SIST EN 61241-17:2005
(Main)Electrical apparatus for use in the presence of combustible dust -- Part 17: Inspection and maintenance of electrical installations in hazardous areas (other than mines)
Electrical apparatus for use in the presence of combustible dust -- Part 17: Inspection and maintenance of electrical installations in hazardous areas (other than mines)
This part of EN 61241 is intended to be applied by users and covers factors directly related to the inspection and maintenance of electrical installations within hazardous areas only. It does not include conventional requirements for electrical installations, nor the testing and certification of electrical apparatus. This standard supplements the requirements laid down in EN 60364-6-61. NOTE: The text is based on EN 60079-17
Elektrische Betriebsmittel zur Verwendung in Bereichen mit brennbarem Staub -- Teil 17: Prüfung und Instandhaltung elektrischer Anlagen in explosionsgefährdeten Bereichen (ausgenommen Grubenbaue)
Matériels électriques pour utilisation en présence de poussières combustibles -- Partie 17: Inspection et maintenance des installations électriques situées en emplacements dangereux (autres que les mines)
La présente partie de la EN 61241 est destinée à être appliquée par les utilisateurs et couvre des facteurs directement reliés à l'inspection et à la maintenance des installations électriques uniquement dans les emplacements dangereux. Elle n'inclut pas les exigences conventionnelles des installations électriques ni les essais et la certification des matériels électriques. La présente norme apporte un supplément aux exigences exprimées dans la EN 60364-6-61. NOTE Le texte est basé sur la EN 60079-17.
Električne naprave za uporabo v prisotnosti gorljivega prahu - 17. del: Pregledovanje in vzdrževanje električnih inštalacij v eksplozijsko ogroženih prostorih (razen v rudnikih) (IEC 61241-17:2005)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61241-17:2005
01-december-2005
1DGRPHãþD
SIST EN 50281-1-2:2000
SIST EN 50281-1-2:2000/A1:2002
(OHNWULþQHQDSUDYH]DXSRUDERYSULVRWQRVWLJRUOMLYHJDSUDKXGHO
3UHJOHGRYDQMHLQY]GUåHYDQMHHOHNWULþQLKLQãWDODFLMYHNVSOR]LMVNRRJURåHQLK
SURVWRULK UD]HQYUXGQLNLK ,(&
Electrical apparatus for use in the presence of combustible dust -- Part 17: Inspection
and maintenance of electrical installations in hazardous areas (other than mines)
Elektrische Betriebsmittel zur Verwendung in Bereichen mit brennbarem Staub -- Teil 17:
Prüfung und Instandhaltung elektrischer Anlagen in explosionsgefährdeten Bereichen
(ausgenommen Grubenbaue)
Matériels électriques pour utilisation en présence de poussières combustibles -- Partie
17: Inspection et maintenance des installations électriques situées en emplacements
dangereux (autres que les mines)
Ta slovenski standard je istoveten z: EN 61241-17:2005
ICS:
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
SIST EN 61241-17:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61241-17:2005
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SIST EN 61241-17:2005
EUROPEAN STANDARD EN 61241-17
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2005
ICS 29.260.20 Partly supersedes EN 50281-1-2:1998 + A1:2002
English version
Electrical apparatus for use in the presence of combustible dust
Part 17: Inspection and maintenance of electrical installations
in hazardous areas (other than mines)
(IEC 61241-17:2005)
Matériels électriques pour utilisation Elektrische Betriebsmittel zur Verwendung
en présence de poussières combustibles in Bereichen mit brennbarem Staub
Partie 17: Inspection et maintenance Teil 17: Prüfung und Instandhaltung
des installations électriques situées elektrischer Anlagen in
en emplacements dangereux explosionsgefährdeten Bereichen
(autres que les mines) (ausgenommen Grubenbaue)
(CEI 61241-17:2005) (IEC 61241-17:2005)
This European Standard was approved by CENELEC on 2005-04-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and 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
© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61241-17:2005 E
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SIST EN 61241-17:2005
EN 61241-17:2005 - 2 -
Foreword
The text of document 31H/191/FDIS, future edition 1 of IEC 61241-17, prepared by SC 31H,
Apparatus for use in the presence of combustible dust, of IEC TC 31, Electrical apparatus for
explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61241-17 on 2005-04-01.
