Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classes

IEC 81346-2:2019 establishes classification schemes with defined object classes and their associated letter codes, and is primarily intended for use in reference designations and for designation of generic types. The classification schemes are applicable for objects in all technical disciplines and all branches of industry. IEC 81346-2:2019 is a horizontal publication also intended for for use by technical committees in preparation of publications related to reference designations in accordance with the principles laid down in IEC Guide 108. IEC 81346-2:2019 cancels and replaces the first edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) The entry classes of the classification scheme have been defined to reflect the “inherent function” of the object classified; b) The classes are defined to align with the principles of ISO 22274 and ISO 704; c) A three-level classification scheme has been defined, which provides a greater flexibility for the designer in some technical fields; d) Classes are defined by their definition and provided with a preferred term. Examples are provided if needed; e) A separate classification scheme for spaces has been provided.

Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von Objekten und Kennbuchstaben für Klassen

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

IEC 81346-2:2019 établit des plans de classification et définit les classes d’objets ainsi que leurs lettres codes associées, et est principalement destinée à un usage dans les désignations de référence et pour la désignation des types génériques. Les plans de classification s’appliquent aux objets appartenant à toutes les disciplines techniques ainsi qu’à toutes les branches d'industrie. IEC 81346-2:2019 est une publication horizontale également destinée à être utilisée par les comités d’études pour l’établissement de publications liées aux désignations de référence conformément aux principes exposés dans le Guide IEC 108. IEC 81346-2:2019 annule et remplace la première édition parue en 2009. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) Les classes d’entrée du plan de classification ont été définies afin de refléter la «fonction intrinsèque» de l’objet classé; b) Les classes sont définies de sorte à s’aligner sur les principes définis dans l’ISO 22274 et l’ISO 704; c) Un plan de classification à trois niveaux a été défini afin de garantir au concepteur une plus grande latitude dans certains domaines techniques; d) Les classes sont définies avec un terme préférentiel. Des exemples sont fournis, si nécessaire; e) Un plan de classification distinct a été fourni pour les espaces.

Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela strukturiranja in referenčne oznake - 2. del: Razvrščanje objektov v razrede in njihove kode (IEC 81346-2:2019)

Ta standard vzpostavlja sheme razvrščanja z definiranimi razredi predmetov in pripadajočimi kodami ter je namenjen predvsem za uporabo v referenčnih poimenovanjih in za poimenovanje generičnih vrst. Sheme razvrščanja se uporabljajo za predmete v vseh tehničnih disciplinah in vseh panogah industrije. Dokument je horizontalna publikacija, namenjena tudi tehničnim odborom za pripravo publikacij, povezanih z referenčnimi oznakami v skladu z načeli vodila IEC 108.

General Information

Status
Published
Publication Date
29-Aug-2019
Current Stage
6060 - Document made available
Due Date
21-Mar-2019

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SLOVENSKI STANDARD
SIST EN IEC 81346-2:2019
01-november-2019
Nadomešča:
SIST EN 81346-2:2009
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela
strukturiranja in referenčne oznake - 2. del: Razvrščanje objektov v razrede in
njihove kode (IEC 81346-2:2019)

Industrial systems, installations and equipment and industrial products - Structuring

principles and reference designations - Part 2: Classification of objects and codes for

classes (IEC 81346-2:2019)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -

Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von

Objekten und Kennbuchstaben für Klassen (IEC 81346-2:2019)

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 (IEC 81346-2:2019)
Ta slovenski standard je istoveten z: EN IEC 81346-2:2019
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN IEC 81346-2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 81346-2:2019
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SIST EN IEC 81346-2:2019
EUROPEAN STANDARD EN IEC 81346-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 01.110; 29.020 Supersedes EN 81346-2:2009 and all of its amendments
and corrigenda (if any)
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 81346-2:2019)

