Na mestih, kjer je osebje lahko izpostavljeno morebitnim toksičnim koncentracijam vnetljivega materiala, naj bi upoštevali ustrezne previdnostne ukrepe. Ti ukrepi niso zajeti v tem standardu.

General Information

• Status: Published
• Publication Date: 19-Aug-2014
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: EXP - Product for explosive atmospheres
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-May-2014
• Due Date: 10-Jul-2014
• Completion Date: 20-Aug-2014
• Directive: 2016-01-1803 - Pravilnik o protieksplozijski zaščiti
• Directive: TRRTP131 - Tehnična smernica TSG-N-002:2009 - Nizkonapetostne električne inštalacije
• Ref Project: EN 60079-14:2014 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection

Relations

• Replaces: SIST EN 60079-14:2009 - Explosive atmospheres -- Part 14: Electrical installations design, selection and erection
• Effective Date: 01-Sep-2016
• Replaces: SIST EN 60079-14:2009/AC:2011 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection
• Effective Date: 01-Sep-2016
• Corrected By: SIST EN 60079-14:2014/AC:2016 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection
• Effective Date: 09-Feb-2016
• Revised: SIST EN IEC 60079-14:2025 - Explosive atmospheres - Part 14: Electrical installation design, selection and installation of equipment, including initial inspection (IEC 60079-14:2024)
• Effective Date: 24-Dec-2019

Overview

EN 60079-14:2014 (CLC adoption of IEC 60079-14:2013) is the European standard that defines requirements for the design, selection, erection and initial inspection of electrical installations in explosive atmospheres. It applies to fixed, portable, transportable and personal electrical equipment and covers installations that are permanent or temporary. The standard is intended for use under the standard atmospheric conditions defined in IEC 60079-0; other environmental conditions may require additional certification or precautions. It does not address toxic risks from flammable materials.

Key topics and technical requirements

• Hazard classification and area zoning: guidance for locating and classifying gas and dust hazardous areas in support of equipment selection.
• Equipment selection: criteria for choosing protection concepts (Ex d, Ex e, Ex i, Ex nR, Ex t, etc.) and new selection rules for specific technologies such as radiating equipment, ultrasonic equipment, RFID tags, cells and batteries, gas detectors and rotating electrical machines.
• Installation practices: detailed requirements for cabling, cable entry systems, cable glands, earthing, bonding, and material composition of installation components (including light metals).
• Terminations and terminal boxes: limits on power dissipation, IP ratings, mechanical integrity and requirements where intrinsically safe circuits are present.
• Electrical heating and trace heating: structure for design and monitoring, plus an annex on trace heating installations.
• Static electricity and electromagnetic radiation: new structure aligning requirements with EN 60079-0.
• Optical radiation and very low temperature installations: new clause on optical radiation and annexes for extremely low ambient conditions.
• Initial inspection & documentation: introduction of mandatory initial inspection procedures and an equipment‑specific inspection schedule (Annex C).
• Annexes: include guidance on restricted gas migration through cables, hybrid mixtures, analyzer houses, type of protection “op”, and others.

Practical applications

EN 60079-14 is used to ensure safe electrical installations in industries where explosive atmospheres may occur:

• Oil & gas production and processing
• Petrochemical and chemical plants
• Refineries, LNG and gas terminals
• Pharmaceutical manufacturing
• Grain handling, food processing and cement plants
• Mining and bulk solids handling

Applying EN 60079-14 helps prevent ignition sources from electrical installations, ensures regulatory compliance, and supports safe commissioning through structured initial inspections and documentation.

