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USAS Yl4.l5· 1966
Including
PROPOSED USA STANDARD
FOR CONNECTION DIAGRAMS
AND TERMINAL DIAGRAMS
(REAFFIRMED 1973)
Spon:Jor:J
American Society for Engineering Education
The American Soc i ety of Mechanical Engineers
THE
AMER(CAN
SOCIETY OF
United Engineering Center
MECHANICAL
345 East 47th Street
ENGINEERS
New York, N. Y. 10017
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ELECTRICAL AND
ELECTRONICS DIAGRAMS
USAS Y14.15 - 1966
USA STANDARD APPROVED includes the following:
15-1
15-2
15-3
15-4
15-5
15-6
15-7
15-8
15-9
Scope
Definitions
General Infonnation
Single-Line Diagrams, General
Single-Line Diagrams (Electronics and Communications)
Single-Line Diagrams (Power Switchgear and
Industrial Control)
Schematic Diagrams, General
Schematic Diagrams (Electronics and Communication)
Schematic Diagrams (Power Switchgear and
Industrial Control)
PROPOSED USA STANDARD includes the following:
15-10 Connection Diagrams
15-12 Terminal Diagrams
This USA Standard is one of nearly 3000 standards approved as American Standard by the American Standards Association. On August 24, 1966, the ASA was
reconstituted as the United States of America Standards Institute. Standards approved as American Standard are now designated USA Standards. There is no
change in their index identification or technical content.
Second Printing: July 1969
UDC 621.7:744
Copyright © 1966
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
Printed in U.S.A.
Foreword
r
Subcommittee 15 - Electrical and Electronic Diagrams - was formed on April
26, 1964, as a subcommittee of Sectional Committee Yl4-Standards for Drawings and Drafting. When formed, this subcommittee was charged with the responsibility of preparing a drafting standard covering "electrical schematic, wiring and
block diagrams for use in the communications, electronic, electric power, industrial control, telephone, telegraph and allied industries." A natural addition to
this scope was the inclusion of military considerations through participation by
re-presentatives of the Department of Defense.
The creation of such a standard, acceptable to the manufacture of electrical
equipment and to industrial, military and utility users, often in areas which were
themselves undergoing development, has been an exercise in cooperation and
compromise. The overriding purpose of all of the participants has been to issue
a single USA standard which could be used as a reference in purchasing
equipment, cited as authority in contract and military specifications and applicable as a guide for drafting and design personnel responsible for drawings for
production or for use wholly within a plant or company.
For this standard to be so widely applicable it had to be made broad and permissive; therefore compromise was essential, particularly in terminology, but
such compromise had the beneficial effect of expediting its issue and of making
it generally available. We hope its effect is to unify drafting practices and that
future revisions will refl~ct increasing uniformity by eliminating multiple options
and establishing preferred methods and nomenclature.
Paragraphs 15-1 to 15-9 inclusive were approved by the Sectional Committee,
the sponsors and the USA Standards Institute, and were designated USA Standard
on December 2, 1966.
Paragraphs 15-10 and 15-12 were approved by the Sectional Committee
on July 20, 1966 for issue on a trial basis to provide an opportunity for industry
to comment before final adoption of these paragraphs as a USA Standard. If this
standard if referred to, all paragraphs (including 15-10 and 15-12) apply unless
specific exception are indicated.
iii
Sectional Committee Y14,
Standards for Drawings and Drafting Practice
OFFICERS
F. L. Spalding, Chairman
C. H. Keams, Secretary
SECTIONAL COMMITTEE
AMERICAN INSTITUTE FOR DESIGN AND DRAFTING
T. J. Annstrong, International Business Corp., Poughkeepsie, N. Y.
AMERICAN SOCIETY OF CIVIL ENGINEERS
J. W. Guppy, U.S. Steel Corp., New York, N. Y.
AMERICAN SOCIETY FOR ENGINEERING EDUCATION, THE
R. W. Bokenkamp, University of Illinois, Urbana, Illinois
C. H. Kearns, Ohio State University, Columbus, Ohio
W. J. Luzadder, Purdue University, West Lafayette, Indiana
R. S. Paffenbarger, Ohio State University, Columbus, Ohio
H. C. Spencer, Waco, Texas
C. H. Springer, N. Fort Myers, Florida
C. L. Svensen, Austin, Texas
C. J. Vierck, Jupiter, Florida
AMERICAN SOCIETY OF HEATING, REFRIGERATING & AIR CONDITIONING ENGINEERS
Fritz Homerkamp, Anemostat Corp. of America, Scranton, Pa.
