Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classes (IEC 81346-2:2009)

This part of International Standard 81346, published jointly by IEC and ISO defines classes and subclasses of objects based on a purpose- or task-related view of the objects, together with their associated letter codes to be used in reference designations. The classification is applicable for objects in all technical areas, e.g. electrical, mechanical and civil engineering as well as all branches of industry, e.g. energy, chemical industry, building technology, shipbuilding and marine technology, and can be used by all technical disciplines in any design process.

Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von Objekten und Kennbuchstaben für Klassen (IEC 81346-2:2009)

Systèmes industriels, installations et appareils, et produits industriels - Principes de structuration et désignations de référence - Partie 2: Classification des objets et codes pour les classes (CEI 81346-2:2009)

La CEI 81346-2:2009 publiée conjointement par le CEI et l'ISO définit les classes et les sous-classes d'objets basées sur une vision des objets liée à l'objectif ou à la tâche concerné(e), ainsi que leurs lettres codes associées, à utiliser dans les désignations de référence. La classification est applicable aux objets appartenant à tous les domaines techniques, par exemple génie civil, électrique, mécanique et aussi bien que toutes les branches d'industrie, par exemple énergie, industrie chimique, technologie de la construction, construction navale et technologie marine et dans tout processus de conception.

Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela strukturiranja in referenčne oznake - 2. del: Razvrščanje objektov v razrede in njihove kode (IEC 81346-2:2009)

General Information

Status
Withdrawn
Publication Date
12-Oct-2009
Withdrawal Date
03-Apr-2022
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
04-Apr-2022
Due Date
27-Apr-2022
Completion Date
04-Apr-2022

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SLOVENSKI STANDARD
SIST EN 81346-2:2009
01-december-2009
1DGRPHãþD
SIST EN 61346-2:2003
SIST EN 61346-2:2003
,QGXVWULMVNLVLVWHPLLQãWDODFLMHLQRSUHPDWHULQGXVWULMVNLL]GHONL1DþHOD
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Industrial systems, installations and equipment and industrial products - Structuring

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

classes (IEC 81346-2:2009)
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -

Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von

Objekten und Kennbuchstaben für Klassen (IEC 81346-2:2009)

Systèmes industriels, installations et appareils, et produits industriels - Principes de

structuration et désignations de référence - Partie 2: Classification des objets et codes

pour les classes (CEI 81346-2:2009)
Ta slovenski standard je istoveten z: EN 81346-2:2009
ICS:
01.110 7HKQLþQDGRNXPHQWDFLMD]D Technical product
L]GHONH documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN 81346-2:2009 en,fr

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

---------------------- Page: 1 ----------------------
SIST EN 81346-2:2009
---------------------- Page: 2 ----------------------
SIST EN 81346-2:2009
EUROPEAN STANDARD
EN 81346-2
NORME EUROPÉENNE
October 2009
EUROPÄISCHE NORM
ICS 01.110; 29.020 Supersedes EN 61346-2:2000
English version
Industrial systems, installations and equipment and industrial products -
Structuring principles and reference designations -
Part 2: Classification of objects and codes for classes
(IEC 81346-2:2009)
Systèmes industriels, installations Industrielle Systeme, Anlagen

et appareils, et produits industriels - und Ausrüstungen und Industrieprodukte -

Principes de structuration Strukturierungsprinzipien
et désignations de référence - und Referenzkennzeichnung -
Partie 2: Classification des objets Teil 2: Klassifizierung von Objekten
et codes pour les classes und Kennbuchstaben für Klassen
(CEI 81346-2:2009) (IEC 81346-2:2009)

This European Standard was approved by CENELEC on 2009-08-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

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

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 81346-2:2009 E
---------------------- Page: 3 ----------------------
SIST EN 81346-2:2009
EN 81346-2:2009 - 2 -
Foreword

The text of document 3/945/FDIS, future edition 1 of IEC 81346-2, prepared by IEC TC 3, Information

structures, documentation and graphical symbols, and ISO TC 10, Technical product documentation, was

submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 81346-2 on

2009-08-01.
This European Standard supersedes EN 61346-2:2000.

EN 81346-2:2009 includes the following technical changes with respect to EN 61346-2:2000:

– all rules concerning the application of letter codes have been removed as these should be included in

another publication dealing with the application of letter codes within reference designations.

