SIST EN 60079-17:2008

SLOVENSKI STANDARD
SIST EN 60079-17:2008
01-januar-2008
1DGRPHãþD
SIST EN 60079-17:2003
SIST EN 61241-17:2005
(NVSOR]LYQHDWPRVIHUHGHO3UHJOHGRYDQMHLQY]GUåHYDQMHHOHNWULþQLKLQãWDODFLM
,(&
Explosive atmospheres -- Part 17: Electrical installations inspection and maintenance
Explosionsfähige Atmosphäre - Teil 17: Prüfung und Instandhaltung elektrischer Anlagen
Atmosphères explosives -- Partie 17: Inspection et entretien des installations électriques
Ta slovenski standard je istoveten z: EN 60079-17:2007
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
SIST EN 60079-17:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 60079-17:2008

---------------------- Page: 2 ----------------------

SIST EN 60079-17:2008


EUROPEAN STANDARD
EN 60079-17
NORME EUROPÉENNE
September 2007
EUROPÄISCHE NORM

ICS 29.260.20 Supersedes EN 60079-17:2003 and EN 61241-17:2005
Incorporates corrigendum July 2008


English version


Explosive atmospheres -
Part 17: Electrical installations inspection and maintenance
(IEC 60079-17:2007)


Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 17: Inspection et entretien Teil 17: Prüfung und Instandhaltung
des installations électriques elektrischer Anlagen
(CEI 60079-17:2007) (IEC 60079-17:2007)




This European Standard was approved by CENELEC on 2007-09-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

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

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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-17:2007 E

---------------------- Page: 3 ----------------------

SIST EN 60079-17:2008
EN 60079-17:2007 - 2 -
Foreword
The text of document 31J/145/FDIS, future edition 4 of IEC 60079-17, 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 was approved by CENELEC as EN 60079-17 on
2007-09-01.
This European Standard supersedes EN 60079-17:2003 and 61241-17:2005.
The significant technical changes with respect to EN 60079-17:2003 are as follows:
– additional requirements for inspection and maintenance of electrical installations for combustible dusts
are included;
– knowledge, skills and competencies of "responsible persons", "technical persons with executive
function" and "operatives" are explained in new Annex B;
– Equipment Protection Levels (EPLs) have been introduced and are explained in the new Annex C.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-09-01
Annex ZA has been added by CENELEC.
The contents of the corrigendum of July 2008 have been included in this copy.
__________
Endorsement notice
The text of the International Standard IEC 60079-17:2007 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 60079-6 NOTE  Harmonized as EN 60079-6:2007 (not modified).
IEC 60079-7 NOTE  Harmonized as EN 60079-7:2007 (not modified).
IEC 60079-18 NOTE  Harmonized as EN 60079-18:2004 (not modified).
IEC 60079-26 NOTE  Harmonized as EN 60079-26:2007 (not modified).
IEC 60079-28 NOTE  Harmonized as EN 60079-28:2007 (not modified).
IEC 60204-1 NOTE  Harmonized as EN 60204-1:2006 (modified).
__________

---------------------- Page: 4 ----------------------

SIST EN 60079-17:2008
- 3 - EN 60079-17:2007
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. 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

1) 2)
IEC 60079-0 (mod) - Electrical apparatus for explosive gas EN 60079-0 2006
atmospheres -
Part 0: General requirements


1) 2)
IEC 60079-1 - Explosive atmospheres - EN 60079-1 2007
Part 1: Equipment protection by flameproof
enclosures "d"


1)
IEC 60079-2 - Explosive atmospheres - - -
Part 2: Equipment protection by pressurized
enclosure "p"


1) 2)
IEC 60079-7 - Explosive atmospheres - EN 60079-7 2007
Part 7: Equipment protection by Increased
safety "e"


1) 2)
IEC 60079-10 - Electrical apparatus for explosive gas EN 60079-10 2003
atmospheres -
Part 10: Classification of hazardous areas


1) 2)
IEC 60079-11 - Explosive atmospheres - EN 60079-11 2007
Part 11: Equipment protection by intrinsic
safety "i"


1) 2)
IEC 60079-14 - Electrical apparatus for explosive gas EN 60079-14 2003
atmospheres -
Part 14: Electrical installations in hazardous
areas (other than mines)


1) 2)
IEC 60079-15 - Electrical apparatus for explosive gas EN 60079-15 2005
atmospheres -
Part 15: Construction, test and marking of
type of protection "n" electrical apparatus


1) 2)
IEC 60079-19 - Explosive atmospheres - EN 60079-19 2007
Part 19: Equipment repair, overhaul and
reclamation


1) 2)
IEC 60364-6 (mod) - Low voltage electrical installations - HD 60364-6 2007
Part 6: Verification


IEC 61241 Series Electrical apparatus for use EN 61241 Series
in the presence of combustible dust


1) 2)
IEC 61241-1 - Electrical apparatus for use EN 61241-1 2004
in the presence of combustible dust - + corr. December 2006
Part 1: Protection by enclosures "tD"



1)
Undated reference.
2)
Valid edition at date of issue.