J. J. Donovan, Alternate, Carrier Corp., Syracuse, N. Y.
H. P. Tinning, Alternate, American Society of Heating, Refrigerating & Air Conditioning Engineers, New York, N.Y.
AMERICAN SOCIETY OF MECHANICAL ENGINEERS, THE
N. L. Bean, Dearborn, Michigan
A. R. Machell, Xerox Corp., Rochester, N. Y.
F. L. Spalding, University of Illinois, Urbana, Illinois
AMERICAN SOCIETY OF TOOL & MANUFACTURING ENGINEERS
Joe Penn, Indianapolis, Indiana
ASSOCIATION OF AMERICAN RAILROADS
M. F. McCorcIe, St. Louis-San Francisco Railway, Springfield, Missouri
BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION
W. T. Barton, International Business Machines Corp., Endicott, N. Y.
ILLUMINATING ENGINEERING SOCIETY
L. E. Barbrow, National Bureau of Standards, Washington, D. C.
C. L. Crouch, Alternate, Illuminating Engineering Society, New York, N. Y.
INSTITUTE OF ELECTRICAL & ELECTRONICS ENGINEERS, THE
F. P. Kuhl, Consolidated Edison Co. of N. Y., Inc., New York, N. Y.
C. R. Muller, ITT Federal Laboratories, Clifton, N. J.
MANUFACTURERS CHEMISTS' ASSOCIATION, INC.
J. E. Ross, E. I. duPont de Nemours & Co., Inc., Wilmington, Delaware
MANUFACTURERS GROUP
E. H. Koenig, Keuffel & Esser Co., Hoboken, N.j.
MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE & FITTINGS INDUSTRY
R. V. Warrick, Manufacturers Standardization Society of the Valve & Fittings Industry, New York, N. Y.
NATIONAL ELECTRICAL MANUF ACTURERS ASSOCIATION
C. H. Bayer, General Electric Co., Schenectady, N. Y.
L. D. Price, Alternate, National Electrical Manufacturers Association, New York, N. Y.
NATIONAL FLUID POWER ASSOCIATION
J. L. Fisher, Jr., Bellows-Valvair, Akron, Ohio
NATIONAL MACHINE TOOL BUILDERS' ASSOCIATION
L. G. Glesmann, Gleason Works, Rochester, N. Y.
SOCIETY OF AUTOMOTIVE ENGINEERS
Joe Stannard, Pratt & Whitney Aircraft, E. Hartford, Connecticut
R. P. Trowbridge, General Motors Technical Center, Warren, Michigan
J. A. Boxall, Alternate, Detroit, Michigan
SOCIETY OF NAVAL ARCHITECTS & MARINE ENGINEERS
G. R. Daniels, Quincy, Massachusetts
'
iv
TELEPHONE GROUP, THE
R. ]. Harazin, Western Electric Co., Inc., Chicago, Illinois
C. H. Heller, Bell Telephone Laboratories, Inc., Murray Hill, N.].
G. Sawyer, Alternate, Bell Telephone Laboratories, Murray Hill, N.].
TRADE AND HIGH SCHOOL GROUP
Frank Scott, Belleville Junior College, Belleville, Illinois
DEPT. OF THE ARMY
C. A. Nazian, liaison, Ordnance, Frankford Arsenal, Philadelphia, Pa.
A. J. Stitzel, Alternate, Ordnance, U.S. Army Materiel Command, Washington, D. C.
DEPT. OF COMMERCE
D. M. Mills, Patent Office, Washington, D. C.
DEPT. OF THE NAVY
Code 609.3C, liaison, Bureau of Ships, Washington, D. C.
