EN 81346-2:2009

SLOVENSKI STANDARD
01-december-2009
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Industrial systems, installations and equipment and industrial products - Structuring
principles and reference designations - Part 2: Classification of objects and codes for
classes (IEC 81346-2:2009)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -
Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von
Objekten und Kennbuchstaben für Klassen (IEC 81346-2:2009)
Systèmes industriels, installations et appareils, et produits industriels - Principes de
structuration et désignations de référence - Partie 2: Classification des objets et codes
pour les classes (CEI 81346-2:2009)
Ta slovenski standard je istoveten z: EN 81346-2:2009
ICS:
01.110 7HKQLþQDGRNXPHQWDFLMD]D Technical product
L]GHONH documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 81346-2
NORME EUROPÉENNE
October 2009
EUROPÄISCHE NORM
ICS 01.110; 29.020 Supersedes EN 61346-2:2000

English version
Industrial systems, installations and equipment and industrial products -
Structuring principles and reference designations -
Part 2: Classification of objects and codes for classes
(IEC 81346-2:2009)
Systèmes industriels, installations  Industrielle Systeme, Anlagen
et appareils, et produits industriels - und Ausrüstungen und Industrieprodukte -
Principes de structuration Strukturierungsprinzipien
et désignations de référence - und Referenzkennzeichnung -
Partie 2: Classification des objets Teil 2: Klassifizierung von Objekten
et codes pour les classes und Kennbuchstaben für Klassen
(CEI 81346-2:2009) (IEC 81346-2:2009)

This European Standard was approved by CENELEC on 2009-08-01. 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 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: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 81346-2:2009 E
Foreword
The text of document 3/945/FDIS, future edition 1 of IEC 81346-2, prepared by IEC TC 3, Information
structures, documentation and graphical symbols, and ISO TC 10, Technical product documentation, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 81346-2 on
2009-08-01.
This European Standard supersedes EN 61346-2:2000.
– all rules concerning the application of letter codes have been removed as these should be included in
another publication dealing with the application of letter codes within reference designations.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2010-05-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2012-08-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 81346-2:2009 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 81346-2:2009
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 81346-1 - Industrial systems, installations and EN 81346-1 2009
equipment and industrial products -
Structuring principles and reference
designations -
Part 1: Basic rules
ISO 14617-6 2002 Graphical symbols for diagrams - - -
Part 6: Measurement and control functions

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

IEC 81346-2
Edition 1.0 2009-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial systems, installations and equipment and industrial products –
Structuring principles and reference designations –
Part 2: Classification of objects and codes for classes

Systèmes industriels, installations et appareils, et produits industriels –
Principes de structuration et désignations de référence –
Partie 2: Classification des objets et codes pour les classes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 01.110; 29.020 ISBN 2-8318-1053-5

– 2 – 81346-2 © IEC:2009
CONTENTS
FOREWORD.4
INTRODUCTION.6
0.1 General.6
0.2 Basic requirements for this standard .6
1 Scope.8
2 Normative references .8
3 Terms and definitions .8
4 Classification principles .8
4.1 General .8
4.2 Assigning objects to classes.9
5 Classes of objects .11
5.1 Classes of objects according to intended purpose or task.11
5.2 Subclasses of objects according to intended purpose or task .17
5.3 Classes of objects according to infrastructure .36
Annex A (informative) Object-classes related to a generic process .39
Annex B (informative) Object-classes related to objects in a generic infrastructure .41

Figure 1 – Constituent objects .7
Figure 2 – The basic concept.8
Figure 3 – Classification of objects in a measuring circuit .10
Figure A.1 – Object-classes related to a process .39
Figure B.1 – Object-classes related to objects in a generic infrastructure.42

Table 1 – Classes of objects according to their intended purpose or task (Codes A to D).12
Table 1 (continued, codes E to J).13
Table 1 (continued, codes K to P) .14
Table 1 (continued, codes Q to U) .15
Table 1 (continued, codes V to Z) .16
Table 2 – Definitions and letter codes of subclasses related to main classes (Class A).18
Table 2 (continued, class B) .19
Table 2 (continued, class C) .20
Table 2 (continued, class E) .21
Table 2 (continued, class F).22
Table 2 (continued, class G) .23
Table 2 (continued, class H) .24
Table 2 (continued, class K) .25
Table 2 (continued, class M) .26
Table 2 (continued, class P) .27
Table 2 (continued, class Q) .28
Table 2 (continued, class R) .29
Table 2 (continued, class S) .30
Table 2 (continued, class T).31

81346-2 © IEC:2009 – 3 –
Table 2 (continued, class U) .32
Table 2 (continued, class V) .33
Table 2 (continued, class W).34
Table 2 (continued, class X) .35
Table 3 – Classes of infrastructure objects .37
Table 4 – Examples of branch-related classes B to U of Table 3 .38

– 4 – 81346-2 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –

Part 2: Classification of objects and codes for classes

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 na
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