Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"

This part of IEC 60079 contains specific requirements for the construction and testing of lectrical equipment with the type of protection flameproof enclosure “d”, intended for use in explosive gas atmospheres.
This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard will take precedence.

Explosionsgefährdete Bereiche - Teil 1: Geräteschutz durch druckfeste Kapselung „d“

Atmosphères explosives - Partie 1: Protection de l'appareil par enveloppes antidéflagrantes "d"

IEC 60079-1: 2014 contient les exigences spécifiques de construction et d'essai du matériel électrique à enveloppe antidéflagrante, mode de protection "d", destiné à être utilisé dans les atmosphères explosives gazeuses. La présente Norme complète et modifie les exigences générales de l'IEC 60079-0. Lorsqu'une exigence de cette norme entre en conflit avec une exigence de l'IEC 60079-0, l'exigence de la présente norme prévaudra. Cette septième édition annule et remplace la sixième édition parue en 2007. Cette édition constitue une révision technique. Les nombreux changements sont identifiés dans l'avant-propos du document. Mots clés : enveloppe antidéflagrante "d", atmosphères explosives IEC 60079-1: 2014 contient les exigences spécifiques de construction et d'essai du matériel électrique à enveloppe antidéflagrante, mode de protection "d", destiné à être utilisé dans les atmosphères explosives gazeuses. La présente Norme complète et modifie les exigences générales de l'IEC 60079-0. Lorsqu'une exigence de cette norme entre en conflit avec une exigence de l'IEC 60079-0, l'exigence de la présente norme prévaudra. Cette septième édition annule et remplace la sixième édition parue en 2007. Cette édition constitue une révision technique. Les nombreux changements sont identifiés dans l'avant-propos du document. Mots clés : enveloppe antidéflagrante "d", atmosphères explosives gazeuses

Eksplozivne atmosfere - 1. del: Zaščita opreme z neprodirnim okrovom "d"

Ta del standarda IEC 60079 vsebuje specifične zahteve za konstrukcijo in preskušanje zaščite električne opreme z neprodirnim okrovom "d", ki je namenjena za uporabo v eksplozivnih plinskih atmosferah.
Ta standard dopolnjuje in spreminja splošne zahteve standarda IEC 60079-0. Kadar je zahteva iz tega standarda v nasprotju z zahtevo iz standarda IEC 60079-0, ima prednost zahteva iz tega standarda.

General Information

Status
Published
Publication Date
09-Dec-2014
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-Oct-2014
Due Date
25-Dec-2014
Completion Date
10-Dec-2014

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SLOVENSKI STANDARD
SIST EN 60079-1:2015
01-januar-2015
(NVSOR]LYQHDWPRVIHUHGHO=DãþLWDRSUHPH]QHSURGLUQLPRNURYRPG

Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d"

Explosionsgefährdete Bereiche - Teil 1: Geräteschutz durch druckfeste Kapselung „d“

Atmosphères explosives - Partie 1: Protection de l'appareil par enveloppes
antidéflagrantes "d"
Ta slovenski standard je istoveten z: EN 60079-1:2014
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 60079-1:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60079-1:2015
---------------------- Page: 2 ----------------------
SIST EN 60079-1:2015
EUROPEAN STANDARD EN 60079-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 29.260.20 Supersedes EN 60079-1:2007
English Version
Explosive atmospheres - Part 1: Equipment protection by
flameproof enclosures "d"
(IEC 60079-1:2014)

Atmosphères explosives - Partie 1: Protection de l'appareil Explosionsgefährdete Bereiche - Teil 1: Geräteschutz

par enveloppes antidéflagrantes "d" durch druckfeste Kapselung "d"
(CEI 60079-1:2014) (IEC 60079-1:2014)

This European Standard was approved by CENELEC on 2014-08-01. 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.
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 60079-1:2014 E
---------------------- Page: 3 ----------------------
SIST EN 60079-1:2015
EN 60079-1:2014 - 2 -
Foreword

The text of document 31/1111/FDIS, future edition 7 of IEC 60079-1, prepared by IEC/TC 31 "Equipment for

explosive atmospheres" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN 60079-1:2014.
The following dates are fixed:
(dop) 2015-05-01
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-08-01
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60079-1:2007.

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.

This document has been prepared under a mandate given to CENELEC by the European Commission and

the European Free Trade Association, and supports essential requirements of EU Directive.

For the relationship with EU Directive see informative Annex ZZ, which is an integral part of this document.