S. C. Miller, liaison, Bureau of Naval Weapons, Washington, D. C.
]. E. Walter, Alternate, Bureau of Naval Weapctns, Washington, D. C.
INDIVIDUAL MEMBERS
R. F. Franciose, General Electric Co.
C. A. Slater, Bendix Corp., Kansas City, Missouri
Personnel of Subcommittee 15 on Electrical and Electronic Diagrams
CHAIRMEN
S. H. Horowitz, Chairman, Y14.15, American Electric Power Service Corp., New York, N.Y. 10008
C. R. Muller, Chairman, Task Group, No.1, ITT Federal Laboratories, Nutley, New Jersey
W. C. Fulton, Chairman, Task Group, No.2, Westinghouse Electric Corp., East Pittsburgh, Pa.
J. J. O'Farrell, Jr., Chairman, Task Group, No.3, International Business Machines Corp., Armonk, N. Y.
TASK GROUP NO. 1 - MEMBERS
S. Alvine, ]r., Kearfott Div., General Precision, Inc., Little Falls, N.}.
V. W. Bennett, Chairman, Bell Telephone Laboratories, Inc., New York, N. Y.
D. C. Bowen * (Chairman Y14.15 1954-1959), Radio Corporation of America, Camden 2, New} ersey
S. Campagna (1954-1961), Sylvania Electric Products, Inc., Buffalo, N. Y.
V. W. Chabal, Radio Corporation of America, Camden, N.].
E. M. Eckhardt, Tawl-Ned, Picatinny Arsenal, Dover, N.}.
C. ]. Eiwen t, American Machine and Foundry Co., Alexandria, Va.
C. A. Fricke, Philco Corp., Tech. Rep. Div., Ft. washington, Pa.
]. M. Glass t, Hughes Aircraft Co., Culver City, Calif.
L. Green, Raytheon Company, Wayland, Mass.
]. L. Kallas, Bell Telephone Laboratories, Inc., Whippany Road, Whippany, N.} •
G. A. Knapp, General Electric Co., Utica, N. Y.
]. Kovac (1954-1963), Bell Telephone Laboratories, Whippany, N. J.
R. C. Luca (1963-1965), Sperry Gyroscope Co., Great Neck, Long Island, N. Y.
L. A. Meadows, Dept. of the Navy, Bureau of Ships, Washington, D.C.
V. C. Meigs t, North American Aviation, Inc., Anaheim, Calif.
E. Miller, Westinghouse Electric Corp., Baitimpre, Md.
A. T. NintzeI * (1955-1963), Sperry Gyroscope Co., Great Neck, Long Island, N. Y.
O. I. Nordrum, U.S. Army Electronics Laboratories, Ft. Monmouth, N. J.
B. N. Orr, Procurement and Production, Hq, U. S. Army Electronics Command, Ft. Monmouth, N.}.
T. T. Robertson t, Sandia Corp., Alburquerque, N. M.
*
*
*
tCorresponding Member
*Past Members
v
TASK GROUP NO.2 - MEMBERS
H. C. Barnes t, American Electric Power Service Corp., New York, N. Y. 10008
S. C. Ewing, General Electric Co., Salem, Virginia
R. B. Harvey, Ebasco Services, New York, New York 10006
W. L. Healy, USA Standards Institute, New York, N. Y. (formerly with General Electric Co., Philadelphia, Pa.)
J. P. Houck, Westinghouse Electric Corp., East Pittsburgh, Pa.
L. L. MacDonald, Public Service Electric & Gas Co., Newark 1, New Jersey
L. E. Markle t, Westinghouse Electric Corp., Buffalo, New York
J. J. Moyer, Bureau of Ships, Washington, D. C.
H. Muller t, American Electric Power Service Corp., New York, New York 10008
D. L. Pierce, Westinghouse Electric Corp., Buffalo, New York
D. A. Roberson t, TSE, ARO Inc., Tullahoma, Tenn.
R. E. Seddon *, (formerly Chairman), E. I. duPont de Nemours & Co., Wilmington, Delaware
K. R. Walch, General Electric, Phi ladelphia, Pa.
J. Youngblood t, Detroi t Edison Co., Detroit, Michigan
t Corresponding Member
* Past Members
vi
Contents
Page
15-1 Scope . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . ..