Systèmes industriels, installations et appareils, et produits Industrielle Systeme, Anlagen und Ausrüstungen und

industriels - Principes de structuration et désignations de Industrieprodukte - Strukturierungsprinzipien und

référence - Partie 2: Classification des objets et codes pour Referenzkennzeichnung - Teil 2: Klassifizierung von

les classes Objekten und Kennbuchstaben für Klassen
(IEC 81346-2:2019) (IEC 81346-2:2019)

This European Standard was approved by CENELEC on 2019-07-23. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 81346-2:2019 E
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SIST EN IEC 81346-2:2019
EN IEC 81346-2:2019 (E)
European foreword

The text of document 3/1393/FDIS, future edition 2 of IEC 81346-2, prepared by IEC/TC 3

"Information structures and elements, identification and marking principles, documentation and

graphical symbols" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN IEC 81346-2:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-04-23

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-07-23

document have to be withdrawn

This document supersedes EN 81346-2:2009 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 81346-2:2019 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 60898 (series) NOTE Harmonized as EN 60898 (series)
Harmonized as EN ISO 12006-2 (not
ISO 12006-2:2015 NOTE
modified)
Under preparation. Stage at the time of publication: prEN ISO 12006-2:2019.
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SIST EN IEC 81346-2:2019
EN IEC 81346-2:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 81346-1 2009 Industrial systems, installations and EN 81346-1 2009
equipment and industrial products -
Structuring principles and reference
designations - Part 1: Basic rules
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SIST EN IEC 81346-2:2019
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SIST EN IEC 81346-2:2019
IEC 81346-2
Edition 2.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL STANDARD
NORME HORIZONTALE
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
INTERNATIONALE
ICS 01.110; 29.020 ISBN 978-2-8322-7001-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

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SIST EN IEC 81346-2:2019
– 2 – IEC 81346-2:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Classification principles ................................................................................................... 7

4.1 General ................................................................................................................... 7

4.2 Relation between classification and composition ..................................................... 8

4.3 Classification schemes of this document ................................................................. 8

5 Classification scheme for the inherent function of objects ................................................ 9

5.1 General ................................................................................................................... 9

5.2 Entry classes .......................................................................................................... 9

5.3 Complete classification scheme ............................................................................ 10

6 Classification of spaces ................................................................................................. 69

7 Classification of objects applicable for infrastructure ..................................................... 79

Annex A (informative) Classification criteria for objects ........................................................ 82

A.1 General ................................................................................................................. 82

A.2 Structure of classes and subclasses ..................................................................... 82

A.3 Definition of classes .............................................................................................. 83

Annex B (informative) Object classes related to a generic process ...................................... 84

Annex C (informative) Object classes related to objects in a generic infrastructure .............. 85

Annex D (informative) Comparison between Tables 1, 2 and 3 of this document and

Tables 1 and 2 of IEC 81346-2:2009 ..................................................................................... 87

Annex E (informative) Basic requirements for the development of IEC 81346-2 ................... 91

Bibliography .......................................................................................................................... 92

Figure 1 – Illustration of a classification hierarchy and a composition hierarchy ...................... 8

Figure A.1 – Illustration of class hierarchy ............................................................................ 83

Figure B.1 – Object classes related to a generic process ...................................................... 84

Figure C.1 – Object classes related to objects in a generic infrastructure .............................. 86

Table 1 – Entry classes ......................................................................................................... 10

Table 2 – First two levels of the classification scheme for inherent function of objects .......... 11

Table 3 – Complete classification scheme for inherent function of objects............................. 26

Table 4 – Classification scheme for spaces........................................................................... 70

Table 5 – Classes of infrastructure objects ........................................................................... 80

Table 6 – Examples of branch-related classes B to U of Table 5 ........................................... 81

Table D.1 – Comparison between Table 1 of the current edition and Table 1 of IEC

81346-2:2009........................................................................................................................ 87

Table D.2 – Comparison between Table 2 and Table 3 of the current edition and Table

2 of IEC 81346-2:2009 .......................................................................................................... 87

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SIST EN IEC 81346-2:2019
IEC 81346-2:2019 © IEC 2019 – 3 –
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 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 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.

