IEC81346-2 (2009) Industrial Systems, Installations And .
BS EN 81346-2:2009BSI Standards PublicationBSIIndustrial systems, installationsand equipment and industrialproducts — Structuring principlesand reference designations —Part 2: Classification of objects and codes for classesNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWraising standards worldwide
BRITISH STANDARDBS EN 81346-2:2009National forewordThis British Standard is the UK implementation of EN 81346-2:2009. It isidentical to IEC 81346-2:2009. It supersedes BS EN 61346-2:2001 and DDIEC/PAS 62400:2005, which are withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeGEL/3, Documentation and graphical symbols.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 55512 1ICS 01.110; 29.020Compliance with a British Standard cannot confer immunity fromlegal obligations.BSIThis British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 January 2010Amendments issued since publicationAmd. No.DateText affected
BS EN 81346-2:2009EUROPEAN STANDARDEN 81346-2NORME EUROPÉENNEEUROPÄISCHE NORMOctober 2009ICS 01.110; 29.020Supersedes EN 61346-2:2000English versionIndustrial 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)BSISystèmes industriels, installationset appareils, et produits industriels Principes de structurationet désignations de référence Partie 2: Classification des objetset codes pour les classes(CEI 81346-2:2009)Industrielle Systeme, Anlagenund Ausrüstungen und Industrieprodukte Strukturierungsprinzipienund Referenzkennzeichnung Teil 2: Klassifizierung von Objektenund Kennbuchstaben für Klassen(IEC 81346-2:2009)ZZZ E]I[Z FRPThis European Standard was approved by CENELEC on 2009-08-01. CENELEC members are bound to complywith the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standardthe status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any otherlanguage made by translation under the responsibility of a CENELEC member into its own language and notifiedto the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, theCzech 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.CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral 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
BS EN 81346-2:2009EN 81346-2:2009-2-ForewordThe text of document 3/945/FDIS, future edition 1 of IEC 81346-2, prepared by IEC TC 3, Informationstructures, documentation and graphical symbols, and ISO TC 10, Technical product documentation, wassubmitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 81346-2 on2009-08-01.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 inanother 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 implementedat national level by publication of an identicalnational standard or by endorsement(dop)2010-05-01– latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2012-08-01Annex ZA has been added by CENELEC.BSIZZZ E]I[Z FRPEndorsement noticeThe text of the International Standard IEC 81346-2:2009 was approved by CENELEC as a EuropeanStandard without any modification.
BS EN 81346-2:2009-3-EN 81346-2:2009Annex ZA(normative)Normative references to international publicationswith their corresponding European publicationsThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HDapplies.PublicationYear1)IEC 81346-1-ISO 14617-62002TitleEN/HDYearIndustrial systems, installations andequipment and industrial products Structuring principles and referencedesignations Part 1: Basic rulesEN 81346-12009Graphical symbols for diagrams Part 6: Measurement and control functions--BSIZZZ E]I[Z FRP1)Undated reference.2)Valid edition at date of issue.2)
BS EN 81346-2:2009–2–81346-2 IEC:2009CONTENTSINTRODUCTION.610.1 General .60.2 Basic requirements for this standard .6Scope .82Normative references .83Terms and definitions .84Classification principles .854.1 General .84.2 Assigning objects to classes.9Classes of objects . 115.15.25.3Annex AClasses of objects according to intended purpose or task. 11Subclasses of objects according to intended purpose or task . 17Classes of objects according to infrastructure . 36(informative) Object-classes related to a generic process . 39Annex B (informative) Object-classes related to objects in a generic infrastructure . 41Figure 1 – Constituent objects .7Figure 2 – The basic concept .8BSIFigure 3 – Classification of objects in a measuring circuit . 10ZZZ E]I[Z FRPFigure A.1 – Object-classes related to a process . 39Figure B.1 – Object-classes related to objects in a generic infrastructure. 42Table 1 – Classes of objects according to their intended purpose or task (Codes A to D) . 12Table 1 (continued, codes E to J). 13Table 1 (continued, codes K to P) . 14Table 1 (continued, codes Q to U) . 15Table 1 (continued, codes V to Z) . 16Table 2 – Definitions and letter codes of subclasses related to main classes (Class A) . 18Table 2 (continued, class B) . 19Table 2 (continued, class C) . 20Table 2 (continued, class E) . 21Table 2 (continued, class F). 22Table 2 (continued, class G) . 23Table 2 (continued, class H) . 24Table 2 (continued, class K) . 25Table 2 (continued, class M) . 26Table 2 (continued, class P) . 27Table 2 (continued, class Q) . 28Table 2 (continued, class R) . 29Table 2 (continued, class S) . 30Table 2 (continued, class T). 31
BS EN 81346-2:200981346-2 IEC:2009–3–Table 2 (continued, class U) . 32Table 2 (continued, class V) . 33Table 2 (continued, class W). 34Table 2 (continued, class X) . 35Table 3 – Classes of infrastructure objects . 37BSITable 4 – Examples of branch-related classes B to U of Table 3 . 38ZZZ E]I[Z FRP
BS EN 81346-2:2009–6–81346-2 IEC:2009INTRODUCTION0.1 GeneralThe aim of this part of IEC 81346 is to establish classification schemes for objects withassociated 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, chemicalindustry, building technology, shipbuilding and marine technology. The letter codes areintended for use with the rules for the construction of reference designations in accordancewith IEC 81346-1.Annex A illustrates how objects may be classified according to their intended purpose or taskrelated to a generic process.Annex B illustrates how objects may be classified according to their position in aninfrastructure.0.2Basic requirements for this standardThe basic requirements were developed during the preparation of IEC 61346-2 Ed. 1, andaccepted by vote by the national committees.BSINOTE These basic requirements concern the development of the letter code classification system in this standardand not its application. They are therefore not normative vis-à-vis the application of this standard.ZZZ E]I[Z FRP(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, aclassification scheme for function types containing the definition of the different functiontypes 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 theinstances 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 shallhave a common basis (for example, a classification scheme that, on one level, classifiesobjects according to colour shall not contain classes that classify objects by shape). Thebasis, 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 futuredevelopment and needs.(9)A classification scheme shall be usable within all technical areas without favouring aspecific 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 thetechnical area where it is being used.(11) It should be possible to indicate in a letter code from which technical area the objectoriginates, 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 consistentlythroughout a classification scheme and for different languages.(14) Letter codes shall be formed using capital letters from the Latin alphabet, excluding Iand O due to possible confusion with the digits 1 (one) and 0 (zero).