---------------------- Page: 5 ----------------------

SIST EN 60079-17:2008
EN 60079-17:2007 - 4 -
Publication Year Title EN/HD Year
1) 2)
IEC 61241-4 - Electrical apparatus for use EN 61241-4 2006
in the presence of combustible dust -
Part 4: Type of protection "pD"


1) 2)
IEC 61241-10 - Electrical apparatus for use EN 61241-10 2004
in the presence of combustible dust -
Part 10: Classification of areas where
combustible dusts are or may be present


1) 2)
IEC 61241-11 - Electrical apparatus for use EN 61241-11 2006
in the presence of combustible dust -
Part 11: Protection by intrinsic safety "iD"


IEC 61241-14 2004 Electrical apparatus for use EN 61241-14 2004
in the presence of combustible dust -
Part 14: Selection and installation

---------------------- Page: 6 ----------------------

SIST EN 60079-17:2008
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

---------------------- Page: 7 ----------------------

SIST EN 60079-17:2008
– 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

---------------------- Page: 8 ----------------------

SIST EN 60079-17:2008
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" installations.25
Table 3 – Inspection schedule for Ex "p" and "pD" installations.26
Table 4 – Inspection schedule for Ex "tD" installations .27
Table C.1 – Traditional relationship of EPLs to zones (no additional risk assessment) .33
Table C.2 – Description of risk of ignition protection provided .34

---------------------- Page: 9 ----------------------

SIST EN 60079-17:2008
– 4 – 60079-17 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

EXPLOSIVE ATMOSPHERES –

Part 17: Electrical installations inspection and maintenance


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
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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 60079-17 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 2002 and constitutes a
technical revision.
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 are included.
• Knowledge, skills and competencies of "responsible persons", "technical persons with
executive function" and "operatives" are explained in new Annex B.
• Equipment Protection Levels (EPLs) have been introduced and are explained in the new
Annex C.

---------------------- Page: 10 ----------------------

SIST EN 60079-17:2008
60079-17 © IEC:2007 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
31J/145/FDIS 31J/148/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60079 series, under the general title Explosive atmospheres, can
be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

---------------------- Page: 11 ----------------------

SIST EN 60079-17:2008
– 6 – 60079-17 © IEC:2007
INTRODUCTION
Electrical installations in hazardous areas possess features specially designed to render them
suitable for operations in such atmospheres. It is essential for reasons of safety in those
areas that, throughout the life of such installations, the integrity of those special features is
preserved; they therefore require initial inspection and either
a) regular periodic inspections thereafter, or
b) continuous supervision by skilled personnel
in accordance with this standard and, when necessary, maintenance.
NOTE Correct functional operation of hazardous area installations does not mean, and should not be interpreted
as meaning, that the integrity of the special features referred to above is preserved.

---------------------- Page: 12 ----------------------

SIST EN 60079-17:2008
60079-17 © IEC:2007 – 7 –
EXPLOSIVE ATMOSPHERES –

Part 17: Electrical installations inspection and maintenance



1 Scope
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 include:
• other fundamental installation and inspection requirements for electrical installations;
• the verification of electrical equipment;
• the repair and reclamation of explosion protected equipment (see IEC 60079-19).
This standard supplements the requirements of IEC 60364-6.
In the case of dusts, fibres or flyings  the level of housekeeping may influence the inspection
and maintenance requirements.
This standard is intended to be applied where there can be a risk due to the presence of
explosive gas or dust mixtures with air or combustible dust layers under normal atmospheric
conditions. 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,
• pyrophoric substances.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-1, Explosive atmospheres – Part 1: Equipment protection by flameproof enclosures
"d"
IEC 60079-2, Explosive atmospheres – Part 2: Equipment protection by pressurized
enclosures "p"
IEC 60079-7, Explosive atmospheres – Part 7: Equipment protection by increased safety “e”
IEC 60079-10, Electrical apparatus for explosive gas atmospheres – Part 10: Classification of
hazardous areas
IEC 60079-11, Explosive atmospheres – Part 11: Equipment protection by intrinsic safety "i"

---------------------- Page: 13 ----------------------

SIST EN 60079-17:2008
– 8 – 60079-17 © IEC:2007
IEC 60079-14, Electrical apparatus for explosive gas atmospheres – Part 14: Electrical
installations in hazardous areas (other than mines)
IEC 60079-15, Electrical apparatus for explosive gas atmospheres – Part 15: Construction,
test and marking of type of protection "n" electrical apparatus
IEC 60079-19, Explosive atmospheres – Part 19:Equipment repair, overhaul and reclamation
IEC 60364-6, Low-voltage electrical installations – Part 6: Verification
IEC 61241 (all parts), Combustible dust
IEC 61241-1, Electrical apparatus for use in the presence of combustible dust – Part
1:Protection by enclosures “tD”
IEC 61241-4, Electrical apparatus for use in the presence of combustible dust – Part 4: Type
of protection “pD”
IEC 61241-10, Electrical apparatus for use in the presence of combustible dust – Part 10:
Classification of areas where combustible dusts are or may be present
IEC 61241-11, Electrical apparatus for use in the presence of combustible dust – Part 11:
Protection by intrinsic safety “iD”
IEC 61241-14:2004, Electrical apparatus for use in the presence of combustible dust –
Part 14: Selection and installation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60079-0 and the
following apply.
NOTE Additional definitions applicable to explosive atmospheres can be found in Chapter 426 of the International
Electrotechnical Vocabulary (IEV) IEC 60050 (426).

3.1
close inspection
inspection which encompasses those aspects covered by a visual inspection and, in addition,
identifies those defects, such as loose bolts, which will be apparent only by the use of access
equipment, for example steps, (where necessary), and tools
NOTE Close inspections do not normally require the enclosure to be opened, or the equipment to be de-
energized.
3.2
continuous supervision
frequent attendance, inspection, service, care and maintenance of the electrical installation by
skilled personnel who have experience in the specific installation and its environment in order
to maintain the explosion protection features of the installation in satisfactory condition
3.3
detailed inspection
inspection which encompasses those aspects covered by a close inspection and, in addition,
identifies those defects, such as loose terminations, which will only be apparent by opening
the enclosure, and/or using, where necessary, tools and test equipment

---------------------- Page: 14 ----------------------

SIST EN 60079-17:2008
60079-17 © IEC:2007 – 9 –
3.4
hazardous area
area in which an explosive atmosphere is present, or may be expected to be present, in
quantities such as to req
...