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 81346-2 has been prepared by IEC technical committee 3:

Information structures and elements, identification and marking principles, documentation and

graphical symbols, in cooperation with ISO technical committee 10: Technical product

documentation.
It is published as a double logo standard.
It has the status of a horizontal standard in accordance with IEC Guide 108.

This second edition cancels and replaces the first edition published in 2009. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
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SIST EN IEC 81346-2:2019
– 4 – IEC 81346-2:2019 © IEC 2019

a) The entry classes of the classification scheme have been defined to reflect the “inherent

function” of the object classified;

b) The classes are defined to align with the principles of ISO 22274 and ISO 704;

c) A three-level classification scheme has been defined, which provides a greater flexibility

for the designer in some technical fields;

d) Classes are defined by their definition and provided with a preferred term. Examples are

provided if needed;
e) A separate classification scheme for spaces has been provided.
The text of this International Standard is based on the following documents:
FDIS Report on voting
3/1393/FDIS 3/1402/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 81346 series, published under the general title Industrial systems,

installations and equipment and industrial products – Structuring principles and reference

designations, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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SIST EN IEC 81346-2:2019
IEC 81346-2:2019 © IEC 2019 – 5 –
INTRODUCTION

The aim of this document is to establish classification schemes for objects with assigned letter

codes for the defined classes, which can be applied throughout all technical areas,

e.g. electric, mechanical, process and civil engineering as well as all branches of industry,

e.g. energy, chemical, construction, automotive, shipbuilding and marine. The letter codes are

intended for use with the rules for the construction of reference designations in accordance

with IEC 81346-1 and other parts of the ISO/IEC 81346 series. The letter codes can also be

used ”stand-alone” as a generic type designation where a type of component is to be

indicated, for example in specifications.

The classification scheme in Clause 5 of this document is an enumerative and faceted

classification scheme with the inherent function as the entry class. It is made in accordance

with the rules in ISO 704 and the guidelines in ISO 22274.

At the entry level, as shown in Table 1, the inherent function is used to narrow down the areas

of applicability of the individual classes to a manageable size. For the sub-divisions of the

entry classes, faceted approaches are applied to specify the nature of the concepts contained

in the leaf classes.

By applying this method, this document provides stable class codes for objects (including

systems and system elements), which are independent of how the objects are used or applied

in any design during the entire lifecycle.

Any class is defined by its definition only. Users should select the appropriate class for their

object to be classified based on the definition, and not rely upon the class name or the

examples.
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SIST EN IEC 81346-2:2019
– 6 – IEC 81346-2:2019 © IEC 2019
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
Part 2: Classification of objects and codes for classes
1 Scope

This part of IEC 81346 establishes classification schemes with defined object classes and

their associated letter codes, and is primarily intended for use in reference designations and

for designation of generic types.

The classification schemes are applicable for objects in all technical disciplines and all

branches of industry.

This document is a horizontal publication also intended for use by technical committees in

preparation of publications related to reference designations in accordance with the principles

laid down in IEC Guide 108.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 81346-1:2009, Industrial systems, installations and equipment and industrial products –

Structuring principles and reference designations – Part 1: Basic rules
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 81346-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
inherent function
function of an object, independent of any application of the object

Note 1 to entry: Inherent is regarded as existing in something as a permanent, essential, or characteristic

attribute.
3.2
classification scheme

descriptive information for an arrangement or division of objects into groups based on criteria

such as characteristics, which the objects have in common

Note 1 to entry: A classification scheme is a concept system used for classifying some objects.

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SIST EN IEC 81346-2:2019
IEC 81346-2:2019 © IEC 2019 – 7 –
[SOURCE: ISO/IEC 11179-1:2015, 3.3.4, modified – examples deleted.]
3.3
class of object
set of objects characterized by the same inherent function
3.4
space
limited three-dimensional extent defined physically or notionally
[SOURCE: ISO 12006-2:2015, 3.1.8]
3.5
type-of relation

relation between two classes where the characteristics defining one of the classes includes

that of the other class and at least one additional delimiting characteristic

Note 1 to entry: This term corresponds to the term "generic relation" defined in ISO 1087-1:2000, 3.2.21.