Endorsement notice

The text of the International Standard IEC 60079-1:2014 was approved by CENELEC as a European

Standard without any modification.
---------------------- Page: 4 ----------------------
SIST EN 60079-1:2015
- 3 - EN 60079-1:2014
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 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60061 - Lamp caps and holders together with gauges - -
for the control of interchangeability and safety
IEC 60079-0 (mod) - Explosive atmospheres - Part 0: Equipment - EN 60079-0 -
General requirements
+A11 2013
IEC 60079-7 - Explosive atmospheres - Part 7: Equipment EN 60079-7 -
protection by increased safety "e"
IEC 60079-11 - Explosive atmospheres - Part 11: Equipment EN 60079-11 -
protection by intrinsic safety "i"
IEC 60079-15 - Explosive atmospheres - Part 15: Equipment EN 60079-15 -
protection by type of protection "n"
IEC 60127 series Miniature fuses EN 60127 series
ISO 965-1 - ISO general purpose metric screw threads - - -
Tolerances – Part 1: Principles and basic data
ISO 965-3 - ISO general purpose metric screw threads - - -
Tolerances – Part 3: Deviations for
constructional screw threads
ISO 2738 - Sintered metal materials, excluding EN ISO 2738 -
hardmetals - Permeable sintered metal
materials - Determination of density, oil
content and open porosity
ISO 4003 - Permeable sintered metal materials - EN 24003 -
Determination of bubble test pore size
ISO 4022 - Permeable sintered metal materials - EN ISO 4022 -
Determination of fluid permeability
ANSI/ASME B 1.20.1 - - -
---------------------- Page: 5 ----------------------
SIST EN 60079-1:2015
EN 60079-1:2014 - 4 -
Annex ZY
(informative)
Significant changes between this European Standard and EN 60079-1:2007
This European Standard supersedes EN 60079-1:2007.
The significant changes with respect to EN 60079-1:2007 are as listed below.
Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
Normative references 2 X
(Removal of the edition date from the reference for IEC
60079-0)
Requirements for level of protection “da” 4.2 X
(Catalytic sensors for combustible gas detectors)
Requirements for level of protection “dc” 4.4, 15.5 X
(“Enclosed break” devices from IEC 60079-15)
Flameproof joints, General requirements 5.1 X
(Documentation clarification and examples of corrosion inhibiting
grease)
Flameproof joints, General requirements 5.1 X
(Specific Conditions of Use that joints are not intended to be
repaired)
Flameproof joints, General requirements 5.1 X
(Electroplating more than 0.008 mm think)
Non-threaded joints, Gap (i) 5.2.2 X
(Intentional gaps between surface for flanged joints)
Serrated joints 5.2.8 X
(Use and test requirements)
Multi-step joints 5.2.9 X
(Not less than 3 adjacent segments and two path changes)
Minimum width of joint and maximum gap for enclosures of groups Table 2 X
IIA and IIB
(Maximum gaps for flanged, cylindrical or spigot joints of 9,5 mm
minimum width and volume greater than 2,000 cm3)
Minimum width of joint and maximum gap for enclosures of groups I, Table 2, X
IIA, IIB and IIC Table 3
(ISO 80000-1 for constructional value rounding)
Cylindrical threaded joints Table 4 X
(ISO 965-1 standard in respect of thread form or quality of fit)
Taper threaded joints Table 5 X
(External and internal thread construction)
Cemented joints
6.1.2 C1
(Supplemental mechanical means of securement)

