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

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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

– 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

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

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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
doc
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