IEC 60079-19:2019

IEC 60079-19 ®
Edition 4.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 19: Equipment repair, overhaul and reclamation

Atmosphères explosives –
Partie 19: Réparation, révision et remise en état de l’appareil

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IEC 60079-19 ®
Edition 4.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 19: Equipment repair, overhaul and reclamation

Atmosphères explosives –
Partie 19: Réparation, révision et remise en état de l’appareil

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-7527-6

– 2 – IEC 60079-19:2019  IEC 2019
CONTENTS
FOREWORD . 8
INTRODUCTION . 13
1 Scope . 14
2 Normative references . 14
3 Terms and definitions . 15
4 General . 20
4.1 General principles . 20
4.2 Instructions for the user . 20
4.2.1 Ex Equipment Certificates and schedule drawings . 20
4.2.2 Records and work instructions . 21
4.2.3 Re-installation of repaired equipment. 21
4.2.4 Service facilities . 21
4.3 Instructions for the service facility . 21
4.3.1 Statutory requirements . 21
4.3.2 Repair and overhaul . 21
4.3.3 Reclamations . 26
4.3.4 Alterations and modifications . 29
4.3.5 Temporary repairs . 30
4.3.6 Electric machines . 30
4.3.7 Control equipment . 32
5 Additional requirements for the repair and overhaul of equipment with Type of
Protection "d" . 32
5.1 Application . 32
5.2 Repair and overhaul . 33
5.2.1 Enclosures . 33
5.2.2 Water jackets . 34
5.2.3 Entries into enclosures . 34
5.2.4 Terminations . 34
5.2.5 Insulation . 34
5.2.6 Internal connections . 34
5.2.7 Electric machines . 34
5.2.8 Auxiliary equipment . 35
5.3 Reclamation . 36
5.3.1 General . 36
5.3.2 Enclosures . 36
5.3.3 Sleeving . 38
5.3.4 Shafts and housings . 38
5.3.5 Sleeve bearings . 38
5.3.6 Rotors and stators . 38
5.4 Alterations and modifications . 38
5.4.1 Enclosures . 38
5.4.2 Entries into enclosures . 38
5.4.3 Terminations . 39
5.4.4 Windings . 39
5.4.5 Auxiliary equipment . 39

6 Additional requirements for the repair and overhaul of equipment with Type of
Protection "i" . 39
6.1 Application . 39
6.2 Repair and overhaul . 40
6.2.1 Enclosures . 40
6.2.2 Cable glands . 40
6.2.3 Terminations . 40
6.2.4 Soldered connections . 40
6.2.5 Fuses . 41
6.2.6 Relays . 41
6.2.7 Shunt diode safety barriers and galvanic isolators . 41
6.2.8 Printed circuit boards . 41
6.2.9 Optocouplers and piezoelectric components . 42
6.2.10 Electrical components . 42
6.2.11 Batteries . 42
6.2.12 Internal wiring . 42
6.2.13 Transformers . 43
6.2.14 Encapsulated components . 43
6.2.15 Non-electrical parts . 43
6.2.16 Testing . 43
6.3 Reclamation . 43
6.4 Modifications. 43
7 Additional requirements for the repair and overhaul of equipment with Type of
Protection "p" . 43
7.1 Application . 43
7.2 Repair and overhaul . 44
7.2.1 Enclosures . 44
7.2.2 Entries into enclosures . 44
7.2.3 Terminations . 44
7.2.4 Insulation . 44
7.2.5 Internal connections . 44
7.2.6 Electric machines . 45
7.2.7 Auxiliary devices . 46
7.2.8 Light-transmitting parts . 46
7.2.9 Encapsulated parts . 46
7.2.10 Batteries . 46
7.2.11 Lamps . 46
7.2.12 Lampholders . 46
7.2.13 Ballasts . 46
7.3 Reclamation . 46
7.3.1 General . 46
7.3.2 Enclosures . 46
7.3.3 Shafts and housings . 47
7.3.4 Sleeve bearings . 47
7.3.5 Rotors and stators . 47
7.4 Alterations and modifications . 47
7.4.1 Enclosures . 47
7.4.2 Entries into enclosures . 47
7.4.3 Terminations . 47