3.6
part-of relation

relation between two classes where one of the classes constitutes the whole and the other

class a part of that whole

Note 1 to entry: This term corresponds to the term "partitive relation" defined in ISO 1087-1:2000, 3.2.22.

Note 2 to entry: Part-of relation is also known as partitive relation, part-whole relation or whole-part relation.

Note 3 to entry: See also IEC 81346-1.
3.7
activity space
space defined by the spatial extension of an activity

Note 1 to entry: A spatial extension of an activity, for example, a table or a bed, and the activity space around

them.
[SOURCE: ISO 12006-2:2015, 3.1.9]
3.8
built space

space defined by built or natural environment or both, intended for user activity or equipment

Note 1 to entry: A built space is, for example, a room defined by floor, ceiling, and wall, or a footpath, or power-

line corridor defined by a natural forest.

Note 2 to entry: Spaces occupied by construction elements are known as construction spaces, and are handled

as properties of construction elements themselves.
[SOURCE: ISO 12006-2:2015, 3.4.4]
4 Classification principles
4.1 General

The purpose of classifying is to distinguish among objects in a collection based on

differentiation of characteristics of interest. Classes are organized in type-of relations and are

defined by different values of a specific characteristic of interest.
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SIST EN IEC 81346-2:2019
– 8 – IEC 81346-2:2019 © IEC 2019

The classification in this document is made with an entry class based on function in a broad

sense. This is in accordance with ISO 22274:2013, 5.4.4 which recommends an enumerative

and faceted classification system with an entry class.

When a class code is applied in a reference designation, the purpose is to classify the

occurrence of the object, not the individual, as described in IEC 81346-1:2009, 4.8 and

Table 1 (general rules). In such a situation, the object is generally specified and assigned its

inherent function in the design stage of the project. Classes can also be used by

manufacturers to show multiple potential use of a product. In this way, the classification can

enhance searchability.

The class name (preferred term) assigned to the classes and the examples of terms provided

in this document are based on the inherent function of an object, i.e. independent of any

application.

This classification scheme ensures a life cycle stable class code, as the stable object

occurrence is classified by the stable inherent function of the object occurrence: A stake is a

stake, a door is a door and so on, no matter what individual is used to realize the occurrence.

Objects related to a class may be considered as a discrete collection of objects, and may

therefore be further classified into sub-classes based on the differentiation of a specific

characteristic. In this document, this has resulted in a classification scheme starting with

classes representing general types based on function in a broad sense (1 letter code),

continuing into classes representing types that are more specialized in two steps, represented

nd rd
by 2 and 3 class code.

All examples and terms in the classification scheme of this document are recognized as being

used to name a member of their class. As different branches have different usage of

terminology, the same example or term might occur in different classes.
4.2 Relation between classification and composition

IEC 81346-1 defines rules on how an object may be structured into its constituent objects

resulting in a composition hierarchy. For the purpose of classifying objects, this document

defines classes and codes that results in a classification hierarchy, see Figure 1, which is a

copy of Figure 2 in 4.2 of ISO 12006-2:2015.
IEC

Figure 1 – Illustration of a classification hierarchy and a composition hierarchy

4.3 Classification schemes of this document

This document provides different classification schemes of objects primarily intended for use

in reference designations, based on the basic requirements given in Annex E. The provided

classification schemes are:
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SIST EN IEC 81346-2:2019
IEC 81346-2:2019 © IEC 2019 – 9 –
• inherent function of objects, see Clause 5;
• spaces, see Clause 6;
• infrastructure objects, see Clause 7.

The content of any class is determined by the definition of the class only. A preferred term

determines the class in daily use and forms part of the definition of subclasses. The

classification tables of this document are considered to be complete, and therefore no

“miscellaneous” or “other” classes are present. If no appropriate class for an object-of-interest

can be found on a sub or sub-sub level, objects shall be classified to the higher level i.e. to

the sub-class or entry class.