The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2010-05-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2012-08-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 81346-2:2009 was approved by CENELEC as a European

Standard without any modification.
__________
---------------------- Page: 4 ----------------------
SIST EN 81346-2:2009
- 3 - EN 81346-2:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
1) 2)
IEC 81346-1 - Industrial systems, installations and EN 81346-1 2009
equipment and industrial products -
Structuring principles and reference
designations -
Part 1: Basic rules
ISO 14617-6 2002 Graphical symbols for diagrams - - -
Part 6: Measurement and control functions
Undated reference.
Valid edition at date of issue.
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SIST EN 81346-2:2009
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SIST EN 81346-2:2009
IEC 81346-2
Edition 1.0 2009-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial systems, installations and equipment and industrial products –
Structuring principles and reference designations –
Part 2: Classification of objects and codes for classes
Systèmes industriels, installations et appareils, et produits industriels –
Principes de structuration et désignations de référence –
Partie 2: Classification des objets et codes pour les classes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 01.110; 29.020 ISBN 2-8318-1053-5
---------------------- Page: 7 ----------------------
SIST EN 81346-2:2009
– 2 – 81346-2 © IEC:2009
CONTENTS

FOREWORD...........................................................................................................................4

INTRODUCTION.....................................................................................................................6

0.1 General...................................................................................................................6

0.2 Basic requirements for this standard .......................................................................6

1 Scope...............................................................................................................................8

2 Normative references .......................................................................................................8

3 Terms and definitions .......................................................................................................8

4 Classification principles ....................................................................................................8

4.1 General ...................................................................................................................8

4.2 Assigning objects to classes....................................................................................9

5 Classes of objects ..........................................................................................................11

5.1 Classes of objects according to intended purpose or task......................................11

5.2 Subclasses of objects according to intended purpose or task ................................17

5.3 Classes of objects according to infrastructure .......................................................36

Annex A (informative) Object-classes related to a generic process ......................................39

Annex B (informative) Object-classes related to objects in a generic infrastructure ..............41

Figure 1 – Constituent objects ................................................................................................7

Figure 2 – The basic concept..................................................................................................8

Figure 3 – Classification of objects in a measuring circuit .....................................................10

Figure A.1 – Object-classes related to a process ..................................................................39

Figure B.1 – Object-classes related to objects in a generic infrastructure..............................42

Table 1 – Classes of objects according to their intended purpose or task (Codes A to D)......12

Table 1 (continued, codes E to J)..........................................................................................13

Table 1 (continued, codes K to P) .........................................................................................14

Table 1 (continued, codes Q to U) ........................................................................................15

Table 1 (continued, codes V to Z) .........................................................................................16

Table 2 – Definitions and letter codes of subclasses related to main classes (Class A).........18

Table 2 (continued, class B) .................................................................................................19

Table 2 (continued, class C) .................................................................................................20

Table 2 (continued, class E) .................................................................................................21

Table 2 (continued, class F)..................................................................................................22

Table 2 (continued, class G) .................................................................................................23

Table 2 (continued, class H) .................................................................................................24

Table 2 (continued, class K) .................................................................................................25

Table 2 (continued, class M) .................................................................................................26

Table 2 (continued, class P) .................................................................................................27

Table 2 (continued, class Q) .................................................................................................28

Table 2 (continued, class R) .................................................................................................29

Table 2 (continued, class S) .................................................................................................30

Table 2 (continued, class T)..................................................................................................31

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SIST EN 81346-2:2009
81346-2 © IEC:2009 – 3 –

Table 2 (continued, class U) .................................................................................................32

Table 2 (continued, class V) .................................................................................................33

Table 2 (continued, class W).................................................................................................34

Table 2 (continued, class X) .................................................................................................35

Table 3 – Classes of infrastructure objects ...........................................................................37

Table 4 – Examples of branch-related classes B to U of Table 3 ...........................................38

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SIST EN 81346-2:2009
– 4 – 81346-2 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL SYSTEMS, INSTALLATIONS
AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
Part 2: Classification of objects and codes for classes
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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

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

Information structures, documentation and graphical symbols and ISO technical committee

10: Technical product documentation.
It is published as a double logo standard.

This edition cancels and replaces the first edition of IEC 61346-2, published in 2000 and the

first edition of IEC/PAS 62400, published in 2005.

This edition includes the following technical changes with respect to IEC 61346-2 Ed.1:

• all rules concerning the application of letter codes have been removed as these should be

included in another publication dealing with the application of letter codes within reference

designations;
and, with respect to IEC/PAS 62400 Ed.1:
---------------------- Page: 10 ----------------------
SIST EN 81346-2:2009
81346-2 © IEC:2009 – 5 –
• the definitions of the sub-classes have been reviewed and made consistent;
• the basis for the sub-classification is indicated;
• some new subclasses for class B and class P have been added;
• the table of terms sorted according to the two-letter code has been removed;
The text of this standard is based on the following documents:
FDIS Report on voting
3/945/FDIS 3/957RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table. In ISO, the standard has been approved by 12 members

out of 13 having cast a vote.

