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ANSI Y32.2-1975
CSA Z99·1975
IEEE Std 315-1975
Revision of
ANSI Y32.2-1972
CSA Z99-1972
IEEE Std 315-1971
American National Standard
Canadian Standard
IEEE Standard
Graphic Symbols for
Electrical and Electronics Diagrams
(Including Reference Designation Letters)
IEEE Standards Coordinating Committee 11, Graphic Symbols
Secretariat for American National Standards Committee Y32
American Society of Mechanical Engineers
Institute of Electrical and Electronics Engineers
Approved October 31,1975
American National Standards Institute
Approved October 9, 1975
Canadian Standards Association
Approved September 4, 1975
Institute of Electrical and Electronics Engineers
Adopted for Mandatory Use October 31,1975
Department of Defense, United States of America
Approved September 4, 1975
IEEE Standards Board
Warren H. Cook, Vice Chairman
Joseph L. Koepfinger, Chairman
Sava I. Sherr, Secretary
Jean Jacques Archambault
Robert D. Briskman
Dale R. Cochran
Louis Costrell
Frank Davidoff
Jay Forster
Irvin N. Howell. Jr
Stuart P. Jackson
Irving Kolodny
William R. Kruesi
Benjamin J. Leon
Anthony C. Lordi
Donald T. Michael
Voss A. Moore
William S. Morgan
William J. Neiswender
Gustave Shapiro
Ralph M. Showers
Robert A. Soderman
Leonard Thomas
Charles L. Wagner
William T. Wintringham
The individual symbols contained in this standard may be copied, reproduced,
or employed in any fashion without permission of the IEEE. Any statement that
the symbols used are in conformance with this standard shall be on the user's own
© Copyright 1975 by the Institute of Electrical and Electronics Engineers, Inc. No part of this
publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.
September 1988 Printing
(This foreword is not a part of American National Standard Graphic Symbols for
Electrical and Electronics Diagrams, Y32.2-1975 [IEEE Std 315-1975])
This American National Standard is a revision and expansion of American National Standard
Graphic Symbols for Electrical and Electronics Diagrams, Y32.2-1970 (IEEE Std 315-1971).
A variety of specialized symbols originally used for aircraft applications have been added to make
this standard more comprehensive. To improve coordination with IEC pUblication 117, IEC approved versions of capacitor, transformer, delay, associated conductors and specialized ground
symbols have been added as alternates to those long used and standardized in the United States. A
num ber of small changes have made the existing material more closely parallel to IEC Publication
117. Symbols have been added to cover additional devices in the photo sensitive semiconductor and
specialized semiconductor fields, as well as for an electronic flash lamp. Known errors have been
corrected and some items have been clarified.
The reference designation class letters were revised to include the added new device symbols and
to clarify the DS and LS categories. "D" is now listed as an alternate to the common "CR" for the
common semiconductor diode family of devices.
All of the symbols are designed so that their connection points fall on a modular grid. This should
help those who use a grid basis for the preparation of diagrams. By proper enlargement of the
symbols the usual coordinate-grid sizes can be matched. Most symbols appearing in this standard
were reproduced from original drawings prepared for the Mergenthaler Diagrammer.
A substantial effort has been made to have this American National Standard compatible with
approved International Electronical Commission (lEC) Recommendations (lEC Publication 117, in
various parts). Electrical diagrams are a factor in international trade; the use of one common symbol
language ensures a clear presentation and economical diagram preparation for a variety of users.
Members of the preparing committee have been active in transmitting USA viewpoints to the
cognizant IEC Technical Committee.
Alternative symbols are shown only in those cases where agreement on a common symbol could
not be attained at this time. It is hoped that the number of alternative symbols will be reduced in
future editions.
The symbols in this standard represent the best consensus that can be attained at this time.
Standardization, however, must be dynamic, not static, and any solution of a problem should be
tested through use and revised if necessary. It is anticipated that the contents of this standard will
be modified as future needs dictate; such modifications will be made available through the issuance
of approved supplements. Suggestions for improvement are welcomed. They should be addressed
Secretary, IEEE Standards Board
Institute of Electrical and Electronics Engineers, Inc.
345 East 47 Street
New York, N.Y. 10017