This document provides classification schemes with multiple classification levels. The user

may choose to apply letter codes using
• a single letter, representing the entry class; or
• two letter code, representing a sub-class in the scheme; or
• three letter code, representing a sub-sub-class in the scheme.
5 Classification scheme for the inherent function of objects
5.1 General

The classification scheme defined in this clause is based on the inherent function of objects.

The classification scheme has a hierarchical classification structure that constitute three

levels from top to lower.

The entry classes and their respective subclasses are defined considering the inherent

function of objects, based on the knowledge of the use of objects in existing designs, and the

classification schemes defined in IEC 81346-2:2009.

NOTE 1 When the classification scheme shown in Table 1 and Table 2 refer to high voltage (HV) or low voltage

(LV), high voltage is considered to be any voltage > 1 000 V AC or > 1 500 V DC. Low voltage is considered to be

any voltage ≤ 1 000 V AC or ≤ 1 500 V DC. These voltage limits are in accordance with IEC 61140.

NOTE 2 In Annex D the difference between the classification scheme and classes in IEC 81346-2:2009 and the

classification scheme and classes of this publication is given.
5.2 Entry classes

Table 1 defines the entry classes for the classification scheme for inherent function of objects.

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SIST EN IEC 81346-2:2019
– 10 – IEC 81346-2:2019 © IEC 2019
Table 1 – Entry classes
Class code Class definition Class name
B object for picking up information and providing a sensing object
representation
C object for storing for subsequent retrieval storing object
E object for emitting emitting object
F object for protecting against the effects of protecting object
...

SLOVENSKI STANDARD
SIST EN IEC 81346-2:2019
01-november-2019
Nadomešča:
SIST EN 81346-2:2009
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela
strukturiranja in referenčne oznake - 2. del: Razvrščanje objektov v razrede in
njihove kode (IEC 81346-2:2019)

Industrial systems, installations and equipment and industrial products - Structuring

principles and reference designations - Part 2: Classification of objects and codes for

classes (IEC 81346-2:2019)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -

Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von

Objekten und Kennbuchstaben für Klassen (IEC 81346-2:2019)

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 (IEC 81346-2:2019)
Ta slovenski standard je istoveten z: EN IEC 81346-2:2019
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN IEC 81346-2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD EN IEC 81346-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2019
ICS 01.110; 29.020 Supersedes EN 81346-2:2009 and all of its amendments
and corrigenda (if any)
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 81346-2:2019)

Systèmes industriels, installations et appareils, et produits Industrielle Systeme, Anlagen und Ausrüstungen und

industriels - Principes de structuration et désignations de Industrieprodukte - Strukturierungsprinzipien und

référence - Partie 2: Classification des objets et codes pour Referenzkennzeichnung - Teil 2: Klassifizierung von

les classes Objekten und Kennbuchstaben für Klassen
(IEC 81346-2:2019) (IEC 81346-2:2019)

This European Standard was approved by CENELEC on 2019-07-23. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 81346-2:2019 E
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EN IEC 81346-2:2019 (E)
European foreword

The text of document 3/1393/FDIS, future edition 2 of IEC 81346-2, prepared by IEC/TC 3

"Information structures and elements, identification and marking principles, documentation and

graphical symbols" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN IEC 81346-2:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-04-23

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-07-23

document have to be withdrawn

This document supersedes EN 81346-2:2009 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 81346-2:2019 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 60898 (series) NOTE Harmonized as EN 60898 (series)
Harmonized as EN ISO 12006-2 (not
ISO 12006-2:2015 NOTE
modified)
Under preparation. Stage at the time of publication: prEN ISO 12006-2:2019.
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EN IEC 81346-2:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 81346-1 2009 Industrial systems, installations and EN 81346-1 2009
equipment and industrial products -
Structuring principles and reference
designations - Part 1: Basic rules
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IEC 81346-2
Edition 2.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL STANDARD
NORME HORIZONTALE
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
INTERNATIONALE
ICS 01.110; 29.020 ISBN 978-2-8322-7001-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