Who should use this standard

• Electrical and instrumentation engineers
• Installation contractors and EPC firms
• Safety and compliance managers
• Inspection and maintenance teams (EN 60079-17 users)
• Certification bodies and notified bodies

Related standards

EN 60079-0, EN 60079-10-1/10-2, EN 60079-11, EN 60079-17, EN 60079-26, EN 60079-28, IEC/EN 60364 and other parts of the EN/IEC 60079 series. These standards should be consulted together for full compliance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2014
1DGRPHãþD
SIST EN 60079-14:2009
SIST EN 60079-14:2009/AC:2011
(NVSOR]LYQHDWPRVIHUHGHO1DþUWRYDQMHL]ELUDLQQDPHVWLWHYHOHNWULþQLK
LQãWDODFLM,(&
Explosive atmospheres - Part 14: Electrical installations design, selection and erection
(IEC 60079-14:2013)
Explosionsgefährdete Bereiche - Teil 14: Projektierung, Auswahl und Errichtung
elektrischer Anlagen (IEC 60079-14:2013)
Atmosphères explosives - Partie 14: Conception, sélection et construction des
installations électriques (IEC 60079-14:2013)
Ta slovenski standard je istoveten z: EN 60079-14:2014
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60079-14
NORME EUROPÉENNE
March 2014
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 60079-14:2008, EN 60079-14:2008/AC:2011

English version
Explosive atmospheres -
Part 14: Electrical installations design, selection and erection
(IEC 60079-14:2013)
Atmosphères explosives -  Explosionsgefährdete Bereiche -
Partie 14: Conception, sélection et Teil 14: Projektierung, Auswahl und
construction des installations électriques Errichtung elektrischer Anlagen
(CEI 60079-14:2013) (IEC 60079-14:2013)

This European Standard was approved by CENELEC on 2014-01-02. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2014 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-14:2014 E
Foreword
The text of document 31J/225/FDIS, future edition 5 of IEC 60079-14, prepared by SC 31J "Classification of
hazardous areas and installation requirements" of IEC/TC 31 "Equipment for explosive atmospheres" was
submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60079-14:2014.

The following dates are fixed:
• latest date by which the document has to be (dop) 2014-10-02
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-01-02
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60079-14:2008.

Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
Introduction of initial inspection Scope X
Introduction of definition “electrical equipment” 3.1.3 X
Introduction of definition “hybrid mixture ” 3.2.4 X
Note added to the definition “associated apparatus ” 3.5.2 X
Introduction of definition “radio frequency identification” 3.15 X
List for documents improved and extended: site, equipment, 4.2 X
installation and personnel
New clause for initial inspection 4.3 X
Specific requirements given in this standard based on the 4.4.1.2 X
current edition of the EN standards in the EN 60079 series.
New selection criteria for radiating equipment according to 5.7 X
EN 60079-0
New selection criteria for ultrasonic equipment according to 5.8 X
EN 60079-0
Specific requirements for cells and batteries used in 5.10  C1
transportable, portable and personal equipment aligned with
EN 60079-11
New structure for the selection of rotating electrical machines 5.11 X
New selection criteria for cells and batteries 5.14 X
New selection criteria for radio frequency identification tags 5.15 X
New selection criteria for gas detection equipment 5.16 X
The requirements for material composition of metallic 6.1 X
installation material aligned with the requirements for light
metal according to EN 60079 -0
Above hazardous area, the restriction of 3,5 m deleted 6.3.7 X

- 3 - EN 60079-14:2014
Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
New structure of the requirements for static electricity 6.5 X
according to EN 60079 -0 added
New requirements for electromagnetic radiation in 6.7 X
accordance with EN 60079-0
Improvement of the text for cabl es, cables for fixed and 9.3.1 X
flexible cables for fixed installation for easier reading
9.3.2
9.3.3
New structure of the requirements for cable entry system and 10 X
blanking elements with subclauses
10.1
- General
10.2
- Connections of cables to equipment
10.3
- Selection of cable glands with the new Table 10
10.4
- Additional requirements for cable glands other than Ex “d”,
10.5
Ex “t” or Ex “nR”
10.6
- Additional requirements for Ex “d”
10.7
- Additional requirements for Ex “t”
10.8
- Additional requirements for Ex “nR”
New structure for the requirements for rotating electrical 11 X
machines for all types of protections
New structure for the requirements for electric heating 13 X
systems including temperature monitoring, limiting
temperature, safety device and additional requirements for
electrical heat tracing system
New clause to limit the dissipation power of terminal boxes as 15.4 X
a function of the numbers of wire in relation to the cross -
section and the permissible continuous current with an
example.
Improvement of the text for simple apparatus with its 16.4 X
definition, limits and the variation in maximum power
dissipation based on the ambient temperature and an
alternative equation to calculate the max. surface
temperature.
New requirements for terminal boxes if containing more than 16.5  C2
one intrinsically safe circuits to avoid short circuits between
independent intrinsically safe circuits.
Improvement of the text for terminal boxes with non - 16.5.4 X
intrinsically and intrinsically safe circuits
New subclause for pressurized rooms and analyser houses 17.4 X
New clause for optical radiation 22 X
New annex for initial inspection with the equipment specific Annex C X
inspection schedule for all type of protections
New annex for electrical installations in extremely low Annex D X
ambient temperature
New annex for the restricted migration of gas through cables Annex E X
New annex for installation of electrical trace heating systems Annex F X
New annex for the requirements f or type of protection “op” – Annex K X
Optical radiation
New annex for hybrid mixtures Annex M X

