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IEC 60079-14:2013

(Main)

Explosive atmospheres - Part 14: Electrical installations design, selection and erection

Explosive atmospheres - Part 14: Electrical installations design, selection and erection

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.
The contents of the corrigendum of January 2016, the interpretation sheet 1 of February 2017 and March 2020 have been included in this copy.

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

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.
Le contenu du corrigendum de janvier 2016, la feuille d'interprétation 1 de février 2017 et de mars 2020 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
27-Nov-2013
ICS
01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
29.260.20 - Electrical apparatus for explosive atmospheres
Technical Committee
SC 31J - Classification of hazardous areas and installation requirements
Drafting Committee
MT 60079-14 - TC 31/SC 31J/MT 60079-14
Current Stage
Ref Project

Relations

Corrected By
IEC 60079-14:2013/COR1:2016 - Corrigendum 1 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection
Effective Date
05-Sep-2023
Revised
IEC 60079-14:2013/ISH2:2020 - Interpretation sheet 2 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection
Effective Date
05-Sep-2023
Revises
IEC 60079-14:2007 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection
Effective Date
05-Sep-2023
Revised
IEC 60079-14:2024 - Explosive atmospheres - Part 14: Electrical installation design, selection and installation of equipment, including initial inspection
Effective Date
05-Sep-2023
Revised
IEC 60079-14:2013/ISH1:2017 - Intrepretation sheet 1 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection
Effective Date
05-Sep-2023

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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

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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 – IEC 60079-14:2013/ISH1:2017
 IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-14
Edition 5.0  2013-11
EXPLOSIVE ATMOSPHERES –
Part 14: Electrical installations design, selection and erection

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 31J: Classification of hazardous
areas and installation requirements, of IEC technical committee 31: Equipment for explosive
atmospheres.
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
31J/268/ISH 31J/270/RVD
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
INTERPRETATION SHEET
Interpretation sheet for IEC 60079-14:2013, Explosive atmospheres – Part 14: Electrical
installations design, selection and erection
Following decision No 1 of the SC 31J meeting in Frankfurt in 2016, the issuing of an
Interpretation Sheet for IEC 60079-14:2013 was requested, in order to clarify the issues
relating to the installation of the converter supply or reduced voltage starting of electric
motors.
Details of interpretation:
Interpretation of sub clauses 11.2.1 b), 11.2.2 b), 11.3.5 b), 11.4.1 b) 11.4.2 b), 11.5.1 b),
11.5.2 b), 11.6.1 b) and 11.6.2 b) for Motors with converter supply or reduced voltage
starting
The motor has not been type-tested for this duty as a unit in association with the converter.
In this case, means (or equipment) for direct temperature control by embedded temperature
sensors specified in the motor documentation or other effective measures for limiting the
surface temperature of the motor housing shall be provided. The effectiveness of the
temperature control shall take into consideration power, speed range, torque and frequency
for the duty required and shall be verified and documented. The action of the protective
device shall cause the motor to be electrically disconnected.”

ICS 26.260.20
 IEC 2017
Question
Is physical disconnection, such as a switch (circuit breaker) or contactor, required to
accomplish the intent of this requirement ?
Interpretation
The intention of this requirement is to protect the machine from excessive surface
temperatures.
Any action within the control circuit for the motor that accomplishes one of the following
satisfactorily meets the intent of this requirement:
• direct physical disconnection resulting in no output voltage to the motor, or,
• control circuit intervention such as ceasing modulation, resulting in the motor not
operating.
NOTE In this case, voltage to a motor may still exist, but the motor does not operate.

 IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60079-14
Edition 5.0  2013-11
EXPLOSIVE ATMOSPHERES –
Part 14: Electrical installations design, selection and erection

INTERPRETATION SHEET 2
This interpretation sheet has been prepared by subcommittee 31J: Classification of hazardous
areas and installation requirements, of IEC technical committee 31: Equipment for explosive
atmospheres.
The text of this interpretation sheet is based on the following documents:
DISH Report on voting
31J/302/DISH 31J/303/RVDISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.

___________
Background
With changes to the Type of Protection designations in the IEC 60079 Series, a number of
these Type of Protection designations are not identified in the current edition of
IEC 60079-14. This may create confusion for end users regarding the correct application of
equipment with these Types of Protection.
Question
How should equipment be marked with new Type of Protection designations be handled in
accordance with IEC 60079-14?
Interpretation
Equipment marked with new Type of Protection designations shall be applied in accordance
with IEC 60079-14 requirements based on the following points and IEC 60079-14:2013,
Table 2.
ICS 26.260.20
– 2 – IEC 60079-14:2013/ISH2:2020
 IEC 2020
• Ex "eb" should be treated as equivalent to Ex "e"
• Ex "ec" should be treated as equivalent to Ex "nA"
• Ex "db" should be treated as equivalent to Ex "d"
• Ex "dc" requirements should be based on Ex "d" requirements but is only suitable for
EPL Gc
• Ex "ob" should be treated as equivalent to Ex "o"
• Ex "oc" requirements should be based on Ex "o" requirements but is only suitable for
EPL Gc
– 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.
...

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