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

A list of all parts of IEC 81346 series, formerly IEC 61346 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.

Future standards in this series will carry the new general number 81346. Numbers of existing

standards in this series will be updated at the time of the next edition.

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

the maintenance result date indicated on the IEC web site under “http://webstore.iec.ch” in the

data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 11 ----------------------
SIST EN 81346-2:2009
– 6 – 81346-2 © IEC:2009
INTRODUCTION
0.1 General

The aim of this part of IEC 81346 is to establish classification schemes for objects with

associated letter codes which can be applied throughout all technical areas, e.g. electrical,

mechanical and civil engineering as well as all branches of industry, e.g. energy, chemical

industry, building technology, shipbuilding and marine technology. The letter codes are

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

with IEC 81346-1.

Annex A illustrates how objects may be classified according to their intended purpose or task

related to a generic process.

Annex B illustrates how objects may be classified according to their position in an

infrastructure.
0.2 Basic requirements for this standard

The basic requirements were developed during the preparation of IEC 61346-2 Ed. 1, and

accepted by vote by the national committees.

NOTE These basic requirements concern the development of the letter code classification system in this standard

and not its application. They are therefore not normative vis-à-vis the application of this standard.

(1) Letter codes shall be based on a classification scheme.

(2) A classification scheme is the set of definitions for the types of objects (for example, a

classification scheme for function types containing the definition of the different function

types of objects).

(3) A classification scheme shall allow for hierarchical classification of types of objects, i.e.

subclasses and superclasses.

(4) A letter code for a type of object shall be independent of the actual position of the

instances of that type of object in a system.

(5) Distinct classes shall be defined on each level of the classification scheme.

(6) The definitions of the classes of a particular level within a classification scheme shall

have a common basis (for example, a classification scheme that, on one level, classifies

objects according to colour shall not contain classes that classify objects by shape). The

basis, however, may vary from one level to another.

(7) A letter code should indicate the type of object and not an aspect of this object.

(8) A classification scheme shall allow for expansion in order to take into account future

development and needs.

(9) A classification scheme shall be usable within all technical areas without favouring a

specific area.

(10) It shall be possible to use the letter codes consistently throughout all technical areas.

The same type of object should preferably have only one letter code independent of the

technical area where it is being used.

(11) It should be possible to indicate in a letter code from which technical area the object

originates, if this is wanted.

(12) A classification scheme should reflect the practical application of letter codes.

(13) Letter codes should not be mnemonic, as this cannot be implemented consistently

throughout a classification scheme and for different languages.

(14) Letter codes shall be formed using capital letters from the Latin alphabet, excluding I

and O due to possible confusion with the digits 1 (one) and 0 (zero).
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SIST EN 81346-2:2009
81346-2 © IEC:2009 – 7 –

(15) Different classification schemes shall be allowed and be applicable for the same type of

object.

(16) Objects may be classified for example according to function types, shapes, colours, or

material. This means that the same type of object may be assigned different letter

codes according to the different classification schemes.

(17) Objects that are directly constituents of another object using the same aspect shall be

assigned letter codes according to the same classification scheme as shown in Figure

1. See also Figure A.1.
IEC 1272/09

Objects 2, 3, and 4, which are direct constituents of object 1, shall be assigned letter codes from the same

classification scheme.

Objects 5 and 6, which are direct constituents of object 2, shall be assigned letter codes from the same

classification scheme.

Objects 7 and 8, which are direct constituents of object 4, shall be assigned letter codes from the same

classification scheme.

Objects 9, 10, 11, and 12, which are direct constituents of object 6, shall be assigned letter codes from the same

classification scheme.

Objecst 13, 14, 15, and 16, which are direct constituents of object 8, shall be assigned letter codes from the same

classification scheme.
Figure 1 – Constituent objects

(18) If products from different manufacturers are combined into a new product, the

constituents of this product may be assigned codes according to different classification

schemes.
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SIST EN 81346-2:2009
– 8 – 81346-2 © IEC:2009
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 International Standard 81346, published jointly by IEC and ISO defines classes

and subclasses of objects based on a purpose- or task-related view of the objects, together

with their associated letter codes to be used in reference designations.