Explanation of the types of significant changes:
A) Definitions
1 Minor and editorial changes: - Clarification

- Decrease of technical requirements
- Minor technical change
- Editorial corrections
These are changes which modify requirements in an editorial or a minor technical way. They include changes of
the wording to clarify technical requirements without any technical change, or a reduction in level of existing
requirement.
2 Extension:
- Addition of technical options
These are changes which add new or modify existing technical requirements, in a way that new options are given,
but without increasing t h e requirements for the design, selection and erection of existing
i ns t al l at i on s that are fully compliant with the previous standard. Therefore, these will not have to be
considered for existing installations in conformity with the preceding edition.
3 Major technical changes:
- addition of technical requirements
- increase of technical requirements
These are changes to technical requirements (addition, increase of the level or removal) made in a way that
an existing installation in conformity with the preceding edition will not always be able to fulfil the
requirements given in the later edition. These changes have to be considered for existing installations in
conformity with the preceding edition, f or which additional information is provided in B) below.

These changes represent the latest state-of-the-art technology. However, these changes should not normally
have an influence on existing installations.
B) Information about the background of “major technical changes”

C1 Due to the risk of gassing producing hydrogen from all cell types, adequate provision for venting is required
as the gassing can create an explosive condition in small enclosures. This condition would apply to
torches, multi meters, pocket gas sensors and similar items. Alternatively, where the equipment meets
the requirements for Equipment Group IIC, the requirement of degassing apertures or limitation of hydrogen
concentration does not apply.
C2 An individual intrinsically safe circuit is also safe under short- circuit conditions. The short- circuit
between two independent intrinsically safe circuits is not considered. Therefore the terminal boxes have to
meet additional requirements for IP rating as well for the mechanical impact to make sure that the
integrity of the enclosure is given also under worst case conditions.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60079-14:2013 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60034-5 NOTE Harmonized as EN 60034-5.
IEC/TS 60034-17 NOTE Harmonized as CLC/TS 60034-17.
IEC/TS 60034-25 NOTE Harmonized as CLC/TS 60034-25.
IEC 60079-2 NOTE Harmonized as EN 60079-2.
IEC 60079-5 NOTE Harmonized as EN 60079-5.
IEC 60079-29-2 NOTE Harmonized as EN 60079-29-2.
IEC 60079-30-2 NOTE Harmonized as EN 60079-30-2.
IEC 60079-31 NOTE Harmonized as EN 60079-31.
IEC 60332-2-2 NOTE Harmonized as EN 60332-2-2.
IEC 60332-3 Series NOTE Harmonized as EN 60332-3 Series (partly modified).
IEC 60529 NOTE Harmonized as EN 60529.
IEC 60742 NOTE Harmonized as EN 60742.

- 5 - EN 60079-14:2014
IEC 61008-1 NOTE Harmonized as EN 61008-1.
IEC 61010-1 NOTE Harmonized as EN 61010-1.
IEC 61241 Series NOTE Harmonized as EN 61241 Series (not modified).
1)
IEC 61241-1 NOTE Harmonized as EN 61241-1 .
IEC 61241-4 NOTE Harmonized as EN 61241-4.
IEC 61241-11 NOTE Harmonized as EN 61241-11.
IEC 61439-1 NOTE Harmonized as EN 61439-1.
ISO 10807 NOTE Harmonized as EN ISO 10807.

