SIST EN IEC 81346-1:2022
(Main)Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1: Basic rules (IEC 81346-1:2022)
Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 1: Basic rules (IEC 81346-1:2022)
This part of IEC 81346, published jointly by IEC and ISO, establishes general principles for the structuring of systems including structuring of the information about systems.
Based on these principles, rules and guidance are given for the formulation of unambiguous reference designations for objects in any system.
The reference designation identifies objects for the purpose of creation and retrieval of information about an object, and where realized about its corresponding component.
A reference designation labelled at a component is the key to find information about that object among different kinds of documents.
The principles are general and are applicable to all technical areas (for example mechanical engineering, electrical engineering, construction engineering, process engineering). They can be used for systems based on different technologies or for systems combining several technologies.
This document is also a horizontal publication 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.
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Strukturierungsprinzipien und Referenzkennzeichnung - Teil 1: Allgemeine Regeln (IEC 81346-1:2022)
Systèmes industriels, installations et appareils, et produits industriels - Principes de structuration et désignations de référence - Partie 1: Règles de base (IEC 81346-1:2022)
L'IEC 81346-1:2022 établit les principes généraux pour la structuration des systèmes, y compris la structuration des informations sur ces systèmes.
Sur la base de ces principes, des règles et des recommandations sont données pour la formulation de désignations de référence non ambiguës applicables aux objets d’un système, quel qu’il soit.
La désignation de référence identifie des objets dans le but de créer et de récupérer des informations sur un objet et, lorsqu’elle est réalisée, au sujet de son composant correspondant.
Une désignation de référence rattachée à un composant est la clef qui permet de trouver des informations sur cet objet parmi différentes sortes de documents.
Les principes énoncés sont généraux et applicables à tous les domaines techniques (par exemple génie mécanique, électrique, civil ou des procédés). Ils peuvent être utilisés pour des systèmes basés sur des technologies différentes, ou pour des systèmes combinant plusieurs technologies.
Le présent document est également une publication horizontale destinée à être utilisée par les comités techniques pour l’établissement de publications liées aux désignations de référence conformément aux principes exposés dans l’IEC Guide 108.
L'IEC 81346-1:2022 annule et remplace la première édition, publiée en 2009. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) ajout d’une référence au Guide IEC 108 dans le domaine d’application, en tant que publication horizontale;
b) alignement sur l’IEC 81346-2:2019 et l’ISO 81346-12:2018;
c) introduction de l’aspect de type;
d) introduction d’un modèle d’information du système de désignation de référence;
e) introduction d’un modèle d’information dans le cadre du système de désignation de référence conformément à la série de Normes internationales 81346;
f) introduction d’une recommandation relative aux métadonnées pour la gestion de la structure de conception;
g) introduction de règles et d’une méthode pour la désignation des relations entre les objets;
h) introduction d’exigences relatives au développement de parties de la série de Normes internationales 81346 spécifiques à certains secteurs;
i) introduction d’exigences concernant l’incorporation de sous-objets dans les structures à objets;
j) introduction de recommandations sur la documentation de l’application de la série de Normes internationales 81346;
k) ajout de définitions de nouveaux termes utilisés;
l) ajout de nouvelles règles et modification des règles existantes;
m) conversion des notes relatives aux règles en texte normatif en tant que "Commentaire à la règle nn".
