1、AN AMERICAN NATIONAL STANDARDASME Y14.44-2008Reference Designations for Electrical and Electronics Parts and EquipmentEngineering Drawing and Related Documentation PracticesASME Y14.44ADOPTION NOTICEASME Y14.44, Reference Designations for Electrical and Electronics Parts and Equipment, was adopted o
2、n22 July 2008 for use by the Department of Defense (DoD). Proposed changes by DoD activities must be submittedto the DoD Adopting Activity: Commander, U.S. Army Research, Development and Engineering Center (ARDEC),ATTN: AMSRD-AAR-QES-E, Picatinny Arsenal, NJ 07806-5000. Copies of this document may b
3、e purchased fromThe American Society of Mechanical Engineers (ASME), 22 Law Drive, P.O. Box 2900, Fairfield, NJ 07007-2900,http:/www.asme.org.Custodians: Adopting Activity:Army AR Army ARNavy SAAir Force 16 (ProjectDRPR-2008-003)Review Activities:Army CR, IE, MI, PT, TM2Navy AS, CG, CH, EC, MC, NP,
4、TDAir Force 13, 99DLADHOSDSENSANSOther CM, MP, DC2NOTE: The activities listed above were interested in this document as of the dateof this document. Since organizations and responsibilities can change, you shouldverify the currency of the information above using the ASSIST Online databaseat http:/as
5、sist.daps.dla.mil.AMSC N/A AREA DRPRDISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.ASME Y14.44-2008Reference Designationsfor Electrical andElectronics Partsand EquipmentEngineering Drawing and RelatedDocumentation PracticesAN AMERICAN NATIONAL STANDARDDate of Issuan
6、ce: November 21, 2008The next edition of this Standard is scheduled for publication in 2013. There will be no addenda orwritten interpretations of the requirements of this Standard issued to this edition.Periodically certain actions of the ASME Y14 Committee may be published as Cases. Cases arepubli
7、shed on the ASME Web site under the Committee Pages at http:/cstools.asme.org as they areissued.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards. The
8、 Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate. The proposed code or standard was madeavailable for public review and comment that provides an opportunity for additional publ
9、ic input from industry, academia,regulatory agencies, and the public-at-large.ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems m
10、entioned in this document, and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights, a
11、nd the risk of infringement of such rights, isentirely their own responsibility.Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those in
12、terpretations of this document issued in accordance with the establishedASME procedures and policies, which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permiss
13、ion of the publisher.The American Society of Mechanical EngineersThree Park Avenue, New York, NY 10016-5990Copyright 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the Y14 Committee vi1 General . 12 Un
14、it Numbering Method 33 Location Numbering Method 114 Location Coding Method 135 Designation of Deposited Components on Hybrid Printed Circuits . 176 Marking on Equipment . 177 Class Designation Letters. 19Figures1 Typical Basic Reference Designations in a Diagram 32 Socket Reference Designations and
15、 Markings 43 Reference Designation in a Typical Schematic Diagram 54 Connector Designations for Plug-In Items . 65 Typical Connector and Interunit Cable Designation 76 Physical and Circuit Relationship of N-Designated Circuit Groups . 77 Typical System Subdivision . 98 A Typical Set . 99 Identificat
16、ion of Subassemblies and Parts of Units . 1010 Identification of Items of Subassemblies . 1111 Application of Reference Designations to a Unit . 1112 Intermixture of Unit Numbering Method and Location Numbering Method in theSame Unit . 1213 Typical First-Level Coordinate Number Assignment . 1214 Use
17、 of Suffix Letter to Locate Surfaces 1315 Location Numbering Applied at Several Subdivision Levels . 1416 Coordinate First-Level Breakdown 1517 Sequential-Type, First-Level Breakdown . 1618 Location Coding of Multiple Levels of Equipment . 1619 Coding of Panels . 1720 Identifiable Rows and Columns .