Cemented joints 6.1.2 X

(Evaluation criteria if there is leakage)
Fused glass joints 6.2 X
(Glass-to-metal joints)
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SIST EN 60079-1:2015
- 5 - EN 60079-1:2014
Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
Thermal tests of breathing and draining devices 10.9.3.2 X
(Temperature class based on external surface temperature after the
10 min test period)
Test of the ability of the breathing and draining device to withstand 10.9.3.4 X
pressure
(Relocated from before thermal tests to after the non-transmission
test)
Ex component certificate 10.9.4 X
(Service temperature range for non-metallic enclosures per IEC
60079-0)
Fasteners and openings 11 X
(Relocation of blanking element content to Clauses 13.8 and C.2.3)
Fasteners and openings, Property class or yield stress 11.3 X
(Certificate specific condition of use)
Fasteners and openings 11.8 X
(Openings in the wall of the enclosure)
Materials 12.8 C2
(Material limitation in acetylene atmospheres)
Entries for flameproof enclosures, General 13.1 X
(Metric and NPT threaded entries)
Entries for flameproof enclosures, General 13.1 X
(Group I non-threaded joints)
Entries for flameproof enclosures, Non-threaded holes 13.3 X
(Group I application)
Entries for flameproof enclosures, Cable glands 13.4 X
(Group I application)
Cable glands, Conduit sealing devices 13.4,13.5 X
(Documentation to facilitate mounting)
Plugs and sockets and cable couplers 13.6.4 C3
(Load requirement for arc-quenching test)
Bushings 13.7 X
(Documentation to facilitate mounting)
Blanking elements 13.8 X
(Relocated from Clause 11)
Verification and tests Table 6 X
(Maximum surface temperature conditions)
Type tests 15 X
(Sequence and number of samples for tests)
Determination of explosion pressure, General 15.2.2.2 X
(Devices that can cause turbulence)
Determination of explosion pressure, General 15.2.2.2 X
(Number of tests for Group IIC)
Determination of explosion pressure, General 15.2.2.4 X
(Pressure pilling for Group IIB)
Determination of explosion pressure, General 15.2.2.5 X
(Equipment marked for a single gas)
Overpressure test, General 15.2.3 X
(Low ambient overpressure tests not required)
---------------------- Page: 7 ----------------------
SIST EN 60079-1:2015
EN 60079-1:2014 - 6 -
Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
Overpressure test – First method (static) 15.2.3.2 X
(3 times option when routine batch testing)
Overpressure test – First method (static) 15.2.3.2 X
(Adjustment for low ambient due to small size of equipment)
Overpressure test – Second method (dynamic) 15.2.3.3 X
(Number of tests to be made)
Test for non-transmission of an internal ignition 15.3 X
(Clarification regarding grease)
Reduction in length of a threaded joint for non-transmission test Table 9 X
(ISO 965-1 and 965-3 standards in respect of thread form and
quality of fit)
Test factors to increase pressure or test gap Table 10 X
(Group IIC adjustments for elevated ambients)

Test for non-transmission of an internal ignition, Groups I, IIA and IIB 15.3.2.3 X

(Number of tests to be made)

Test for non-transmission of an internal ignition, Group IIC testing by 15.3.3.2 X

increased gap
(Number of tests to be made)
Test for non-transmission of an internal ignition, Group IIC 15.3.3.4 X
(Oxygen enrichment of test gases)
Thermal tests of enclosures with breathing and draining devices 15.4.3.1 X
(Temperature class based on external surface temperature after the
10 min test period)
Tests for “dc” devices 15.5 X
(“Enclosed break” devices from IEC 60079-15)
Routine tests, General 16.1.2 X
(Adjustment for low ambient due to small size of equipment)
Routine tests, General 16.1.3 X
(Options when second method is chosen)
Routine tests, General 16.3 X
(Welded joint inspection options)
Routine tests, General 16.6 X
(Allowance for batch testing)
Switchgear for Group I 17.2.2, X
(Clarifying need for compliance with EPL Mb types of protection) 17.2.3
Non-metallic enclosures and non-metallic parts of enclosures, 19.1 X
General
(Exception for cemented joints)
Non-metallic enclosures and non-metallic parts of enclosures, 19.2 X
Resistance to tracking and creepage distances
(Reference to both IEC 60079-7 and or IEC 60079-15)
Non-metallic enclosures and non-metallic parts of enclosures, 19.3 X
Requirements for type tests
(Clarification of test sequence)
---------------------- Page: 8 ----------------------
SIST EN 60079-1:2015
- 7 - EN 60079-1:2014
Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
Instructions 21 X
(Indication that repair of flamepaths is not intended)
Bushings C.2.1.4 X
(Documentation regarding numbers of cores)
Bushings C.2.1.4 X
(Criteria for non-transmission test)
Bushings C.2.1.4 X
(Evaluation criteria if there is leakage)
Flameproof joints, Threaded joints C.2.2.1 X
(Requirement options)
Flameproof joints, Non-threaded joints C.2.2.2 X
(Group I application)
Constructional requirements for Ex blanking elements C.2.3.1 X
(Relocated from Clause 11)
Constructional requirements for Ex blanking elements C.2.3.2, X
(Metric and NPT Ex blanking elements) C.2.3.3
Constructional requirements for Ex blanking elements C.2.3.4 X
(Group I non-threaded construction)
Sealing test, General C.3.1.1 X
(Allowance for re-tightening)
Cable glands and conduit sealing devices with sealing ring C.3.1.2 X
(Mandrel to be corrosion-resistant metal)
Type tests for Ex blanking elements, Torque test C.3.3.1 X
(Test-block to be steel)
Tightening torque values Table C.1 X
(Addition of < 16 mm thread size)
Tightening torque values Table C.2 X
(Addition of NPT thread sizes)
Ex component enclosure requirements D.3.8 C4
(Markings content)
Ex component enclosure requirements D.3.10 X
(Certificate content)
Utilization of an Ex component enclosure certificate to D.4.1 X
prepare an equipment certificate, Procedure
(Devices that can create significant turbulence)
Acceptable primary cells Table E.1 X
(Addition of Type B cells)
Acceptable primary cells Table E.1 C5
(Removal of Type T cells)
Acceptable secondary cells Table E.2 X
(Addition of Lithium type cells)
Prevention of excessive temperature and cell damage E.4.1.2 X
(Application of IEC 60079-11 requirement)
Prevention of inadvertent charging of a battery by other E.4.3 X
voltage sources in the enclosure
(Construction not requiring additional protection)
---------------------- Page: 9 ----------------------
SIST EN 60079-1:2015
EN 60079-1:2014 - 8 -
Type
Significant Changes Clause Minor and Extension Major
editorial technical
changes changes
Recharging of secondary cells inside flameproof enclosures E.5.1 X
(Additional battery options)
Introduction of an alternative risk assessment method Annex G X
encompassing equipment protection levels’ for Ex equipment
(Removal of previous Informative Annex)
Additional requirements for Flameproof enclosures with an Annex G X
internal source of release (containment system)
(Addition of new Normative Annex)
Requirements for machines with flameproof “d” enclosures Annex H X
fed from converters
(Addition of new Normative Annex)
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 requirements for equipment that was fully compliant with the previous standard. Therefore, these will not have to be