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela strukturiranja in referenčne oznake - 1. del: Osnovna pravila (IEC 81346-1:2022)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2022
Nadomešča:
SIST EN 81346-1:2009
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela
strukturiranja in referenčne oznake - 1. del: Osnovna pravila (IEC 81346-1:2022)
Industrial systems, installations and equipment and industrial products - Structuring
principles and reference designations - Part 1: Basic rules (IEC 81346-1:2022)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -
Strukturierungsprinzipien und Referenzkennzeichnung - Teil 1: Allgemeine Regeln (IEC
81346-1:2022)
Systèmes industriels, installations et appareils, et produits industriels - Principes de
structuration et désignations de référence - Partie 1: Règles de base (IEC 81346-
1:2022)
Ta slovenski standard je istoveten z: EN IEC 81346-1:2022
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke 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 IEC 81346-1
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2022
ICS 01.110; 29.020 Supersedes EN 81346-1:2009
English Version
Industrial systems, installations and equipment and industrial
products - Structuring principles and reference designations -
Part 1: Basic rules
(IEC 81346-1:2022)
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 1: Règles de base Referenzkennzeichnung - Teil 1: Allgemeine Regeln
(IEC 81346-1:2022) (IEC 81346-1:2022)
This European Standard was approved by CENELEC on 2022-05-04. 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 81346-1:2022 E
European foreword
The text of document 3/1541/FDIS, future edition 2 of IEC 81346-1, prepared by IEC/TC 3
"Documentation, graphical symbols and representations of technical information" was submitted to the
IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 81346-1:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-02-04
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-05-04
document have to be withdrawn
This document supersedes EN 81346-1:2009 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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 81346-1:2022 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 60297-3-100 NOTE Harmonized as EN 60297-3-100
IEC 60297-3-101:2004 NOTE Harmonized as EN 60297-3-101:2004 (not modified)
IEC 61175-1:2015 NOTE Harmonized as EN 61175-1:2015 (not modified)
IEC 61355-1:2008 NOTE Harmonized as EN 61355-1:2008 (not modified)
IEC 61666:2010 NOTE Harmonized as EN 61666:2010 (not modified)
IEC 61666:2010/A1:2021 NOTE Harmonized as EN 61666:2010/A1:2021 (not modified)
IEC 62023 NOTE Harmonized as EN 62023
IEC 62027 NOTE Harmonized as EN 62027
IEC 62424:2016 NOTE Harmonized as EN 62424:2016 (not modified)
IEC 62491:2008 NOTE Harmonized as EN 62491:2008 (not modified)
IEC 81714-3 NOTE Harmonized as EN 81714-3
IEC 82045-1 NOTE Harmonized as EN 82045-1
IEC 82045-2:2004 NOTE Harmonized as EN 82045-2:2005 (not modified)
IEC/IEEE 82079-1:2019 NOTE Harmonized as EN IEC/IEEE 82079-1:2020 (not modified)
ISO 3166-1 NOTE Harmonized as EN ISO 3166-1
ISO 4157 (series) NOTE Harmonized as EN ISO 4157 (series)
ISO 4157-3 NOTE Harmonized as EN ISO 4157-3
ISO 9000:2015 NOTE Harmonized as EN ISO 9000:2015 (not modified)
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 81346-2 2019 Industrial systems, installations and EN IEC 81346-2 2019
equipment and industrial products -
Structuring principles and reference
designations - Part 2: Classification of
objects and codes for classes
ISO/IEC 646 - Information technology; ISO 7-bit coded - -
character set for information interchange
ISO 81346-10 — Industrial systems, installations and - -
equipment and industrial products -
Structuring principles and reference
designation - Part 10: Power plants
ISO 81346-12 2018 Industrial systems, installations and - -
equipment and industrial products -
Structuring principles and reference
designations - Part 12: Construction works
and building services
In preparation. Stage at time of publication: ISO DIS 81346-10:2021.
IEC 81346-1
Edition 2.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
HORIZONTAL PUBLICATION
PUBLICATION HORIZONTALE
Industrial systems, installations and equipment and industrial products –
Structuring principles and reference designations –
Part 1: Basic rules
Systèmes industriels, installations et appareils, et produits industriels –
Principes de structuration et désignations de référence –
Partie 1: Règles de base
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.110; 29.020 ISBN 978-2-8322-1077-7
– 2 – IEC 81346-1:2022 © IEC 2022
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 13
3 Terms and definitions . 14
4 Concepts . 16