15-2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15-2.1 Single-Line or One-Line Diagram ••••••••••••••••••••
15-2.2 Schematic or Elementary Diagram ••••••••••••••••••••
15-2.3 Connection or Wiring Diagram ••••••••••••••••••••••
15-2.4 Interconnection Diagram ••••••••••••••••••••••••••
15-2.5 Terminal Diagram ••••••••••••••••••••••••••••••
15-2.6 Other Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15-3 General Information ••••••••••••••••••••••••••••••••
15-3.1 Other Reference Standards ••••••••••••••••••••••••
15-3.2 Diagram Titles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15-3.3 Combined Forms of Diagrams ••••••••••••••••••••••
15-3.4 Drawing Size and Format •••••••••••••••••••••••••
15-3.5 Line Conventions and Lettering •••••••••••••••••••••
15-3.5.1 Lower Case Letters •••••••••••••••••••••••••
15-3.6 Graphic Symbols •••••••••••••••••••••••••••••••
15-3.6.1 Representation of Electrical Contacts •••••••••••••
15-3.7 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . • .
15-3.8 Layout of Diagrams •••••••••••••••••••••••••••••
15-3.8.1 Grouping of Parts •••••••••••••••••••••••••••
15-3.9 Drawing Number Reference Location ••••••••••••••••••
15-3.10 Diagram Revisions ••••••••••••••••••••••••••••
15-3.11 Color Information •••••••••••••••••••••••••••••
15-4 Single-Line Diagrams, General •••••••••••••••••••••••••
15-5 Single-Line Diagrams (Electronics and Communications) ••••••••
15-6 Single-Line Diagrams (Power Switchgear and Industrial Control) .••
15-6.1 General Information •••••••••••••••••••••••••••••
15-6.2 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15-6.2.1 Ratings •••••••••••••••••••••••••••••••••
15-6.2.2 Winding Connection Symbols ••••••••••••••••••••
15-6.2.3 Neutral and Ground Connections •••••••••••••••••
15-6.2.4 Feeder Circuits ••••••••••••••••••••••••••••
15-6.2.5 Protective Relaying •••••••••••••••••••••••• '.
15-6.2.6 Instruments, Meters and Associated Switches •••••••••
15-6.2.7 Power Circuit Breaker Mechanism ••••••••••••••.•
15-6.2.8 Ratios of Instrument Transformers ••••.•••••••••••
15-6.3 General Layout •••••••••••••••••••••••••••••••
15-6.3.1 Graphic Symbols •••••••••••••••••••••••••••
15-6.3.2 Abbreviations •••••••••••••••••••••••••••••
15-6.3.3 Device Designations •••••••••••••••••••••••••
15-6.3.4 Course of Main Circuits •••••••••••••••••••••••
15-6.3.5 Horizontal and Vertical •••••••••••••••••••••••
15-6.3.6 Voltage Arrangement •••••••••••••••••••••••••
15-6.4 Typical Single-Line Diagrams ••••••••••••••.•••••••
15-7 Schematic Diagrams, General ••••••••••••••••••••••••••
15-7.1 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15-7.2 Connecting Lines ••••••••••••••••••••••••••••••
15-7.2.1 Spacing •••••••••••••••••••••••••••••••••
15-7.2.2 J unctions and Crossovers •••••••••••••••••••••
15-7.3 Interrupted Paths ••••••••••••••••••••••••••••••
15-7.3.1 Interrupted Single Lines ••••••••••••••••••••••
15-7.3.2 Interrupted Grouped Lined •••••••••••••••••••••
15-7.4 Mechanical Linkages ••••••••••••••••••••••••••••
15-8 Schematic Diagrams (Electronics and Communication) ••••••••••
15-8.1 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . .