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– 2 – IEC 81346-2:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Classification principles ................................................................................................... 7

4.1 General ................................................................................................................... 7

4.2 Relation between classification and composition ..................................................... 8

4.3 Classification schemes of this document ................................................................. 8

5 Classification scheme for the inherent function of objects ................................................ 9

5.1 General ................................................................................................................... 9

5.2 Entry classes .......................................................................................................... 9

5.3 Complete classification scheme ............................................................................ 10

6 Classification of spaces ................................................................................................. 69

7 Classification of objects applicable for infrastructure ..................................................... 79

Annex A (informative) Classification criteria for objects ........................................................ 82

A.1 General ................................................................................................................. 82

A.2 Structure of classes and subclasses ..................................................................... 82

A.3 Definition of classes .............................................................................................. 83

Annex B (informative) Object classes related to a generic process ...................................... 84

Annex C (informative) Object classes related to objects in a generic infrastructure .............. 85

Annex D (informative) Comparison between Tables 1, 2 and 3 of this document and

Tables 1 and 2 of IEC 81346-2:2009 ..................................................................................... 87

Annex E (informative) Basic requirements for the development of IEC 81346-2 ................... 91

Bibliography .......................................................................................................................... 92

Figure 1 – Illustration of a classification hierarchy and a composition hierarchy ...................... 8

Figure A.1 – Illustration of class hierarchy ............................................................................ 83

Figure B.1 – Object classes related to a generic process ...................................................... 84

Figure C.1 – Object classes related to objects in a generic infrastructure .............................. 86

Table 1 – Entry classes ......................................................................................................... 10

Table 2 – First two levels of the classification scheme for inherent function of objects .......... 11

Table 3 – Complete classification scheme for inherent function of objects............................. 26

Table 4 – Classification scheme for spaces........................................................................... 70

Table 5 – Classes of infrastructure objects ........................................................................... 80

Table 6 – Examples of branch-related classes B to U of Table 5 ........................................... 81

Table D.1 – Comparison between Table 1 of the current edition and Table 1 of IEC

81346-2:2009........................................................................................................................ 87

Table D.2 – Comparison between Table 2 and Table 3 of the current edition and Table

2 of IEC 81346-2:2009 .......................................................................................................... 87

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IEC 81346-2:2019 © IEC 2019 – 3 –
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 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 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.

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 81346-2 has been prepared by IEC technical committee 3:

Information structures and elements, identification and marking principles, documentation and

graphical symbols, in cooperation with ISO technical committee 10: Technical product

documentation.
It is published as a double logo standard.
It has the status of a horizontal standard in accordance with IEC Guide 108.

This second edition cancels and replaces the first edition published in 2009. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
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– 4 – IEC 81346-2:2019 © IEC 2019

a) The entry classes of the classification scheme have been defined to reflect the “inherent

function” of the object classified;

b) The classes are defined to align with the principles of ISO 22274 and ISO 704;

c) A three-level classification scheme has been defined, which provides a greater flexibility

for the designer in some technical fields;

d) Classes are defined by their definition and provided with a preferred term. Examples are

provided if needed;
e) A separate classification scheme for spaces has been provided.
The text of this International Standard is based on the following documents:
FDIS Report on voting
3/1393/FDIS 3/1402/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 81346 series, published under the general title Industrial systems,

installations and equipment and industrial products – Structuring principles and reference

designations, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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IEC 81346-2:2019 © IEC 2019 – 5 –
INTRODUCTION

The aim of this document is to establish classification schemes for objects with assigned letter

codes for the defined classes, which can be applied throughout all technical areas,

e.g. electric, mechanical, process and civil engineering as well as all branches of industry,

e.g. energy, chemical, construction, automotive, shipbuilding and marine. The letter codes are

intended for use with the rules for the construction of reference designations in accordance

with IEC 81346-1 and other parts of the ISO/IEC 81346 series. The letter codes can also be

used ”stand-alone” as a generic type designation where a type of component is to be

indicated, for example in specifications.