1)
Superseded by EN 60079-31.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

Publication Year Title EN/HD Year

IEC 60034-1 - Rotating electrical machines - EN 60034-1 -
Part 1: Rating and performance

IEC 60060-1 - High-voltage test techniques - EN 60060-1 -
Part 1: General definitions and test
requirements
IEC 60079 Series Explosive atmospheres EN 60079 Series

IEC 60079-0 - Explosive atmospheres - EN 60079-0 -
Part 0: Equipment - General requirements

IEC 60079-1 - Explosive atmospheres - EN 60079-1 -
Part 1: Equipment protection by flameproof
enclosures "d"
IEC 60079-6 - Explosive atmospheres - EN 60079-6 -
Part 6: Equipment protection by oil immersion
"o"
IEC 60079-7 - Explosive atmospheres - EN 60079-7 -
Part 7: Equipment protection by increased
safety "e"
IEC 60079-10-1 - Explosive atmospheres - EN 60079-10-1 -
Part 10-1: Classification of areas - Explosive
gas atmospheres
IEC 60079-10-2 - Explosive atmospheres - EN 60079-10-2 -
Part 10-2: Classification of areas - Combustible
dust atmospheres
IEC 60079-11 - Explosive atmospheres - EN 60079-11 -
Part 11: Equipment protection by intrinsic safety
"i"
IEC 60079-13 - Explosive atmospheres - EN 60079-13 -
Part 13: Equipment protection by pressurized
room "p"
IEC 60079-15 - Explosive atmospheres - EN 60079-15 -
Part 15: Equipment protection by type of
protection "n"
IEC/TR 60079-16 - Electrical apparatus for explosive gas - -
atmospheres -
Part 16: Artificial ventilation for the protection
of analyzer(s) houses
IEC 60079-17 - Explosive atmospheres - EN 60079-17 -
Part 17: Electrical installations inspection and
maintenance
IEC 60079-18 - Explosive atmospheres - EN 60079-18 -
Part 18: Equipment protection
by encapsulation "m"
- 7 - EN 60079-14:2014
Publication Year Title EN/HD Year
IEC 60079-19 - Explosive atmospheres - EN 60079-19 -
Part 19: Equipment repair, overhaul and
reclamation
IEC 60079-26 - Explosive atmospheres - EN 60079-26 -
Part 26: Equipment with equipment protection
level (EPL) Ga
IEC 60079-28 - Explosive atmospheres - EN 60079-28 -
Part 28: Protection of equipment and
transmission systems using optical radiation

IEC 60079-29-1 - Explosive atmospheres - EN 60079-29-1 -
Part 29-1: Gas detectors - Performance
requirements of detectors for flammable gases

IEC 60079-29-4 - Explosive atmospheres - EN 60079-29-4 -
Part 29-4: Gas detectors - Performance
requirements of open path detectors for
flammable gases
IEC 60079-30-1 - Explosive atmospheres - EN 60079-30-1 -
Part 30-1: Electrical resistance trace
heating - General and testing requirements

IEC 60243-1 - Electric strength of insulating materials - EN 60243-1 -
Test methods -
Part 1: Tests at power frequencies

IEC 60332-1-2 - Tests on electric and optical fibre cables under EN 60332-1-2 -
fire conditions -
Part 1-2: Test for vertical flame propagation for
a single insulated wire or cable - Procedure for
1 kW pre-mixed flame
IEC 60364 Series Low voltage electrical installations HD 60364 Series