BS EN 81346-2:200981346-2 IEC:2009–7–(15) Different classification schemes shall be allowed and be applicable for the same type ofobject.(16) Objects may be classified for example according to function types, shapes, colours, ormaterial. This means that the same type of object may be assigned different lettercodes according to the different classification schemes.BSI(17) Objects that are directly constituents of another object using the same aspect shall beassigned letter codes according to the same classification scheme as shown in Figure1. See also Figure A.1.ZZZ E]I[Z FRPIEC1272/09Objects 2, 3, and 4, which are direct constituents of object 1, shall be assigned letter codes from the sameclassification scheme.Objects 5 and 6, which are direct constituents of object 2, shall be assigned letter codes from the sameclassification scheme.Objects 7 and 8, which are direct constituents of object 4, shall be assigned letter codes from the sameclassification scheme.Objects 9, 10, 11, and 12, which are direct constituents of object 6, shall be assigned letter codes from the sameclassification scheme.Objecst 13, 14, 15, and 16, which are direct constituents of object 8, shall be assigned letter codes from the sameclassification scheme.Figure 1 – Constituent objects(18) If products from different manufacturers are combined into a new product, theconstituents of this product may be assigned codes according to different classificationschemes.
BS EN 81346-2:2009–8–81346-2 IEC:2009INDUSTRIAL SYSTEMS, INSTALLATIONSAND EQUIPMENT AND INDUSTRIAL PRODUCTS –STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –Part 2: Classification of objects and codes for classes1ScopeThis part of International Standard 81346, published jointly by IEC and ISO defines classesand subclasses of objects based on a purpose- or task-related view of the objects, togetherwith their associated letter codes to be used in reference designations.The classification is applicable for objects in all technical areas, e.g. electrical, mechanicaland 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 technicaldisciplines in any design process.2Normative referencesBSIThe following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies. For undated references, the latest editionof the referenced document (including any amendments) applies.ZZZ E]I[Z FRPIEC 81346-1, Industrial systems, installations and equipment and industrial products –Structuring principles and reference designations – Part 1: Basic rulesISO 14617-6:2002 Graphical symbols for diagrams – Part 6: Measurement and controlfunctions3Terms and definitionsFor the purposes of this document, the terms and definitions given in IEC 81346-1 apply.44.1Classification principlesGeneralThe principle of classification of objects is based on viewing each object as a means forperforming an activity often with input and output (see Figure 2). In this respect, the internalstructure of an object is not important.IECFigure 2 – The basic concept1273/09
BS EN 81346-2:200981346-2 IEC:2009–9–Annex A shows the generic process model used for the establishment of the classificationscheme 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 objectregarded 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 predefinedsubclasses allowing a more detailed characterization of a component, if required. Thedefinitions of subclasses of objects are presented in Table 2 together with their associatedletter 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 kindof information presented in the documentation, for example in a technical specification or in a parts list.4.2Assigning objects to classesFor the assignment of objects (i.e. components belonging to the system under consideration)to classes, the following rules apply:Rule 1For the classification of objects according to their intended purpose or task, mainclasses and letter codes in accordance with Table 1 or Table 3 shall be applied.Rule 2For assigning an object to a class according to Table 1 or Table 3, the object shallbe viewed with respect to its intended purpose or task, as a component in thesystem under consideration, without considering the means for implementation(e.g. the kind of product).BSIZZZ E]I[Z FRPEXAMPLE The desired purpose of an object is “heating”. A possible component required to fulfil thisis a “heater”. According to Table 1, this object is clearly related to class E. It is not of importance, orsimply not known at an early stage of a design process, how the required purpose is realized. Thisneeded component may be satisfied by using a gas or oil burner or an electric heater (which all maybe products delivered by others). In the case of an electric heater, the heat may be produced by aproduct 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 3For objects with more than one intended purpose or task, the object shall beclassified according to the intended purpose or task considered to be the mainone.Rule 4The cla
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.
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