IEC 60079-17:2007

Explosive atmospheres - Part 17: Electrical installations inspection and maintenance

This part of IEC 60079 applies to users and covers factors directly related to the inspection and maintenance of electrical installations within hazardous areas only, where the hazard may be caused by flammable gases, vapours, mists, dusts, fibres or flyings. It does not apply to underground mining areas, areas where a risk can arise due to the presence of hybrid mixtures, dusts of explosives that do not require atmospheric oxygen for combustion, and pyrophoric substances. The significant technical changes with respect to the previous edition are as follows: Additional requirements for inspection and maintenance of electrical installations for combustible dusts and Equipment Protection Levels have been introduced and are explained in the new Annex C.

Atmosphères explosives - Partie 17: Inspection et entretien des installations électriques

La présente partie de la CEI 60079 s'applique aux utilisateurs et couvre les facteurs directement liés à l'inspection et à l'entretien des seules installations électriques situées à l'intérieur des emplacements dangereux, où le risque peut venir des gaz, des vapeurs, des brouillards, des poussières, des fibres ou des particules en suspension inflammables. Elle ne s'applique pas aux parties souterraines des mines, aux emplacements où il existe un danger dû à la présence de mélanges hybrides, aux poussières d'explosif qui n'exigent pas d'oxygène de l'air pour leur combustion, et aux substances pyrophoriques. Les modifications importantes par rapport à l'édition antérieure sont indiquées ci-dessous: Des exigences supplémentaires pour l'inspection et l'entretien d'installations électriques pour les poussières combustibles sont incluses, et Des " niveaux de protection des équipements " ont été introduits et sont expliqués dans la nouvelle Annexe C.

General Information

• Status: Published
• Publication Date: 26-Aug-2007
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: SC 31J - Classification of hazardous areas and installation requirements
• Drafting Committee: MT 60079-17 - TC 31/SC 31J/MT 60079-17
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 19-Nov-2013

Relations

• Replaces: IEC 61241-17:2005 - Electrical apparatus for use in the presence of combustible dust - Part 17: Inspection and maintenance of electrical installations in hazardous areas (other than mines)
• Effective Date: 05-Sep-2023
• Revises: IEC 60079-17:2002 - Electrical apparatus for explosive gas atmospheres - Part 17: Inspection and maintenance of electrical installations in hazardous areas (other than mines)
• Effective Date: 05-Sep-2023
• Revised: IEC 60079-17:2013 - Explosive atmospheres - Part 17: Electrical installations inspection and maintenance
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60079-17
Edition 4.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 17: Electrical installations inspection and maintenance

Atmosphères explosives –
Partie 17: Inspection et entretien des installations électriques

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IEC 60079-17
Edition 4.0 2007-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 17: Electrical installations inspection and maintenance

Atmosphères explosives –
Partie 17: Inspection et entretien des installations électriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
W
CODE PRIX
ICS 29.260.20 ISBN 2-8318-9294-5

– 2 – 60079-17 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 General requirements .10
4.1 Documentation .10
4.2 Qualification of personnel.10
4.3 Inspections.10
4.3.1 General .10
4.3.2 Grades of inspection.11
4.3.3 Types of inspection .11
4.4 Periodic inspections .12
4.4.1 Personnel .12
4.4.2 Fixed installations.12
4.4.3 Moveable equipment .12
4.5 Continuous supervision by skilled personnel .13
4.5.1 Concept.13
4.5.2 Objectives .13
4.5.3 Responsibilities .13
4.5.4 Frequency of inspection.14
4.5.5 Documents .14
4.5.6 Training .14
4.6 Maintenance requirements .15
4.6.1 Remedial measures and alterations to equipment.15
4.6.2 Maintenance of flexible cables.15
4.6.3 Withdrawal from service .15
4.6.4 Fastenings and tools .15
4.7 Environmental conditions .16
4.8 Isolation of equipment .16
4.8.1 Installations other than intrinsically safe circuits .16
4.8.2 Intrinsically safe installations .17
4.9 Earthing and equipotential bonding .18
4.10 Specific conditions of use.18
4.11 Movable equipment and its connections .18
4.12 Inspection schedules (Tables 1 to 4) .18
4.12.1 Equipment is appropriate to the EPL/zone requirements of the
location .18
4.12.2 Equipment group is correct.18
4.12.3 Equipment maximum surface temperature is correct.18
4.12.4 Equipment circuit identification .18
4.12.5 Cable gland .19
4.12.6 Type of cable is appropriate .19
4.12.7 Sealing .19
4.12.8 Fault loop impedance or earthing resistance.19

60079-17 © IEC:2007 – 3 –
4.12.9 Insulation resistance.19
4.12.10 Overload protection .19
5 Additional inspection schedule requirements .19
5.1 Type of protection "d" – Flameproof enclosure (see Table 1 and IEC 60079-1).19
5.1.1 Flameproof joints (see IEC 60079-1) .19
5.2 Type of protection "e" – Increased safety (see Table 1 and IEC 60079-7).20
5.2.1 Overloads.20
5.3 Type of protection "i" and "iD" – Intrinsic safety (see Table 2 and IEC 60079-11
or IEC 61241-11).20
5.3.1 General .20
5.3.2 Documentation .20
5.3.3 Labelling.20
5.3.4 Unauthorized modifications.21
5.3.5 Associated apparatus (safety interface) between intrinsically safe
and non-intrinsically safe circuits .21
5.3.6 Cables.21
5.3.7 Cable screens .21
5.3.8 Point-to-point connections .21
5.3.9 Earth continuity of non-galvanically isolated circuits .21
5.3.10 Earth connections to maintain the integrity of the intrinsic safety .21
5.3.11 Intrinsically safe circuit earthing and/or insulation.22
5.3.12 Separation between intrinsically safe and non-intrinsically safe
circuits.22
5.4 Type of protection "p" and "pD" – Pressurized enclosure (see Table 3 and
IEC 60079-2 or IEC 61241-4) .22
5.5 Type of protection "n" (see Table 1 or 2 and IEC 60079-15) .22
5.5.1 General .22
5.5.2 Restricted breathing enclosures .22
5.6 Type of protection "tD" – Protection by enclosure (see Table 4 and
IEC 61241-1).22
5.7 Types of protection "m" and "mD" (encapsulation), "o" (oil-immersion) and
"q" (powder-filling).22
6 Inspection schedules .23

Annex A (informative) Typical inspection procedure for periodic inspections .28
Annex B (normative) Knowledge, skills and competencies of "responsible persons",
"technical persons with executive function" and "operatives".29
Annex C (informative) Introduction of an alternative risk assessment method
encompassing “equipment protection levels” for Ex equipment .31

Bibliography.36

Table 1 – Inspection schedule for Ex "d", Ex "e" and Ex "n" installations (D = Detailed,
C = Close, V = Visual) .23
Table 2 – Inspection schedule for Ex "i", "iD" and "nL" installa
...