The classification scheme in Clause 5 of this document is an enumerative and faceted

classification scheme with the inherent function as the entry class. It is made in accordance

with the rules in ISO 704 and the guidelines in ISO 22274.

At the entry level, as shown in Table 1, the inherent function is used to narrow down the areas

of applicability of the individual classes to a manageable size. For the sub-divisions of the

entry classes, faceted approaches are applied to specify the nature of the concepts contained

in the leaf classes.

By applying this method, this document provides stable class codes for objects (including

systems and system elements), which are independent of how the objects are used or applied

in any design during the entire lifecycle.

Any class is defined by its definition only. Users should select the appropriate class for their

object to be classified based on the definition, and not rely upon the class name or the

examples.
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– 6 – IEC 81346-2:2019 © IEC 2019
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
Part 2: Classification of objects and codes for classes
1 Scope

This part of IEC 81346 establishes classification schemes with defined object classes and

their associated letter codes, and is primarily intended for use in reference designations and

for designation of generic types.

The classification schemes are applicable for objects in all technical disciplines and all

branches of industry.

This document is a horizontal publication also intended for use by technical committees in

preparation of publications related to reference designations in accordance with the principles

laid down in IEC Guide 108.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 81346-1:2009, Industrial systems, installations and equipment and industrial products –

Structuring principles and reference designations – Part 1: Basic rules
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 81346-1 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
inherent function
function of an object, independent of any application of the object

Note 1 to entry: Inherent is regarded as existing in something as a permanent, essential, or characteristic

attribute.
3.2
classification scheme

descriptive information for an arrangement or division of objects into groups based on criteria

such as characteristics, which the objects have in common

Note 1 to entry: A classification scheme is a concept system used for classifying some objects.

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IEC 81346-2:2019 © IEC 2019 – 7 –
[SOURCE: ISO/IEC 11179-1:2015, 3.3.4, modified – examples deleted.]
3.3
class of object
set of objects characterized by the same inherent function
3.4
space
limited three-dimensional extent defined physically or notionally
[SOURCE: ISO 12006-2:2015, 3.1.8]
3.5
type-of relation

relation between two classes where the characteristics defining one of the classes includes

that of the other class and at least one additional delimiting characteristic

Note 1 to entry: This term corresponds to the term "generic relation" defined in ISO 1087-1:2000, 3.2.21.

3.6
part-of relation

relation between two classes where one of the classes constitutes the whole and the other

class a part of that whole

Note 1 to entry: This term corresponds to the term "partitive relation" defined in ISO 1087-1:2000, 3.2.22.

Note 2 to entry: Part-of relation is also known as partitive relation, part-whole relation or whole-part relation.

Note 3 to entry: See also IEC 81346-1.
3.7
activity space
space defined by the spatial extension of an activity

Note 1 to entry: A spatial extension of an activity, for example, a table or a bed, and the activity space around

them.
[SOURCE: ISO 12006-2:2015, 3.1.9]
3.8
built space

space defined by built or natural environment or both, intended for user activity or equipment

Note 1 to entry: A built space is, for example, a room defined by floor, ceiling, and wall, or a footpath, or power-

line corridor defined by a natural forest.

Note 2 to entry: Spaces occupied by construction elements are known as construction spaces, and are handled

as properties of construction elements themselves.
[SOURCE: ISO 12006-2:2015, 3.4.4]
4 Classification principles
4.1 General

The purpose of classifying is to distinguish among objects in a collection based on

differentiation of characteristics of interest. Classes are organized in type-of relations and are

defined by different values of a specific characteristic of interest.
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– 8 – IEC 81346-2:2019 © IEC 2019

The classification in this document is made with an entry class based on function in a broad

sense. This is in accordance with ISO 22274:2013, 5.4.4 which recommends an enumerative

and faceted classification system with an entry class.