4.1 Object . 16
4.2 Aspect . 17
4.3 Systems . 19
4.4 Structuring . 19
4.5 Function . 19
4.6 Products and components . 20
4.7 Location . 21
4.8 Types. 21
4.9 Object occurrences and product individuals . 21
4.10 Relations between concepts . 22
5 Structuring principles . 23
5.1 General . 23
5.2 Forming structures . 26
5.3 Function-oriented structure . 28
5.4 Product-oriented structure. 29
5.5 Location-oriented structure . 30
5.6 Type-oriented structure . 31
5.7 Structures based on "other aspects" . 31
5.8 Structures based on more than one aspect . 33
6 Construction of reference designations . 34
6.1 General . 34
6.2 Format of reference designations . 35
6.2.1 Single level . 35
6.2.2 Multi-level . 36
6.2.3 Use of letter codes . 36
6.3 Different structures within the same aspect . 37
7 Reference designation set . 37
8 Designation of locations . 39
8.1 General . 39
8.2 Assemblies . 39
9 Presentation of reference designations . 41
9.1 Reference designations . 41
9.2 Reference designation set . 42
9.3 Presentation of identifiers for the top-node . 43
10 Labelling . 44
11 Presentation of properties for an object . 45
12 Application of the reference designation system . 46
Annex A (informative) Information model on the reference designation system . 47
A.1 General . 47
IEC 81346-1:2022 © IEC 2022 – 3 –
A.2 EXPRESS-G model . 47
A.3 Entity descriptions . 48
A.3.1 object . 48
A.3.2 aspect . 48
A.3.3 object_occurrence . 48
A.3.4 function_occurrence . 48
A.3.5 product_occurrence . 49
A.3.6 location_occurrence. 49
A.3.7 type_occurrence . 49
A.3.8 other_aspect_occurrence. 49
A.3.9 reference_designation . 49
A.3.10 single_level_reference_designation . 49
A.3.11 multi_level_reference_designation . 50
A.3.12 reference_designation_set . 50
A.3.13 classification_scheme . 50
A.3.14 class . 50
A.3.15 top_node_identifier . 51
A.3.16 product_individual . 51
A.4 Enumerations . 51
A.4.1 aspect_kind . 51
A.4.2 81346_classification_domain . 51
A.5 EXPRESS code . 52
Annex B (informative) Establishment and life cycle of objects . 54
B.1 Establishment and validity of objects . 54
B.2 Life cycle story of an object. 55
B.2.1 Overview . 55
B.2.2 Function aspect and function based on a function-oriented structure (A). 55
B.2.3 Functional requirement specification FR1 (B) . 57
B.2.4 Location aspect and reference designation based on a location-oriented
structure (C) . 57
B.2.5 Component type specification CT1 (D) . 57
B.2.6 Function list for system design FL1 and location list for physical design
LL1 (E) . 58
B.2.7 Product specification PS1 (F) . 58
B.2.8 Parts list for manufacturing/installation PL1 (G) . 58
B.2.9 Transport specification (H) . 59
B.2.10 Installation (J) . 59
B.2.11 Commissioning (K) . 59
B.2.12 Acceptance and individual log IL1 (L) . 59
B.2.13 Operation and maintenance (M) . 59
B.2.14 Alternative motor product individual (N) . 60
B.2.15 Alternative motor type and supplier CT2, PS2 (P) . 60
B.2.16 Process modification (R) . 60
B.2.17 Location extension (S) . 60
B.2.18 Etc. (T) . 60
B.2.19 Closing down (U) . 60
B.2.20 Dismantling (V) . 60
B.2.21 Life cycle end (X) . 61
B.3 Discussion on the concept "object" . 61
– 4 – IEC 81346-1:2022 © IEC 2022
B.3.1 Different meanings of "motor" . 61
B.3.2 Definition of "object" . 61
B.4 Discussion on different life cycles . 62
Annex C (informative) Manipulation of objects . 63
C.1 General . 63
C.2 Establishment and validity of objects . 63
C.2.1 Structuring . 63
C.2.2 Ending the structuring . 64
C.2.3 Relations between closely related objects . 64
C.2.4 The roles of the reference designations set . 66
C.2.5 Example . 66
C.3 Life cycle situations . 71
C.3.1 One object for all aspects . 71
C.3.2 One object for each aspect . 72
Annex D (informative) Interpretation of reference designations using different aspects . 74
Annex E (normative) Object represented with several top nodes in an aspect . 77
E.1 General . 77
E.2 Example using aspect shift in structures . 77
E.3 Example using aspect-oriented structures . 78
Annex F (informative) Examples of multiple structures based on the same aspect . 80
F.1 Different function-oriented structures for a process plant . 80
F.2 Topographical location of a system versus locations within an assembly. 81
F.3 Different structuring for different needs . 82
Annex G (normative) Incorporating sub-objects in object structures . 84
G.1 General . 84
G.2 Example. 84
Annex H (informative) Example of reference designations within a system . 88
Annex I (normative) Designation of relations between objects . 94
I.1 General . 94
I.2 Basic principles . 94
I.3 Designation of associative relations . 94
I.4 Classification of relation kinds . 95
I.5 Example of designation of associative relations . 95
Annex J (normative) Requirements for developing sector-specific parts of the