15-8.2 Drawing Zones . . . . . . . . . . . . • . • . . . . . . . . . . . . . . . . .
15-8.3 Circuit Return and Connection Symbols ••••••••••••••••
15-8.4 Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15.8.4.1 Identification of Terminals (General) ••••••••••••••
15-8.4.1.1 Adjustable Resistor Terminal Identification ••••••
15-8.4.1.2 Switch Terminals and Circuit Functions •••••••••
vii
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Page
15-S.4.1.3 Electron Tube Pin Identification ••••••••••••••
15-S.4.1.4 Connector Coaxial Contact Identification ••••••••
15-S.4.1.5 Integral Cir~uit Package, Circuit Pack orSubassembly
15
15
Terminations •••••••••••••••••••••••••••
15
15-S.4.1.6 Circuit Pack Representation in Overall and Other
Schematic Diagrams ••••••••••••••••••• • •
15-S.5 Division of Parts ••••••••••••••••••
15-S.5.1 Identification of Parts by Suffix Letter ••••••••
15-S.5.2 Identification of Rotary Switch Parts •••
15-S.5.3 Iden tification 0 f Portions of Items ••••
15-S.5.4 Identification of Individual Terminals of Parts.
15-8.5.5 Detached Contact (Contact Separation) Methods
15-S.6 Reference Designations.
15-S.6.1 Letters •••••••
15-8.6.2 Numbers ••••••••
15-S.6.3 Type Designations ••
15-S.7 Numerical Values.
15-S.7.1 Commas....
15-S.7.2 Resistance.
15-S.7.3 Capacitance
15-S.7.4 Inductance •
I 5-S. 7.5 Notes •••••
15-S.7.6 Numerical Value and Reference Designation Placement
15-S~S
Functional Identification of Parts.
• •••••
15-S.9 Test Points ••••••••••••••••••••••
15-S.10 Additional Circuit Information •••••••••
15-S.10.1 Partial Reference Designation Prefix
15-S.ll Examples of Schematic Diagrams for a Complete Item
15-S.12 Single-Line Diagrams for Microwave Circuits
15-S.12.1 Transmission Path Recognition Symbol.
15-S.12.2 Connector and Flange Symbols •
15-S.12.3 DC Continuity and Discontinuity
15-S.12.4 Pressure Seals •••••••••••
15-S.12.5 Subassemblies ••••••••••••
15-9 Schematic Diagrams (Power Switchgear and Industrial Control)
15-9.1 Contents . . . . . . . . . . . . . . . . . . • • • • • •
15-9.1.1 Device Ratings (Fuses, Resistors, etc.)
15-9.1.1.1 Rating Location••••
,
15-9.1.1.2 Current Transformers ••••
15-9.1.2 Explanatory Notes ••••••••••
15-9.1.3 Wire and Terminal Designations
15-9.1.3.1 Designation Location ••
15-9.1.4 Wire Designations •••••••••
15-9.1.4.1 Designations Denoting a Function.
15-9.1.4.2 De~ignations Denoting Location ••
15-9.1.4.3 Assigned (Wire) Designations •••••
15-9.1.5 Terminal Designations ••••••••••••
:15-9.1.5.1 Interconnecting Unrelated Terminal Designations.
15-9.1.6 Mechanism End of Power Circuit Breaker
15-9.2 General Layout ••••
15-9.2.1 Graphic Symbols •••••••••
15-9.2.2 Abbreviations •••••••••••
15-9.2.3 Device Function Designations
15-9.2.3.1 Device Function Designations for Power Switchgear.
15-9.2.3.2 Device Function Designations for Industrial Control.
15-9.2.4 Device Contacts •••
15-9.2.5 Circuit Arrangements ••
15-9.2.6 Control Sources ••••••
15-9.2.7 Physical Relationship.