This European Standard, together with EN 61241-1-14:2004, supersedes EN 50281-1-2:1998 +
corrigendum December 1999 + A1:2002.
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) 2006-01-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-04-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61241-17:2005 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 60079-0 NOTE Harmonized as EN 60079-0:2004 (not modified).
IEC 60079-17 NOTE Harmonized as EN 60079-17:2003 (not modified).
IEC 60204-1 NOTE Harmonized as EN 60204-1:1997 (not modified).
IEC 61241-1 NOTE Harmonized as EN 61241-1:2004 (not modified).
IEC 61241-18 NOTE Harmonized as EN 61241-18:2004 (not modified).
__________
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SIST EN 61241-17:2005
- 3 - EN 61241-17:2005
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60079-14 2002 Electrical apparatus for explosive gas EN 60079-14 2003
atmospheres
Part 14: Electrical installations in
hazardous areas (other than mines)
1)
IEC 60364-6-61 - Electrical installations of buildings - -
Part 6-61: Verification - Initial verification
1)
IEC 61241-4 - Electrical apparatus for use in the - -
presence of combustible dust
Part 4: Type of protection 'pD'
1)
2)
IEC 61241-10 - Part 10: Classification of areas where EN 61241-10 2004
combustible dusts are or may be present
3)
IEC 61241-11 - Part 11: Intrinsically safe apparatus 'iD' - -
IEC 61241-14 2004 Part 14: Selection and installation EN 61241-14 2004
1)
Undated reference.
2)
Valid edition at date of issue.
3)
At draft stage.
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SIST EN 61241-17:2005
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SIST EN 61241-17:2005
NORME CEI
INTERNATIONALE IEC
61241-17
INTERNATIONAL
Première édition
STANDARD
First edition
2005-01
Matériels électriques pour utilisation
en présence de poussières combustibles –
Partie 17:
Inspection et maintenance des installations
électriques situées en emplacements dangereux
(autres que les mines)
Electrical apparatus for use in the presence of
combustible dust –
Part 17:
Inspection and maintenance of electrical
installations in hazardous areas (other than mines)
IEC 2005 Droits de reproduction réservés Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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International Electrotechnical Commission
Международная Электротехническая Комиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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61241-17 IEC:2005 – 3 –
CONTENTS
FOREWORD.5
INTRODUCTION.11
1 Scope .13
2 Normative references .13
3 Terms and definitions .15
4 General requirements .19
4.1 Documentation .19
4.2 Qualification of personnel .19
4.3 Inspections.19
4.4 Regular periodic inspections .23
4.5 Continuous supervision by skilled persons .23
4.6 Maintenance requirements.27
4.7 Environmental conditions .29
4.8 Isolation of apparatus .31
4.9 Earthing and equipotential bonding .35
4.10 Conditions of use.35
4.11 Movable apparatus and its connections.35
4.12 Inspection schedules (Tables 1 to 3) .35
5 Additional inspection schedule requirements .37
5.1 Type of protection "iD" – Intrinsic safety (see Table 2 and IEC 61241-11) .37
5.2 Type of protection "pD" – Pressurized enclosure (see Table 3 and
IEC 61241-4).43
5.3 Apparatus used in zone 22 .43
5.4 Types of protection “mD” (encapsulation) .43
6 Typical inspection schedules .45
Annex A (informative) Typical inspection procedure for periodic inspections.51
Bibliography .52
Table 1 – Inspection schedule for Ex "tD" installations .45
Table 2 – Inspection schedule for Ex "iD" installations .47
Table 3 – Inspection schedule for Ex "pD" installations .49
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61241-17 IEC:2005 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICAL APPARATUS FOR USE
IN THE PRESENCE OF COMBUSTIBLE DUST –
Part 17: Inspection and maintenance of electrical installations
in hazardous areas (other than mines)
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 61241-17 has been prepared by subcommittee 31H: Apparatus for
use in the presence of combustible dust, of IEC technical committee 31: Electrical apparatus
for explosive atmospheres.
The text of this standard is based on the following documents:
FDIS Report on voting
31H/191/FDIS 31H/193/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.