– 4 – IEC 60079-19:2019  IEC 2019
7.4.4 Windings . 48
7.4.5 Auxiliary equipment . 48
7.5 Pressurization system . 48
8 Additional requirements for the repair and overhaul of equipment with Type of
Protection "e" . 48
8.1 Application . 48
8.2 Repair and overhaul . 49
8.2.1 Enclosures . 49
8.2.2 Entries into enclosures . 49
8.2.3 Terminations . 49
8.2.4 Insulation . 49
8.2.5 Internal connections . 49
8.2.6 Electric machines . 50
8.2.7 Light-transmitting parts . 52
8.2.8 Encapsulated parts . 52
8.2.9 Batteries . 53
8.2.10 Lamps . 53
8.2.11 Lampholders . 53
8.2.12 Ballasts . 53
8.2.13 Breathing devices . 53
8.3 Reclamation . 53
8.3.1 General . 53
8.3.2 Enclosures . 53
8.3.3 Sleeve bearings . 54
8.3.4 Rotors and stators . 54
8.4 Alterations and modifications . 54
8.4.1 Enclosures . 54
8.4.2 Entries into enclosures . 54
8.4.3 Terminations . 54
8.4.4 Windings . 54
8.4.5 Auxiliary equipment . 55
9 Additional requirements for the repair and overhaul of equipment with Type of
Protection "n" . 55
9.1 Application . 55
9.2 Repair and overhaul . 55
9.2.1 Enclosures . 55
9.2.2 Entries into enclosures . 55
9.2.3 Terminations . 56
9.2.4 Insulation . 56
9.2.5 Internal connections . 56
9.2.6 Electric machines . 56
9.2.7 Light-transmitting parts . 58
9.2.8 Encapsulated parts . 58
9.2.9 Batteries . 59
9.2.10 Lamps . 59
9.2.11 Lampholders . 59
9.2.12 Ballasts . 59
9.2.13 Enclosed break devices . 59
9.2.14 Breathing devices . 59

9.3 Reclamation . 59
9.3.1 General . 59
9.3.2 Enclosures . 59
9.3.3 Joints . 59
9.3.4 Shafts and housings . 60
9.3.5 Sleeve bearings . 60
9.3.6 Rotors and stators . 60
9.4 Alterations and modifications . 60
9.4.1 Enclosures . 60
9.4.2 Entries into enclosures . 60
9.4.3 Terminations . 60
9.4.4 Windings . 60
9.4.5 Auxiliary equipment . 61
10 Additional requirements for the repair and overhaul of equipment covered by
IEC 60079-26 . 61
11 Additional requirements for the repair and overhaul of equipment with Type of
Protection “t” (formerly “tD” or DIP) . 61
11.1 Application . 61
11.2 Repair and overhaul . 61
11.2.1 Enclosures . 61
11.2.2 Entries into enclosures . 62
11.2.3 Terminations . 62
11.2.4 Insulation . 62
11.2.5 Internal connections . 62
11.2.6 Electric machines . 62
11.2.7 Light-transmitting parts . 63
11.2.8 Batteries . 63
11.2.9 Lamps . 63
11.2.10 Lamp holders . 64
11.2.11 Ballasts . 64
11.2.12 Breathing devices . 64
11.3 Reclamation . 64
11.3.1 General . 64
11.3.2 Enclosures . 64
11.3.3 Joints . 64
11.3.4 Shafts and housings . 64
11.3.5 Sleeve bearings . 65
11.3.6 Rotors and stators . 65
11.4 Alterations and modifications . 65
11.4.1 Enclosures . 65
11.4.2 Entries into enclosures . 65
11.4.3 Windings . 65
11.4.4 Auxiliary equipment . 65
12 Requirements for the repair and overhaul of equipment with Type of
Protection ”o”. 65
12.1 Application . 65
12.2 Repair and overhaul . 66
12.2.1 Associated Types of Protection . 66
12.2.2 Removal of protective liquid . 66