IEC 60364-4-41 2005 Low-voltage electrical installations - HD 60364-4-41 2007
(mod) Part 4-41: Protection for safety - Protection + corr. July 2007
against electric shock
IEC 60950 Series Information technology equipment - EN 60950 Series
Safety
IEC 61010-1 - Safety requirements for electrical EN 61010-1 -
equipment for measurement, control
and laboratory use -
Part 1: General requirements
IEC 61285 - Industrial-process control - Safety of analyser EN 61285 -
houses
IEC 61558-2-6 - Safety of transformers, reactors, power supply EN 61558-2-6 -
units and similar products for supply voltages
up to 1 100 V -
Part 2-6: Particular requirements and tests for
safety isolating transformers and power supply
units incorporating safety isolating transformers

IEC 62305-3 (mod) 2010 Protection against lightning - EN 62305-3 2011
Part 3: Physical damage to structures and life
hazard
IEC 60079-14 ®
Edition 5.0 2013-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 14: Electrical installations design, selection and erection

Atmosphères explosives –
Partie 14: Conception, sélection et construction des installations électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XG
ICS 26.260.20 ISBN 978-2-8322-1276-9

– 2 – 60079-14 © IEC:2013
CONTENTS
FOREWORD . 11
INTRODUCTION . 16
1 Scope . 18
2 Normative references . 19
3 Terms and definitions . 20
3.1 General . 20
3.2 Hazardous areas . 21
3.3 Flameproof enclosure . 22
3.4 Increased safety . 22
3.5 Intrinsic safety . 23
3.6 Intrinsic safety parameters . 24
3.7 Pressurization . 24
3.8 Type of protection “n” . 24
3.9 oil-immersion “o” . 25
3.10 powder filling “q” . 25
3.11 encapsulation “m” . 25
3.12 protection by enclosure “t” . 25
3.13 Electrical supply systems . 25
3.14 Equipment . 25
3.15 radio frequency identification RFID . 26
4 General . 26
4.1 General requirements . 26
4.2 Documentation . 27
4.3 Initial inspection . 28
4.4 Assurance of conformity of equipment. 28
4.4.1 Equipment with certificates according to IEC standards . 28
4.4.2 Equipment without certificates according to IEC standards . 28
4.4.3 Selection of repaired, second hand or existing equipment . 29
4.5 Qualifications of personnel . 29
5 Selection of equipment . 29
5.1 Information requirements . 29
5.2 Zones . 30
5.3 Relationship between equipment protection levels (EPLs) and zones . 30
5.4 Selection of equipment according to EPLs . 30
5.4.1 General . 30
5.4.2 Relationship between EPLs and types of protection . 30
5.4.3 Equipment for use in locations requiring EPL “Ga” or “Da” . 32
5.4.4 Equipment for use in locations requiring EPL “Gb” or “Db” . 32
5.4.5 Equipment for use in locations requiring EPL “Gc” or “Dc” . 32
5.5 Selection according to equipment grouping . 32
5.6 Selection according to the ignition temperature of the gas, vapour or dust
and ambient temperature . 33
5.6.1 General . 33
5.6.2 Gas or vapour . 33
5.6.3 Dust . 34
5.7 Selection of radiating equipment . 36
5.7.1 General . 36