International Standard 81346 series . 97
J.1 General . 97
J.2 81346 framework information model. 97
J.2.1 EXPRESS-G model . 97
J.2.2 Entity descriptions . 98
J.2.3 Enumerations – 81346_classification_domain . 100
J.2.4 EXPRESS code . 102
Annex K (informative) Metadata resource for structure management . 103
Annex L (informative) Recommendations for documentation of the application of the
reference designation system . 105
Annex M (informative) Fundamental ideas for this document. 111
M.1 General . 111
M.2 Basic requirements for a reference designation system . 111
M.3 Required properties for a reference designation system . 111
IEC 81346-1:2022 © IEC 2022 – 5 –
Annex N (informative) Relationship to other standards . 112
N.1 General . 112
N.2 Use together with ISO/IEC/IEEE 42010:2011 . 112
N.2.1 General . 112
N.2.2 Architecture description and architecture description language . 112
N.3 Use together with IEC 61355-1:2008 . 113
N.3.1 General . 113
N.3.2 Document designation . 113
N.4 Use together with IEC 61175-1:2015 . 114
N.4.1 General . 114
N.4.2 Signal designation . 114
N.5 Use together with IEC 61666:2010 . 115
N.5.1 General . 115
N.5.2 Terminal designation . 115
Bibliography . 116
Figure 1 – International Standards providing a consistent system for designation,
documentation and presentation of information . 12
Figure 2 – Illustration of an object . 17
Figure 3 – Aspects of an object . 18
Figure 4 – Generic relation between the functionality of a technical system and a
technical process . 19
Figure 5 – Example of functionality of a technical system and a technical process . 20
Figure 6 – Illustration of the concept’s product, component, type, individual and
occurrence . 22
Figure 7 – Illustration of structural decomposition of an object from different aspects . 24
Figure 8 – Illustration of a function-oriented decomposition and product-oriented
composition . 25
Figure 9 – Structure tree of object A (alternative 1) . 26
Figure 10 – Structure tree of object A (alternative 2) . 26
Figure 11 – Constituents in one aspect of object type 1 . 27
Figure 12 – Constituents in one aspect of object type 2 . 27
Figure 13 – Constituents in one aspect of object type 5 . 27
Figure 14 – Structure tree of object type 1 . 28
Figure 15 – Illustration of a function-oriented structure . 29
Figure 16 – Illustration of a product-oriented structure . 30
Figure 17 – Illustration of a location-oriented structure . 31
Figure 18 – Example of the use of "other aspect" . 32
Figure 19 – Example of the use of "other aspect" . 33
Figure 20 – Illustration of an object accessible from three aspects, and where these
aspects are used also for internal structuring . 33
Figure 21 – Illustration of an object identified by means of one aspect and with sub-
objects identified by means of another aspect . 34
Figure 22 – Relation between a multi-level reference designation and its single-level
reference designations . 36
Figure 23 – Example of reference designation sets . 38
Figure 24 – Example of designation of mounting planes inside a factory build assembly . 40
– 6 – IEC 81346-1:2022 © IEC 2022
Figure 25 – Examples of designation of locations inside a factory build assembly . 41
Figure 26 – Different objects on a site identified with top node identifiers . 44
Figure 27 – The common initial portion of reference designations . 44
Figure 28 – Labelling of reference designations . 45
Figure 29 – Presentation of a property in combination with a reference designation . 45
Figure A.1 – EXPRESS-G model of the reference designation system . 47
Figure B.1 – Development situations of objects . 54
Figure B.2 – The object’s life cycle . 56
Figure C.1 – Three independently defined objects . 65
Figure C.2 – Three separate objects with mutual relations . 65
Figure C.3 – The three objects are merged into one . 66
Figure C.4 – Overview of the process system . 67
Figure C.5 – Tree-like structures of the system . 67
Figure C.6 – Completed structures of the system . 68
Figure C.7 – Structures with designated sub-objects . 69
Figure C.8 – Structures with some merged-and-shared objects . 69
Figure C.9 – Relations expressed by reference designation sets in which both
designations are unambiguous . 70
Figure C.10 – Relations expressed by reference designation sets in which one
designation is ambiguous . 71
Figure C.11 – Situations in the beginning of an object's life cycle accessible from three
aspects . 71
Figure C.12 – Situations in the beginning of the life cycle of closely related objects,
each accessible from one aspect . 72
Figure D.1 – Shift from function to product aspect . 74
Figure D.2 – Shift from product to function aspect . 74
Figure D.3 – Shift from product to location aspect . 75