15-9.2.S Course of Circuit ••••
15-9.2.9 Horizontal and Vertical Lines ••
15-9.2.10 Phasing Indications ••
15-9.2.11 Polarity Indication ••••
15-9.3 Typical Schematic Diagrams ••
viii
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IS
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IS
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IS
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Proposed Contents
Page
15-10 Connection Diagrams • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 39
15-10.1 Purpose . . . . . . . . . . . . . . . . . . . • . . . . . • . . . . . . . .. 39
15-10.2 Types . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . -. . . .. 39
15-10.2.1 Continuous-Line Type. • • • • • • • • • • • • • • • • • • • • •• 39
15-10.2.2 Interrupted-Line Type • • • • • • • • • • • • • • • • • • • • • • • 39
15-10.2.3 Tabular Type. • • • • • • • • • • • • • • • • • • • • • • • • • • •• 39
15-10.3 Common Requirements • • • • • • • • • • • • • • • • • • • • • • • • •• 39
15-10.3.1 Equipment Views • • • • • • • • • • • • • • • • • • • • • • • • •• 39
15-10.3.2 Principal and Auxiliary Wiring View Selection ••••••• 39
15-10.3.3 Representation of Component Devices and Parts. • • • •• 41
15-10.3.4 Component Devices or Parts Symbol Size. • • • • • • • • •• 41
15-10.3.5 Terminals.... • • • • • • • • • • • • • • • • • • • • • • • • • •• 41
15-10.3.5.1 Perpendicular Planes • • • • • • • • • • • • • • • • • • •• 42
15-10.3.5.2 Terminal Boards or Strips ••••••••••••••••• 42
15-10.3.6 Arrangement of Component Devices or Parts ••••••••• \ 42
15-10.3.6.1 Critical Location. • • • • • • • • • • • • • • • • • • • • •• 42
15-10.3.7 Equipment Device or Part Orientation. • • • • • • • • • • •• 42
15-10.3.8 Designations... • • • • • • • • • • • • • • • • • • • • • • • • •• 42
15-10.3.8.1 Axial Lead and Pigtail Parts • • • • • • • • • • • • •.•• 43
15-10.3.8.2 Terminal or Wire Designations ••••••••••• : •• 43
15-10.3.8.3 Wiring Tie Point Designations •••••••••••••• 43
15-10.3.9 Device or Part Rating, Type, Range or Scale Indication. 43
15-10.3.10 Wire or Cable Size and Type. • • • • • • • • • • • • • • • •• 43
15-10.3.10.1 Identification......................... 43
15-10.3.10.2 Method of Identification on Diagram • • • • • • • • •• 43
15-10.3.10.3 Wire Color or Color Code Placement. • • • • • • • •• 44
15:10.3.11 Direct or Surface Wiring. • • • • • • • • • • • • • • • • • • •• 44
15-10.3.12 Critical Wiring. • • • • • • • • • • • • • • • • • • • • • • • • •• 44
15-10.3.13 Leads - Pigtail (PGT). • • • • • • • • • • • • • • • • • • • •• 44
15-10.3.14 Phasing Indication. • • • • • • • • • • • • • • • • • • • • • • •• 44
15-10.3.15 Polarity Indication •••••••••••••••••••••••• 44
15-10.3.16 Holes. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 44
15-10.3.17 Additional Cable Stitch Indication •••••••••••••• 45
15-10.3.18 Prewired Connections •••••••••••••••••••••• 45
15-10.3.19 Twisted Wire Designations • • • • • • • • • • • • • • • • • •• 45
15-10.3.20 Symbols • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •• 45
15-10.3.21 Drawing Notes • • • • • • • • • • • • • • • • • • • • • • • • • •• 45
15-10.4 Continuous-Line Type. • • • • • • • • • • • • • • • • • • • • • • • •• 45
15-10.4.1 Point-to-Point Diagrams. • • • • • • • • • • • • • • • • • . • •• 45
15-10.4.1.1 Application...................... • • • •• 46
15-10.4.2 Highway or Cable Diagrams ••••••••• • • • • • • • • •• 46
15-10.4.2.1 Feed Lines. • • • • • • • • • • • • • • • • • • • • • • • • •• 46
15-10.4.2.2 Wire Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
15-10.4.2.3 Highway or Cable Lines •••••••••••••••••• 46
15-10.4.2.4 Critical and Segregated Wiring •••••••••••••. 47
15-10.5 Interrupted Line Type •••••••••••••••.••••••.••• 47
15-10.5.1 Base-Line or Feed-Line Diagrams ••••••••••••••• 47
15-10.5.1.1 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
15-10.5.1.2 Component Device or Part Locations - Base-Line
Memod. • • • • • . • • • . . . • • . • • • • . • • • . • . . ..