60079-14 © IEC:2013 – 3 –
5.7.2 Ignition process . 36
5.8 Selection of ultrasonic equipment . 36
5.8.1 General . 36
5.8.2 Ignition process . 37
5.9 Selection to cover external influences . 37
5.10 Selection of transportable, portable and personal equipment . 38
5.10.1 General . 38
5.10.2 Transportable and portable equipment . 39
5.10.3 Personal equipment . 39
5.11 Rotating electrical machines . 39
5.11.1 General . 39
5.11.2 Environmental Factors for “Ex” machine installation . 40
5.11.3 Power and accessory connections, grounding . 40
5.11.4 Motors fed from a converter supply . 41
5.11.5 Switching motors above 1kV . 41
5.12 Luminaires . 42
5.13 Plugs and socket outlets . 42
5.13.1 General . 42
5.13.2 Specific requirements for explosive dust atmospheres . 42
5.13.3 Location. 42
5.14 Cells and batteries . 42
5.14.1 Charging of secondary cells and batteries . 42
5.14.2 Ventilation . 43
5.15 RFID tags . 43
5.15.1 General . 43
5.15.2 Passive RFID tags . 43
5.15.3 Mounting RFID tags . 43
5.16 Gas detection equipment . 43
6 Protection from dangerous (incendive) sparking . 44
6.1 Light metals as construction materials . 44
6.2 Danger from live parts . 44
6.3 Danger from exposed and extraneous conductive parts . 44
6.3.1 General . 44
6.3.2 TN type of system earthing . 45
6.3.3 TT type of system earthing . 45
6.3.4 IT type of system earthing . 45
6.3.5 SELV and PELV systems . 45
6.3.6 Electrical separation . 45
6.3.7 Non Ex electrical equipment above hazardous areas . 45
6.4 Potential equalization . 46
6.4.1 General . 46
6.4.2 Temporary bonding . 47
6.5 Static electricity . 47
6.5.1 General . 47
6.5.2 Avoidance of a build-up of electrostatic charge on
construction and protecting parts for locations requiring EPL
“Ga”, “Gb” and “Gc” . 47
6.5.3 Avoidance of a build-up of electrostatic charge on
construction and protecting parts for locations requiring EPL
“Da”, “Db” and “Dc” . 49

– 4 – 60079-14 © IEC:2013
6.6 Lightning protection . 49
6.7 Electromagnetic radiation . 49
6.7.1 General . 49
6.7.2 Radio frequency received in hazardous areas . 49
6.8 Cathodically protected metallic parts . 50
6.9 Ignition by optical radiation . 50
7 Electrical protection . 51
8 Switch-off and electrical isolation . 51
8.1 General . 51
8.2 Switch-off . 51
8.3 Electrical isolation . 51
9 Cables and wiring systems . 52
9.1 General . 52
9.2 Aluminium conductors . 52
9.3 Cables . 52
9.3.1 General . 52
9.3.2 Cables for fixed installations . 52
9.3.3 Flexible cables for fixed installations (excluding intrinsically
safe circuits) . 53
9.3.4 Flexible cables supplying transportable and portable
equipment (excluding intrinsically safe circuits) . 53
9.3.5 Single insulated wires (excluding intrinsically safe circuits) . 54
9.3.6 Overhead lines . 54
9.3.7 Avoidance of damage . 54
9.3.8 Cable surface temperature. 54
9.3.9 Resistance to flame propagation . 54
9.4 Conduit systems . 55
9.5 Additional requirements . 56
9.6 Installation requirements . 56
9.6.1 Circuits traversing a hazardous area . 56
9.6.2 Terminations . 56
9.6.3 Unused cores . 56
9.6.4 Openings in walls . 56
9.6.5 Passage and collection of flammables . 56
9.6.6 Accumulation of dust . 57
10 Cable entry systems and blanking elements . 57
10.1 General . 57
10.2 Selection of cable glands . 57
10.3 Connections of cables to equipment . 58
10.4 Additional requirements for entries other than Ex “d”, Ex “t” or Ex “nR” . 59
10.5 Unused openings . 59
10.6 Additional requirements for type of protection “d” – Flameproof
enclosures . 59
10.6.1 General . 59
10.6.2 Selection of cable glands . 60
10.7 Additional requirements for type of protection “t” – Protection by
enclosure . 60
10.8 Additional requirements for type of protection “nR” – Restricted breathing
enclosure . 61