considered for products 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 a product 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 products in conformity with the preceding edition. For these changes additional information is

provided in clause B) below.

Note These changes represent current technological knowledge. However, these changes should not normally

have an influence on equipment already placed on the market.
B) Information about the background of ‘Major technical changes’

C1 – Supplemental mechanical means of securing the cemented joint shall not be defeated by the opening of doors or covers

that are intended to be opened during installation or maintenance. For example, in the images below for a luminaire

incorporating a cemented joint between the lens and the enclosure cover, the construction

shown in the second image would be in accordance with this requirement, while the

construction shown in the first image would not.

C2 – Addition of material limitations of enclosures of equipment and enclosures of Ex components for external mounting, if

constructed of copper or copper alloys, when used in explosive gas atmospheres containing acetylene (12.8).

C3 – Addition of power factor requirement for evaluating the ability of a plug and socket to remain flameproof during the arc-

quenching period while opening a test circuit (13.6.4).

C4 – Addition of marking requirements for Ex component enclosures, in addition to the requirements for marking of Ex

components given in IEC 60079-0 (D.3.8).
C5 – Removal of Type T cells as acceptable primary cells (Table E.1).
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SIST EN 60079-1:2015
- 9 - EN 60079-1:2014
Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives

This European Standard has been prepared under a mandate given to CENELEC by the European

Commission and the European Free Trade Association and within its scope the standard covers only

the following essential requirements out of those given in Annex II of the EC Directive 94/9/EC:

– ER 1.0.1, ER 1.0.2 (partly), ER 1.0.3, ER 1.0.4 (partly), ER 1.0.5, ER 1.0.6
– ER 1.1

– ER 1.2.1 (partly), ER 1.2.2 (partly), ER 1.2.3, ER 1.2.6, ER 1.2.7, ER 1.2.8, ER 1.2.9

– ER 1.3.1, ER 1.3.4
– ER 1.4
– ER 1.5
– ER 1.6.4
– ER 2.0
– ER 2.1
– ER 2.2.1
– ER 2.3

Compliance with this standard provides one means of conformity with the specified essential

requirements of the Directive[s] concerned.