47
15-10.5.1.3 Component Device or Part Locations - Feed-Line
Method. . . . • . . . • • . • • . . . . . • • . • . • • . • . ..
49
15-10.5.1.4 Location Numbers and Letters •••.••.••••••• 49
15-10.5.1.5 Additions............................ 49
15-10.5.1.6 Base-Line Representation. • • • • • • • • • • • • • • •• 49
15-10.5.1.7 Feed-Line Representation. • • • • • • • • • • • • • • •• 49
15-10.5.1.8 Wire Color Indication •••••••••••••••••••• 56
15-10.5.1.9 Wires - Pigtail. • • • • • • • • • • • • • • • • • • • • • •• 56
15-10.5.1.10 Letter Suffixes for Wire Identification. • • • • • • •• 56
15-10.6 Tabular Type •••••••••••••••••••••.•••••.•••• 59
15-10.6.1 Wiring Information Arrangement. • • • • • • • • • • • • • • •• 59
15-10.6.2 Tabulation Sequence. • • • • • • • • • • • • • • • • • • • • • •• 60
15-10.6.2.1 ListingMethods ••••••••••••••••••••••• 60
15-10.6.3 Placement of Lists. • • • • • • • • • • • • • • • • • • • • • • •• 62
ix
Page
15-10.6.4 Terminal Identification ••••••••••••••••
15-10.6.5 Pigtail Parts •••••••••••••••••••••••
15-10.6.5.1 Polarity or Orientation of Axial-Lead Parts
15-10.6.6 Supplementary Data.
15-12 Terminal Diagrams •••••••
15-12.1 Circuit Representation ••
15-12.2 Terminal Representation and Arrangement
15-12.3 Orientation Features •••••••••••
15-12.4 Terminal Arrangement Designations
15-12.5 Terminal Identification ••••••••••
15-12.5.1 Terminal Group Datum Lines •••
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Figures
Page
3-1
5-1
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
6-11
Line Conventions for Diagrams
Typical Single-Line Diagram (Electronics and Communications)
Portion of a Typical Single-Line Diagram •••••••••••••••••
Typical Generator Ratings •••••••••••••••••••••••••••
Typical Winding Symbols ••••••••••••••••••••••••••••
Typical Oriented Generator and Transformer Phasor Symbols •••••
Typical Transformer Neutral Ground Symbol ••••••••••••••••
Typical Marking of Feeder Circuit Load ••••••••••••••••••
Typical Protective Relay Connections •••••••••••••••••••
Typical Instrumen t and Meter Connections •••
~
Illustration Showing Circuit Breaker Mechanism Symbol ••••••
Typical Instrument Transformer Symbols and Markings ••••••
Typical Power Switchgear Single-Line Diagram with Complete
Device Designations ••
6-12 Typical Power Switchgear Single-Line Diagram with Abbreviated
Device Designations •••••••••••••••••••••••••••••••
6-13 Typical Industrial Control Single-Line Diagram ••••••••••••
7-1
Junctions and Crossovers •
7-2
Identification of Interrupted Lines ••
7-3
Typical Arrangement of Line Identifications and Destinations ••••
7-4
Typical Interrupted Lines Interconnected by Dash Lines •••••••
7-5
Typical Schematic Diagram showing Mechanical Linkages ••
8-1
Terminal Identification Example - Toggle Switch.