18、 1721 Designation of Deposited Components on Hybrid Printed Circuits . 18Nonmandatory AppendixA Block Numbering Method 21iiiFOREWORDThis Standard establishes the requirements for the generation and application of referencedesignations for electrical and electronics parts and equipment. All informati
19、on contained in thisStandard was documented in IEEE Std 200 (ANSI Y32.16), which was previously withdrawn.Due to the need for this Standard in the industry, it was agreed that it should be reestablishedby ASME and a new subcommittee (Subcommittee Y14.44) was formed to carry out the develop-ment ofa
20、newstandard under theASME Y14series of engineeringdrawing andrelated documen-tation practices.The following is a summary of the significant changes that were made to the previous IEEEStd 200 Standard and incorporated into this Standard:(a) Reformatted document per the requirements contained in The A
21、SME Codes and StandardsWriting Guide 2000.(b) Figure 8 (formerly, Fig. 3) was revised as follows: A7J2 and A9J2 were changed to reflecta male connector with the appropriate symbology per IEEE Std 315A. W2P1 and W3P1 werechanged to reflect a female connector with the appropriate symbology per IEEE St
22、d 315A.(c) Revised Fig. 3 (formerly, Fig. 8) to reflect the appropriate symbology per IEEE Std 315A.(d) Corrected location code and reference designation breakdown in Fig. 17.Was:12D5B6/Q3Is:12D6B5/Q3(e) Deleted section 10.(f) Deleted Appendix B.Where this Standard is specified as a requirement in a
23、 document, its defined requirements areassumed to be consistent with the needs of the user. Therefore, each user provides appropriateinterpretations, as the need arises, consistent with the environment in which it is applied.The successful generation of this Standard is attributed to the subcommitte
24、e members andtheir respective companies and the department and agencies of the U.S. Government.Suggestions for improvement of this Standard are welcome. They should be sent to TheAmerican Society of Mechanical Engineers, Secretary, Y14 Standards Committee, Three ParkAvenue, New York, NY 10016-5990.T
25、his Standard was approved as an American National Standard on July 3, 2008.ivASME Y14 COMMITTEEEngineering Drawing and Related DocumentationPractices(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSF. Bakos, Jr., ChairK. E. Wiegandt,
26、 Vice ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELA. R. Anderson, Dimensional Control Systems, Inc.F. Bakos, Jr., ConsultantJ. V. Burleigh, ConsultantD. E. Day, Tec-Ease, Inc.K. Dobert, UGS PLM SolutionsC. W. Ferguson, WM Education ServicesC. J. Gomez, The American Society of Mechanical
27、EngineersB. A. Harding, Purdue UniversityD. H. Honsinger, ConsultantW. A. Kaba, Spirit AeroSystemsK. S. King, BAE SystemsA. Krulikowski, Effective Training, Inc.P. J. McCuistion, Ohio UniversityJ. D. Meadows, James D. Meadows for correlating items ina set; graphic symbols on diagrams; and items in p
28、artslists, circuit descriptions, and instructions.ThisStandardincludesthreemethodsforformingandapplying reference designations.(a) the unit numbering method(b) the location numbering method(c) the location coding methodA complete reference designation may incorporatereference designations formed by
29、the use of any of thesemethods at any level from basic parts to complete units.The unit numbering method has a long history ofsatisfactory use in all types of electrical and electronicsequipment. The location numbering method and loca-tion coding method have been developed to permit arapid physical
30、location of items in large, complicatedequipment featuring multiple use of many identical orclosely similar items. These methods shall be applied insuch a way that duplicate complete reference designa-tions do not occur in a piece of equipment or system.Device function designations for power switchg
31、earand industrial control use are not covered by thisStandard.1.2 ApplicationThe reference designations of this Standard are foruseonequipmentandrelateddiagrams,drawings,partslists, and in manuals or similar publications. Referencedesignationsarenotintendedtoreplaceotheridentifica-tionnumbers,suchas
32、drawing,part,type,orstocknum-bers. Additions or changes to an existing unit or setshould follow the designation system originally used.In this Standard, the unit is the highest level to whicha reference designation is assigned.1.3 References to This StandardIf this Standard is referenced in a contra
33、ct or order,the following should be specified:(a) title, number, and date.1(b) the reference documents that are to govern, whereapplicable (e.g., American National Standards orMilitary Standards). See para. 1.6.(c) marking of reference designations on product(whether required or not). See section 6.