WARNING: Other requirements and other EC Directives may be applicable to the products

falling within the scope of this standard.
---------------------- Page: 11 ----------------------
SIST EN 60079-1:2015
---------------------- Page: 12 ----------------------
SIST EN 60079-1:2015
IEC 60079-1
Edition 7.0 2014-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 1: Equipment protection by flameproof enclosures “d”
Atmosphères explosives –
Partie 1: Protection du matériel par enveloppes antidéflagrantes «d»
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XD
ICS 29.260.20 ISBN 978-2-8322-1663-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 13 ----------------------
SIST EN 60079-1:2015
– 2 – IEC 60079-1:2014 © IEC 2014
CONTENTS

FOREWORD ........................................................................................................................... 8

1 Scope ............................................................................................................................ 16

2 Normative references .................................................................................................... 16

3 Terms and definitions .................................................................................................... 17

4 Level of protection (equipment protection level, EPL) .................................................... 19

4.1 General ................................................................................................................. 19

4.2 Requirements for level of protection “da” .............................................................. 19

4.3 Requirements for level of protection “db” .............................................................. 20

4.4 Requirements for level of protection “dc” ............................................................... 20

4.4.1 General ......................................................................................................... 20

4.4.2 Construction of “dc” devices .......................................................................... 20

4.4.3 Tests for “dc” devices .................................................................................... 20

5 Flameproof joints ........................................................................................................... 21

5.1 General requirements ........................................................................................... 21

5.2 Non-threaded joints .............................................................................................. 22

5.2.1 Width of joints (L) .......................................................................................... 22

5.2.2 Gap (i) ........................................................................................................... 22

5.2.3 Spigot joints................................................................................................... 22

5.2.4 Holes in joint surfaces ................................................................................... 23

5.2.5 Conical joints ................................................................................................. 25

5.2.6 Joints with partial cylindrical surfaces (not permitted for Group IIC) ............... 25

5.2.7 Flanged joints for acetylene atmospheres ...................................................... 26

5.2.8 Serrated joints ............................................................................................... 26

5.2.9 Multi-step joints ............................................................................................. 27

5.3 Threaded joints ..................................................................................................... 30

5.4 Gaskets (including O-rings) ................................................................................... 30

5.5 Equipment using capillaries .................................................................................. 32

6 Sealed joints.................................................................................................................. 32

6.1 Cemented joints .................................................................................................... 32

6.1.1 General ......................................................................................................... 32

6.1.2 Mechanical strength....................................................................................... 32

6.1.3 Width of cemented joints ............................................................................... 33

6.2 Fused glass joints ................................................................................................. 33

6.2.1 General ......................................................................................................... 33

6.2.2 Width of fused glass joints ............................................................................. 33

7 Operating rods ............................................................................................................... 33

8 Supplementary requirements for shafts and bearings..................................................... 34

8.1 Joints of shafts ..................................................................................................... 34

8.1.1 General ......................................................................................................... 34

8.1.2 Cylindrical joints ............................................................................................ 34

8.1.3 Labyrinth joints .............................................................................................. 34

8.1.4 Joints with floating glands .............................................................................. 34

8.2 Bearings ............................................................................................................... 36

8.2.1 Sleeve bearings ............................................................................................. 36

8.2.2 Rolling-element bearings ............................................................................... 36

---------------------- Page: 14 ----------------------
SIST EN 60079-1:2015
IEC 60079-1:2014 © IEC 2014 – 3 –

9 Light-transmitting parts .................................................................................................. 36

10 Breathing and draining devices which form part of a flameproof enclosure .................... 37

10.1 General ................................................................................................................. 37

10.2 Openings for breathing or draining ........................................................................ 37

10.3 Composition limits ................................................................................................. 37

10.4 Dimensions ........................................................................................................... 37

10.5 Elements with measurable paths ........................................................................... 37

10.6 Elements with non-measurable paths .................................................................... 37

10.7 Removable devices ............................................................................................... 38

10.7.1 General ......................................................................................................... 38

10.7.2 Mounting arrangements of the elements ........................................................ 38

10.8 Mechanical strength .............................................................................................. 38

10.9 Breathing devices and draining devices when used as Ex components ................. 38

10.9.1 General ......................................................................................................... 38

10.9.2 Mounting arrangements of the elements and components .............................. 38

10.9.3 Type tests for breathing and draining devices used as Ex components .......... 38

10.9.4 Ex component certificate ............................................................................... 41

11 Fasteners and openings ................................................................................................ 42

12 Materials ....................................................................................................................... 43

13 Entries for flameproof enclosures .................................................................................. 44

13.1 General ................................................................................................................. 44

13.2 Threaded holes ..................................................................................................... 44

13.3 Non-threaded holes (for Group I only) ................................................................... 44

13.4 Cable glands ......................................................................................................... 45

13.5 Conduit sealing devices ........................................................................................ 45

13.6 Plugs and sockets and cable couplers .................................................................. 46

13.7 Bushings ............................................................................................................... 47

13.8 Blanking elements................................................................................................. 47

14 Verification and tests ..................................................................................................... 47

15 Type tests ..............................................................................

...

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