The classification is applicable for objects in all technical areas, e.g. electrical, mechanical

and civil engineering as well as all branches of industry, e.g. energy, chemical industry,

building technology, shipbuilding and marine technology, and can be used by all technical

disciplines in any design process.
2 Normative references

The following referenced documents are indispensable for the application of this document.

For dated references, only the edition cited applies. For undated references, the latest edition

of the referenced document (including any amendments) applies.

IEC 81346-1, Industrial systems, installations and equipment and industrial products –

Structuring principles and reference designations – Part 1: Basic rules

ISO 14617-6:2002 Graphical symbols for diagrams – Part 6: Measurement and control

functions
3 Terms and definitions

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

4 Classification principles
4.1 General

The principle of classification of objects is based on viewing each object as a means for

performing an activity often with input and output (see Figure 2). In this respect, the internal

structure of an object is not important.
IEC 1273/09
Figure 2 – The basic concept
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SIST EN 81346-2:2009
81346-2 © IEC:2009 – 9 –

Annex A shows the generic process model used for the establishment of the classification

scheme based on intended purpose or task as shown in Table 1.

An alternative classification according to purpose or task in the special case of an object

regarded as part of an infrastructure is presented in Table 3.

Each class defined in Table 1 is in this standard associated with a set of predefined

subclasses allowing a more detailed characterization of a component, if required.. The

definitions of subclasses of objects are presented in Table 2 together with their associated

letter codes of class and subclass.

NOTE 1 Subclasses do not define a new level in a structure, i.e. they do not describe a subdivision of the object.

Class and subclass refer to the same object.

NOTE 2 The use of subclasses for the coding of technical attributes should be avoided, as this is a separate kind

of information presented in the documentation, for example in a technical specification or in a parts list.

4.2 Assigning objects to classes

For the assignment of objects (i.e. components belonging to the system under consideration)

to classes, the following rules apply:

Rule 1 For the classification of objects according to their intended purpose or task, main

classes and letter codes in accordance with Table 1 or Table 3 shall be applied.

Rule 2 For assigning an object to a class according to Table 1 or Table 3, the object shall

be viewed with respect to its intended purpose or task, as a component in the
system under consideration, without considering the means for implementation
(e.g. the kind of product).

EXAMPLE The desired purpose of an object is “heating”. A possible component required to fulfil this

is a “heater”. According to Table 1, this object is clearly related to class E. It is not of importance, or

simply not known at an early stage of a design process, how the required purpose is realized. This

needed component may be satisfied by using a gas or oil burner or an electric heater (which all may

be products delivered by others). In the case of an electric heater, the heat may be produced by a

product called electric resistor. This product may, in other cases, be classified by its purpose

“restricting a flow” according to class R if that describes it use as a component in those contexts.

It is the component that is classified – not the product used for implementation!

Rule 3 For objects with more than one intended purpose or task, the object shall be

classified according to the intended purpose or task considered to be the main
one.
Table 1 shall only be applied for objects
Rule 4 The class with letter code A according to
with no explicit main purpose or task.

EXAMPLE A flow rate recorder stores measured values for later use but, at the same time, delivers

an output in visible form. If storing is regarded as the main purpose, the object is related to class C

of Table 1. If the indication of measured values is regarded as the main purpose, the object is

related to class P. If the two purposes are considered equally valid, the object is related to class A.

Figure 3 illustrates the principle of assigning classes to objects in the case of a measuring

circuit. The left-hand side illustrates how the requirements are turned into objects with input

and output. On the right-hand side, the used components are shown.
---------------------- Page: 15 ----------------------
SIST EN 81346-2:2009
– 10 – 81346-2 © IEC:2009
Required process activity
Required system object
Different possible realizations
a) Direct measuring and indication
b) Measuring and indication circuit consisting of discrete components
c) One device integrating discrete components
Indicating device
Class P
Transducer
Instrument
Sensor
class T
class P
class B
Indicated,
measured
property
Classification of internal
components is of interest only
Process flow if they are accessible.

d) One device integrating discrete components and for combined purposes; for measuring (primary purpose),

and for indicating (secondary purpose)
IEC 1274/09
NOTE The classes are taken from Table 1.
Figure 3 – Classification of objects in a measuring circuit
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SIST EN 81346-2:2009
81346-2 © IEC:2009 – 11 –
5 Classes of objects
5.1 Classes of objects according to intended purpose or task

Table 1 constitutes the main classification method applicable for any object from any field of

technology.

The most important element in the table is the description of the intended purpose

...

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