34、1.4 Changes in Reference Designation Class LettersIf changes in the state-of-the-art appear to makechangedornewreferencedesignationclasslettersneces-sary, provide the following information:(a) item for which new designation is requested, typeor class of item, and frequency of use (per drawing, perse
35、t, etc.)(b) present reference designation used(c) proposed reference designation(d) reasons for recommending a change (supplysource material, if feasible)(e) graphic symbolAddress comments to The American Society ofMechanical Engineers, Secretary, Y14 StandardsCommittee, Three Park Ave., New York, N
36、Y 10016, andrefer to this Standard.1.5 Use of “Shall,” “Should,” and “May”In this Standard, the word “shall” is to be understoodas a requirement; the word “should” as a recommenda-tion; andthe word “may”as permissive,neither manda-tory nor recommended.1.6 ReferenceThe following revisions of American
37、 NationalStandards form a part of this Standard to the extentspecified herein. A more recent revision may be used,provided there is no conflict with the text of thisStandard. In the event of a conflict between the text ofthis Standard and the references cited herein, the textof this Standard shall t
38、ake precedence.IEEE Std 315-1975, Graphic Symbols for Electrical andElectronics DiagramsPublisher: Institute of Electrical and ElectronicsEngineers (IEEE), 445 Hoes Lane, Piscataway, NJ08855-4141ASME Y14.44-20081.7 Definitionsaccessory: a basic part, subassembly, or assemblydesigned for use in conju
39、nction with or to supplementanother assembly, unit, or set contributing to the effec-tiveness thereof without extending or varying the basicfunction of the assembly or set. An accessory may beusedfortesting,adjusting,orcalibratingpurposes.Typi-cal examples are test instrument, recording camera forra
40、dar set, headphones, and emergency power supply.assembly: a number of basic parts or subassemblies, orany combination thereof, joined together to perform aspecificfunction.Typicalexamplesareelectricgenerator,audiofrequency amplifier, and power supply.NOTES:(1) The application, size, and construction
41、 of an item may be fac-tors in determining whether an item is regarded as a unit, anassembly, asubassembly, ora basicpart. Asmall electricmotormight be considered as a part if it is not normally subject todisassembly.(2) The distinction between an assembly and a subassembly is notalways exact; an as
42、sembly in one instance may be a subassem-bly in another where it forms a portion of an assembly.assembly, microelectronic device: an assembly of insepara-ble parts, circuits, or combination thereof. Typical exam-ples are microcircuit, integrated circuit package, andmicromodule.attachment: a basic pa
43、rt, subassembly, or assemblydesigned for use in conjunction with another assembly,unit, or set, contributing to the effectiveness thereof byextending or varying the basic function of the assembly,unit,or set.A typicalexampleis UHFconverter forVHFreceiver.basic part: one piece or two or more pieces j
44、oinedtogether, which are not normally subject to disassemblywithout destruction of designed use. Typical examplesare electron tube, resistor, relay, power transformer, andmicroelectronic device.functional designation: words, abbreviations, or meaning-ful numbers-letter combinations, usually derived
45、fromthe function of an item (e.g., slew, yaw), used on draw-ings, instructional material, and equipment to identifyan item in terms of its function. (A functional designa-tionisnotareferencedesignationnorasubstituteforit.)group: a collection of units, assemblies, or subassembliesthat is a subdivisio
46、n of a set or system, but that is notcapable of performing a complete operational function.Typical examples are antenna group and indicatorgroup.microelectronic device: an item of inseparable parts andhybrid circuits usually produced by integrated circuittechniques. Typical examples are microcircuit
47、, inte-grated circuit package, and micromodule.reference designation: letters, numbers, or both used toidentify and locate discrete units, portions thereof, and2basic parts of a specific set. (A reference designation isnot a letter symbol, abbreviation, or functional designa-tion for an item.)basic
48、reference designation: the simplest form of a refer-ence designation consisting only of a class letter portionand a number (namely, without mention of the itemwithin which the reference-designated item is located).complete reference designation: a reference designationthat consists of a basic refere
49、nce designation and, asprefixes, all the reference designations that apply to thesubassemblies or assemblies within which the item islocated, including those of the highest level needed todesignate the item uniquely.partialreferencedesignation:areferencedesignationthatconsists of a basic reference designation and which mayinclude, as prefixes, some but not all of the referencedesignations that apply to the subassemblies or assem-blies within which the item is located.NOTE: The reference designation for a unit consists of only anumber.relay:anelectricallycontrolled(usu