– 6 – IEC 60079-19:2019  IEC 2019
12.2.3 Replacement of components . 66
12.2.4 Preparation for replacing protective liquid . 66
12.2.5 Protective liquid . 66
12.2.6 Closure of container . 66
12.3 Reclamation . 66
12.4 Modifications. 67
13 Requirements for the repair and overhaul of equipment with Type of Protection “q” . 67
13.1 Application . 67
13.2 Repair and overhaul . 67
13.2.1 Associated Types of Protection . 67
13.2.2 Removal of protective materials . 67
13.2.3 Replacement of components . 67
13.2.4 Preparation for replacing protective materials . 67
13.2.5 Protective materials . 67
13.2.6 Closure of container . 67
13.3 Reclamation . 68
13.4 Modifications. 68
14 Requirements for the repair and overhaul of equipment with Type of Protection “s” . 68
15 Electrical resistance trace heating . 68
Annex A (normative) Identification of repaired equipment by marking . 69
A.1 Marking information . 69
A.2 Symbols . 69
A.2.1 Repair in accordance with schedule drawings or manufacturer’s
specification . 69
A.2.2 Repair in accordance with the Type of Protection standards but not the
schedule drawings . 69
A.2.3 Other situations . 70
Annex B (normative) Knowledge, skills and competence of responsible persons and
operatives . 71
B.1 General . 71
B.2 Knowledge and skills . 71
B.2.1 Responsible persons . 71
B.2.2 Operatives . 71
B.3 Competence . 71
B.3.1 General . 71
B.3.2 Responsible persons . 72
B.3.3 Operatives . 72
B.4 Assessment . 72
B.5 Qualification of reclamation operatives . 72
Annex C (normative) Requirements for measurements in flameproof equipment during
overhaul, repair and reclamation (including guidance on tolerances) . 73
Annex D (informative) Evaluation of best practice during rewinding and repair . 76
Annex E (informative) Additional requirements relating to Ex control equipment . 77
E.1 General . 77
E.2 Common items . 77
E.3 Isolators and circuit interrupters . 77
E.4 Interlocks and mechanical linkages . 78
E.5 Earth fault devices . 78
E.6 Other devices . 78

E.7 Transformers . 78
Bibliography . 80

Figure A.1 – Repair in accordance with IEC 60079-19 and schedule drawings or
manufacturer's specification . 69
Figure A.2 – Repair in accordance with the Type of Protection standards but with
insufficient evidence of full compliance with the schedule drawings . 70
Figure C.1 – Determination of maximum gap of reclaimed parts . 75

Table C.1 – Determination of maximum gap of reclaimed parts . 73

– 8 – IEC 60079-19:2019  IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 19: Equipment repair, overhaul and reclamation

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60079-19 has been prepared by subcommittee 31J: Classification
of hazardous areas and installation requirements, of IEC technical committee 31: Equipment
for explosive atmospheres.
This fourth edition cancels and replaces the third edition published in 2010 together with
Amendment 1:2015. This edition constitutes a technical revision.
The significance of the changes between IEC 60079-19, Edition 3 (2010), including
Amendment 1 (2015), and IEC 60079-19, Edition 4 (2019) are as listed below:

Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
Relationship between IEC 60034-23 and IEC 60079-19 Introduction X
Document applicable to Type(s) of Protection “o” and “q” 1 X
Standard for electrical resistance trace heating added 2 X
Terms “repair facility” and “service facility” are considered
3 to 15 X
equivalent. Changed “repair facility” to “service facility”
Terms and definitions aligned alphabetically 3 X
Clarification of definition “certificate” 3.2 X
Addition of definition “Component Certificate” 3.2.1 X
Addition of definition “Ex Equipment Certificate” 3.2.2 X
Addition of definition “schedule drawing” 3.2.3 X
Change in terms used from “certificate documents” to 4
X
“schedule drawing”
Annex E
Change in terms used from “certificate documents” to “Ex
4.2.1 X
Equipment Certificates” and “schedule drawings”
Change in terms used from “motor”, “rotating machine”,
All X
“rotating electrical machine” to “electric machine”
Addition of specific operating requirements 4.3.2.1 X
Clarification of requirements for repair of components 4.3.2.3 X
Addition of a requirement to review “X” conditions 4.3.2.4.2 X
Change in terms from “bolt” to “fastener" 4.3.2.5.2 X
Addition of bullet point for marking of repairs to certification
4.3.2.6 a) X
documentation
Addition of bullet point for fitness for purpose assessment to
4.3.2.6 e) X
IEC 60079-17
Additional actions to be taken in case of uncertainty of a
4.3.3.1 X
reclamation
Change of “subject to repair” to “repairable" 4.3.3.2 X
Elimination of duplication of requirements 4.3.3.3.1 X
Addition of bullet point including other welding techniques to
4.3.3.4.5 X
ISO 4063
Addition of requirement for threaded hole verification using
4.3.3.4.7 X
GO, NO-GO gauges and threaded hole reclamation test
The role of a service facility clarified to exclude the role of a
4.3.4.1 X
manufacturer when making alterations
Addition of requirement that the Ex report following
equipment modification shall not have an attestation of 4.3.4.2 X
compliance
Clarification of repairer’s duty to confirm service condition
4.3.6.2 X
following any reclamation
Restructuring of requirements relating to testing of electric 4.3.6.3.1
machines as subclauses of 4.3.6 from Type of Protection and X
clauses 5, 7, 8, 9, 10 and 11 in previous editions. 4.3.6.3.2
Addition of a requirement for greases with non-evaporating
5.2.1.1 X
solvents for joint corrosion protection materials
Revised a recommendation to a requirement “should” to
5.2.4 X
“shall”
Revised a recommendation to a requirement. ”is necessary”
5.2.7.2 X
to “shall be taken”
Text amended to make requirement clearer 5.2.8.1 X

– 10 – IEC 60079-19:2019  IEC 2019
Type
Explanation of the significance of the changes Clause Minor and Extension Major
editorial technical
changes changes
Addition of requirement for threaded hole verification using
5.3.2.3 X
GO, NO-GO gauge and threaded hole reclamation tests
Addition of requirements for Type of Protection “i” requiring
repair to manufacturer’s documentation and certificate
requirements only
6.1  C1
Repair of multilayer boards or any board with surface
mounted devices are excluded
Addition of “thermal property” requirement for terminations 6.2.3 X
Change in text of requirements for soldered connections 6.2.4 X
Revised a recommendation to a requirement for fuses,
6.2.5 X
“inappropriate” to “not permitted”
Addition of requirement for printed circuit board repair 6.2.8 X
Change in text of requirement for electrical components
replacing “certification” by “assessment by a suitable 6.2.10 X
competent person”
Elimination of duplication of text 6.2.11 X
Change in text for internal wiring replacing “certification” by
6.2.12 X
“assessment by a suitable competent person”
Addition of Type(s) of Protection marks with Explosion
7 X
Protection Levels
Addition of new subclause detailing requirements for
7.5 X
verification of pressurization system
Addition of “Level of Protection” to clarify “eb” 8 X
Change in requirements for copy winding as introduced in
8.2.6.1.2 X
IEC 60079-19:2010/AMD 1:2015
Elimination of duplication of note and text and correction of
8.2.6.1.2
bullet point letters
Change in text to clarify the requirements for windings with
8.2.6.1.3 X
voltage > 1 000 V
Change in text to clarify the requirements relating to “light
8.2.7 X
transmitting parts”
A
...