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61241-17 IEC:2005 – 7 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61241 consists of the following parts under the general title Electrical apparatus for use in
the presence of combustible dust:
Part 0: General requirements
Part 1: Protection by enclosures ‘tD’
Part 4: Type of protection ‘pD’
Part 10: Classification of areas where combustible dusts are or may be present
1
Part 11: Protection by intrinsic safety ‘iD’
Part 14: Selection and installation
Part 17: Inspection and maintenance of electrical installations in hazardous areas (other
than mines)
Part 18: Protection by encapsulation ‘mD’
2
Part 20: Test methods
Part 20-1: Methods for determining the minimum ignition temperatures of dust
Part 20-2: Method for determining the electrical resistivity of dust in layers
Part 20-3: Method for determining minimum ignition energy of dust/air mixtures
NOTE All references in this standard to the IEC 61241 series follows the proposed re-numbering of the dust
standards agreed by SC31H and TC31. It may be necessary to alter these numbers if the relevant standards are
not yet published.
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.
___________
1
To be published.
2
Under consideration.
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61241-17 IEC:2005 – 9 –
REFERENCE TABLE
Anticipated
New number
Existing standard Subject date of
assigned
change
IEC 61241-0 General requirements 2004
IEC 61241-1-1
IEC 61241-1 Protection by enclosure 2004
IEC 61241-1-2 IEC 61241-14 Selection and installation 2004
IEC 61241-2-1 IEC 61241-20-1 Test methods 2005
IEC 61241-2-2 IEC 61241-20-2 Test methods 2005
IEC 61241-2-3 IEC 61241-20-3 Test methods 2005
IEC 61241-3 IEC 61241-10 Classification 2004
IEC 61241-4 IEC 61241-2 Protection by pressurization 2005
IEC 61241-11 Protection by intrinsic safety 2005
IEC 61241-17 Inspection and maintenance 2004
IEC 61241-18 Protection by encapsulation 2004
IEC 61241-19 Repair and overhaul 2006
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61241-17 IEC:2005 – 11 –
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.
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ELECTRICAL APPARATUS FOR USE
IN THE PRESENCE OF COMBUSTIBLE DUST –
Part 17: Inspection and maintenance of electrical installations
in hazardous areas (other than mines)
1 Scope
This part of IEC 61241 is intended to be applied by users and covers factors directly related
to the inspection and maintenance of electrical installations within hazardous areas only. It
does not include conventional requirements for electrical installations, nor the testing and
certification of electrical apparatus. This standard supplements the requirements laid down in
IEC 60364-6-61.
NOTE The text is based on IEC 60079-17.
This standard assumes effective housekeeping based on a system of cleaning for the plant.
The principles of this standard can also be followed when combustible fibres or flyings may
cause a hazard.
This standard is intended to be applied where there can be a risk due to the presence of
explosive dust/air mixtures 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, or to
• 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 60079-14:2002, Electrical apparatus for explosive gas atmospheres – Part 14: Electrical
installations in hazardous areas (other than mines)
IEC 60364-6-61: Electrical installations of buildings – Part 6-61: Verification – Initial
verification
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
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61241-17 IEC:2005 – 15 –
IEC 61241-11, Electrical apparatus for use in the presence of combustible dust – Part 11:
3
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 following terms and definitions apply.
3.1
explosive atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of gas,
vapour, mist or dust, in which after ignition, combustion spreads throughout the unconsumed
mixture
3.2
explosive dust atmosphere
mixture with air, under atmospheric conditions, of flammable substances in the form of dust,
fibres or flyings in which, after ignition, combustion spreads throughout the unconsumed
mixture
3.3
hazardous area
area in which an explosive atmosphere is present, or may be expected to be present, in
quantities such as to require special precautions for the construction, installation and use of
apparatus
NOTE For the purposes of this standard, an area is a three-dimensional region or space.
3.4
non-hazardous area
area in which an explosive atmosphere is not expected to be present in quantities such as to
require special precautions for the construction, installation and use of apparatus
3.5
maintenance
combination of any actions carried out to retain an item in, or restore it to, conditions in which
it is able to meet the requirements of the relevant specification and perform its required
functions
3.6
inspection
action comprising careful scrutiny of an item carried out either without dismantling, or with the
addition of partial dismantling as required, supplemented by means such as measurement, in
order to arrive at a reliable conclusion as to the condition of an item
3.6.1
visual inspection
inspection which identifies, without the use of access equipment or tools, those defects, such
as missing bolts, which will be apparent to the eye
___________
3
To be published.