Figure D.4 – Shift from location to product aspect . 75
Figure D.5 – Shift from function to location aspect . 76
Figure D.6 – Shift from location to function aspect . 76
Figure E.1 – Object represented with several independent top nodes in one aspect . 77
Figure E.2 – Example of multi-level reference designations using different aspects of
an object with several independent top nodes in one aspect . 78
Figure E.3 – Object represented with several independent top nodes in one aspect
using aspect-oriented structures . 79
Figure F.1 – Illustration of the concept of additional functional views of an industrial
process plant . 80
Figure F.2 – Location-oriented structure of a plant . 81
Figure F.3 – Location-oriented structure within an assembly unit . 81
Figure F.4 – Location-oriented structures of the plant . 82
Figure F.5 – Example of additional product-oriented structures . 83
Figure G.1 – Sub-contractor's design . 85
Figure G.2 – Receiving organization's design . 85
Figure G.3 – Full structure of the receiving organization's design . 86
Figure H.1 – Process flow diagram for a material handling plant . 88
IEC 81346-1:2022 © IEC 2022 – 7 –
Figure H.2 – Overview diagram of part of the process system (=V1) and part of the
power supply system (=Q1). 89
Figure H.3 – Structure tree for parts of the material handling plant . 90
Figure H.4 – Layout drawing of the components of the MCC =Q1=W1 . 91
Figure H.5 – Layout drawing indicating the location of the MCC . 91
Figure H.6 – Layout drawing of the locations of the MCC =Q1=W1 . 92
Figure H.7 – Motor starter . 92
Figure H.8 – Product- and location-oriented structure trees for the MCC . 93
Figure I.1 – Structure of a relation designation . 95
Figure J.1 – International Standard 81346 framework – An EXPRESS-G model . 98
Figure N.1 – Principle of document designation . 113
Figure N.2 – Signal designation and signal connection identification . 114
Figure N.3 – Principle of terminal designation . 115
Table 1 – Identification of types, occurrences and individuals within different contexts . 23
Table 2 – Examples of single-level reference designations . 35
Table 3 – Examples of multi-level reference designations with multiple prefix signs . 37
Table 4 – Examples of presentations of multi-level reference designations . 42
Table 5 – Presentation of reference designations of a reference designation set . 43
Table C.1 – Possible reference designation sets . 70
Table G.1 – Reference designations in the receiver's design . 87
Table H.1 – Reference designation set for the constituents of the products MCC and
motor starter . 93
Table I.1 – Example of classification scheme for associative relations . 96
Table I.2 – Examples of relation designations . 96
Table K.1 – Metadata elements for reference designation systems . 104
Table L.1 – Documentation on the application of the rules . 105
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
Part 1: Basic rules
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
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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.
IEC 81346-1 has been prepared by IEC technical committee 3: Documentation, graphical
symbols and representations of technical information, in close cooperation with ISO technical
committee 10: Technical product documentation. It is an International Standard.
It is published as a double logo standard and has the status of a horizontal publication 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:
a) the scope includes a reference to IEC Guide 108 for being a horizontal publication;
b) synchronization with IEC 81346-2:2019 and ISO 81346-12:2018;
IEC 81346-1:2022 © IEC 2022 – 9 –
c) the introduction of the type aspect;
d) introduction of an information model of the reference designation system;
e) introduction of an information model for the framework of reference designation system to
comply with International Standard 81346 series;
f) introduction of recommendation for metadata for design structure management;
g) introduction of rules and method for designation of relations between objects;
h) introduction of requirements for development of sector-specific parts of the International
Standard 81346 series;
i) introduction of requirements for incorporation of sub-object in object structures;
j) introduction of recommendations for documentation of the application of the International
Standard 81346 series;
k) introduced definition of new terms used;
l) new rules added and existing rules modified;
m) notes related to rules are converted to normative text as "Comment to Rule nn".
The text of this International Standard is based on the following documents:
Draft Report on voti
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