60079-14 © IEC:2013 – 5 –
11 Rotating electrical machines . 61
11.1 General . 61
11.2 Motors with type of protection “d” – Flameproof enclosures . 61
11.2.1 Motors with a converter supply . 61
11.2.2 Reduced-voltage starting (soft starting) . 62
11.3 Motors with type of protection “e” – Increased safety . 62
11.3.1 Mains-operated . 62
11.3.2 Winding temperature sensors . 63
11.3.3 Machines with rated voltage greater than 1 kV . 64
11.3.4 Motors with converter supply . 64
11.3.5 Reduced-voltage starting (soft starting) . 64
11.4 Motors with type of protection “p” and “pD” – Pressurized enclosures . 64
11.4.1 Motors with a converter supply . 64
11.4.2 Reduced-voltage starting (soft starting) . 65
11.5 Motors with type of protection “t” – Protection by enclosures supplied at
varying frequency and voltage . 65
11.5.1 Motors with a converter supply . 65
11.5.2 Reduced-voltage starting (soft starting) . 66
11.6 Motors with type of protection “nA” – Non-sparking . 66
11.6.1 Motors with converter supply . 66
11.6.2 Reduced-voltage starting (soft starting) . 66
11.6.3 Machines with rated voltage greater than 1 kV . 66
12 Luminaires . 67
13 Electric heating systems . 67
13.1 General . 67
13.2 Temperature monitoring . 67
13.3 Limiting temperature . 68
13.4 Safety device . 68
13.5 Electrical trace heating systems . 69
14 Additional requirements for type of protection “d” – Flameproof enclosures . 69
14.1 General . 69
14.2 Solid obstacles . 70
14.3 Protection of flameproof joints . 70
14.4 Conduit systems . 71
15 Additional requirements for type of protection “e” – Increased safety . 71
15.1 General . 71
15.2 Maximum dissipated power of terminal box enclosures . 72
15.3 Conductor terminations . 72
15.4 Maximum number of conductors in relation to the cross-section and the
permissible continuous current . 73
16 Additional requirements for types of protection “i” – Intrinsic safety . 73
16.1 General . 73
16.2 Installations to meet the requirements of EPL “Gb” or “Gc” and “Db” or
“Dc” . 74
16.2.1 Equipment . 74
16.2.2 Cables . 75
16.2.3 Earthing of intrinsically safe circuits . 79
16.2.4 Verification of intrinsically safe circuits . 80
16.3 Installations to meet the requirements of EPL “Ga” or “Da” . 81

– 6 – 60079-14 © IEC:2013
16.4 Simple apparatus . 82
16.5 Terminal boxes . 84
16.5.1 General . 84
16.5.2 Terminal boxes with only one intrinsically safe circuit . 84
16.5.3 Terminal boxes with more than one intrinsically safe circuit . 84
16.5.4 Terminal boxes with non-intrinsically safe and intrinsically
safe circuits . 85
16.5.5 Plugs and sockets used for external connections . 85
16.6 Special applications . 85
17 Additional requirements for pressurized enclosures . 85
17.1 General . 85
17.2 Type of protection “p” . 86
17.2.1 General . 86
17.2.2 Ducting . 86
17.2.3 Action to be taken on failure of pressurization. 87
17.2.4 Multiple pressurized enclosures with a common safety device . 89
17.2.5 Purging . 89
17.2.6 Protective gas . 90
17.3 Type of protection “pD” . 90
17.3.1 Sources of protective gas . 90
17.3.2 Automatic switch-off . 91
17.3.3 Alarm . 91
17.3.4 Common source of protective gas . 91
17.3.5 Switching on electrical supply . 91
17.4 Rooms for explosive gas atmosphere . 91
17.4.1 Pressurized rooms . 91
17.4.2 Analyser houses . 92
18 Additional requirements for type of protection “n” . 92
18.1 General . 92
18.2 “nR” equipment . 92
18.3 Combinations of terminals and conductors for general connection and
junction boxes . 93
18.4 Conductor terminations . 93
19 Additional requirements for type of protection “o”– Oil immersion . 93
19.1 General . 93
19.2 External connections . 94
20 Additional requirements for type of protection “q” – Powder filling . 94
21 Additional requirements for type of protection “m” – Encapsulation . 94
22 Additional requirements for type of protection “op” – Optical radiation . 94
23 Additional requirements for type of protection “t” – Protection by enclosure . 95
Annex A (normative) Knowledge, skills and competencies of responsible persons,
operatives/technicians and designers . 96
A.1 Scope . 96
A.2 Knowledge and skills . 96
A.2.1 Responsible persons . 96
A.2.2 Operatives/technicians (selection and erection) . 96
A.2.3 Designers (design and selection) . 96
A.3 Competencies . 97

60079-14 © IEC:2013 – 7 –
A.3.1 General .
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