When a class code is applied in a reference designation, the purpose is to classify the

occurrence of the object, not the individual, as described in IEC 81346-1:2009, 4.8 and

Table 1 (general rules). In such a situation, the object is generally specified and assigned its

inherent function in the design stage of the project. Classes can also be used by

manufacturers to show multiple potential use of a product. In this way, the classification can

enhance searchability.

The class name (preferred term) assigned to the classes and the examples of terms provided

in this document are based on the inherent function of an object, i.e. independent of any

application.

This classification scheme ensures a life cycle stable class code, as the stable object

occurrence is classified by the stable inherent function of the object occurrence: A stake is a

stake, a door is a door and so on, no matter what individual is used to realize the occurrence.

Objects related to a class may be considered as a discrete collection of objects, and may

therefore be further classified into sub-classes based on the differentiation of a specific

characteristic. In this document, this has resulted in a classification scheme starting with

classes representing general types based on function in a broad sense (1 letter code),

continuing into classes representing types that are more specialized in two steps, represented

nd rd
by 2 and 3 class code.

All examples and terms in the classification scheme of this document are recognized as being

used to name a member of their class. As different branches have different usage of

terminology, the same example or term might occur in different classes.
4.2 Relation between classification and composition

IEC 81346-1 defines rules on how an object may be structured into its constituent objects

resulting in a composition hierarchy. For the purpose of classifying objects, this document

defines classes and codes that results in a classification hierarchy, see Figure 1, which is a

copy of Figure 2 in 4.2 of ISO 12006-2:2015.
IEC

Figure 1 – Illustration of a classification hierarchy and a composition hierarchy

4.3 Classification schemes of this document

This document provides different classification schemes of objects primarily intended for use

in reference designations, based on the basic requirements given in Annex E. The provided

classification schemes are:
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IEC 81346-2:2019 © IEC 2019 – 9 –
• inherent function of objects, see Clause 5;
• spaces, see Clause 6;
• infrastructure objects, see Clause 7.

The content of any class is determined by the definition of the class only. A preferred term

determines the class in daily use and forms part of the definition of subclasses. The

classification tables of this document are considered to be complete, and therefore no

“miscellaneous” or “other” classes are present. If no appropriate class for an object-of-interest

can be found on a sub or sub-sub level, objects shall be classified to the higher level i.e. to

the sub-class or entry class.

This document provides classification schemes with multiple classification levels. The user

may choose to apply letter codes using
• a single letter, representing the entry class; or
• two letter code, representing a sub-class in the scheme; or
• three letter code, representing a sub-sub-class in the scheme.
5 Classification scheme for the inherent function of objects
5.1 General

The classification scheme defined in this clause is based on the inherent function of objects.

The classification scheme has a hierarchical classification structure that constitute three

levels from top to lower.

The entry classes and their respective subclasses are defined considering the inherent

function of objects, based on the knowledge of the use of objects in existing designs, and the

classification schemes defined in IEC 81346-2:2009.

NOTE 1 When the classification scheme shown in Table 1 and Table 2 refer to high voltage (HV) or low voltage

(LV), high voltage is considered to be any voltage > 1 000 V AC or > 1 500 V DC. Low voltage is considered to be

any voltage ≤ 1 000 V AC or ≤ 1 500 V DC. These voltage limits are in accordance with IEC 61140.

NOTE 2 In Annex D the difference between the classification scheme and classes in IEC 81346-2:2009 and the

classification scheme and classes of this publication is given.
5.2 Entry classes

Table 1 defines the entry classes for the classification scheme for inherent function of objects.

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– 10 – IEC 81346-2:2019 © IEC 2019
Table 1 – Entry classes
Class code Class definition Class name
B object for picking up information and providing a sensing object
representation
C object for storing for subsequent retrieval storing object
E object for emitting emitting object
F object for protecting against the effects of protecting object
dangerous or undesirable conditions
G object for providing a controllable flow generating object
H object for treating matter matter processing object

K object for treating input signals and providing an information processing object

appropriate output
M object for providing mechanical movement or force driving object
N object for enclosing partly or fully another object covering object
P object for providing perceptible information presenting object
Q object for controlling access or flow controll
...

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