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61241-17 IEC:2005 – 17 –
3.6.2
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.
3.6.3
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
3.6.4
initial inspection
inspection of all electrical apparatus, systems and installations before they are brought into
service
3.6.5
periodic inspection
inspection of all electrical apparatus, systems and installations carried out on a routine basis
3.6.6
sample inspection
inspection of a proportion of the electrical apparatus, systems and installations
3.7
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
3.8
skilled personnel
people who meet the requirements for the qualification of personnel in accordance with 4.2
3.9
technical person with executive function
person providing technical management of the skilled personnel, having adequate knowledge
in the field of explosion protection, having familiarity with the local conditions, having
familiarity with the installation and who has overall responsibility and control of the inspection
systems for the electrical equipment within hazardous areas
3.10
associated apparatus
electrical apparatus in which the circuits, or parts of circuits, are not all necessarily
intrinsically safe but which contains circuits that can affect the safety of the intrinsically safe
circuits associated with it
NOTE The associated apparatus is normally the interface between an intrinsically safe circuit and a non-
intrinsically safe circuit and is frequently located in the non-hazardous area. The associated apparatus may be, for
example, shunt diode safety barriers or galvanic isolators.
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4 General requirements
4.1 Documentation
For the purposes of inspection and maintenance, up-to-date documentation of the following
items shall be available:
a) the classification of hazardous areas (see IEC 61241-10) including material characteristics
as electrical resistivity, the minimum ignition temperature of the combustible dust cloud,
minimum ignition temperature of the combustible dust layer and minimum ignition energy
of the combustible dust cloud;
b) apparatus characteristics e.g. temperature ratings, type of protection, IP rating, corrosion
resistance;
c) records sufficient to enable the explosion protected equipment to be maintained in
accordance with its type of protection (see IEC 61241-14) (for example list and location of
apparatus, spares, technical information).
4.2 Qualification of personnel
The inspection and maintenance of installations shall be carried out only by experienced
personnel, whose training has included instruction on the various types of protection and
installation practices, the relevant rules and regulations and on the general principles of area
classification. Appropriate continuing education or training shall be undertaken by personnel
on a regular basis. Evidence of the relevant experience and training claimed shall be
available.
4.3 Inspections
4.3.1 General
Before plant or apparatus is brought into service, it shall be given an initial inspection. To
ensure that the installations are maintained in a satisfactory condition for continued use within
a hazardous area, either
a) regular periodic inspections, or
b) continuous supervision by skilled personnel,
and, where necessary, maintenance shall be carried out.
NOTE 1 Effective housekeeping is assumed.
Following any replacement, repair, modification or adjustment, the items concerned shall be
inspected in accordance with the relevant items of the detailed column of Tables 1, 2 and 3.
If at any time there is a change in the area classification or if any apparatus is moved from
one location to another, a check shall be made to ensure that the type of protection and
surface temperature, where appropriate, are suitable for the revised conditions.
If plant or apparatus is dismantled during the course of an inspection, precautions shall be
taken during reassembly to ensure that the integrity of the type of protection is not impaired,
which includes removing any residual dust and replacing gaskets correctly.
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NOTE 2 The major factors effecting the deterioration of apparatus include: susceptibility to corrosion, exposure to
chemicals or solvents, likelihood of accumulation of dust or dirt, likelihood of water ingress, exposure to excessive
ambient temperature, risk of mechanical damage, exposure to undue vibration, training and experience of
personnel, likelihood of unauthorized modifications or adjustments and likelihood of inappropriate maintenance, for
example that which is not in accordance with the manufacturer's recommendation.
4.3.2 Types of inspection
a) Initial inspections are used to check that the selected type of protection and its installation
are appropriate. They are to be detail inspection graded as shown in Tables 1, 2 and 3, as
appropriate.
NOTE 1 A full initial inspection is not required if an equivalent inspection has been performed by the
manufacturer, and it is unlikely that the installation process will have affected those items inspected by the
manufacturer. For example, an initial detailed inspection of an Ex tD motor is not required; however, the
terminal housing cover which would have been removed to facilitate connection of the field wiring should be
inspected after installation.
b) Periodic inspections may be visual or close as shown in Tables 1, 2 and 3, as appropriate.
A visual or close periodic inspection may lead to the need for a further detailed inspect
...
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