8-2
Terminal Identification Example - Rotary Switch
8-3A Terminal Identification and Orientation-Lever Switch (Key)
8-3B Relationship of Key top Front and Spring Terminal Quadrants
TyPical Lever Switch (Key) •
Terminal Identification Example - Adjustable Resistor ••••••••
8-4
Position-Function Relationships for Rotary Switches (Optional
8-5
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Methods) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •
Position-Function Relationships for Rotary Switches (Tabular
Method Only) . . . . . . . . • . . • . . . . . . . • . . . . . . . . . . . . . . . .
8-7
Terminal Identification - Electron Tube Pins ••••••••••••••
8-8
Single-Line Diagram Representation •••••••
8-9
Complete Diagram Representation •
8-10 Identification of Parts by Suffix Letters •
8-11 Typical Development of a Graphic Symbol Complex Rotary Switches
8-12 Identification of Portions of Items
8-13 Identification of Individual Terminals
8-14 Typical Table Indicating Omitted and Highest Numerical Reference
Designations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-15 Reference Designation, Type Designation and Function - Electron
Tubes and Semiconductors
Table 8-1 Multipliers
8-16 Methods of Numerical Value and Reference Designation Placement.
8-17 Typical Switching-Circuit Schematic Diagram (Use of Junction Dots
Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-18 Contact-Separation Method of Schematic Representation (Circuit
Same as Shown in Figure 8-17) ••
8-19 Typical Schematic Diagram (See 15-8oll for Other Forms).
8-20 Typical Schematic Diagram •
8-21 Typical ~1aintenance Type-Schematic Dia~ram
8-22 Typical Application of Circuit Return Symbols •••••••
8-23 Schematic Representation in Relation to Termination Method Used
8-24 Typical Microwave-Circuit Schematic Diagram •••••
Typical Locations for Device Ratings •••
9-1
Typical Multi-Ratio Current Transformer Rating •••
9-2
Typical Device Function Explanatory Note •
9-3
Typical Terminal and Wire Designations ••••••••••
9-4
Standard Identification of Bushing Current Transformers ••••••
9-5
Typical Schematic Diagram showing Terminal and Interconnection
9-6
De signations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
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Page
9-~
9-8
9-9
9-10
9-11
10-1
10-2
10-3
10-4
10-5
10-6
10-7
10-8
10-9
10-10
10- 1 1
10-12
10-13
10-14
10-15
10-16
10-17
10-18
10-19
10-20
10-21
10-22
10-23
10-24
10-25
12-1
12-2
12-3
12-4
Proper Location of Mechanism with Respect to Breaker Bushings ••
Example of Circuit Arrangement in Functional Sequence ••••••••
Typical Power Switchgear AC Schematic Diagram (Using BothTerminal and Wire Designations) •••••••••••••••••••••••
Typical Power Switchgear DC Schematic Diagram (Using Both
Terminal and Wire Designations) •••••••••••••••••••••••
Typical Industrial Control Schematic Diagram ••••••••••••••
Viewing Directions - Typical for Chassis-Type Equipment ••••••
Viewing Directions - Typical for Cabinet Type of Equipment ••••
Representation of Terminals Occurring in Planes not Parallel to thp
Moun ting Surface •••••••••••••••••••••••••••••••••
Representation of Terminals on Terminal Boards or Strips ••••••
Device or Part Rating, Type, Range, Scale Indication •••••••••
Methods of Showing Passage of Connecting Lines Through Holes ••
View of Typical Cable Section Showing Regular and Series of
Additional Stitches ••••••••••••••••••••••••••••••••
Graphic Symbols Commonly Used on Connection Diagrams ••••••
Typical Point-to-Point Connection Diagram ••••••••••••••••
Typical Point-to-Point Connection Diagram and Notes •••••••••
Methods of Indicating Feed Line Wire Data and Destinations on
Highway or Cable Connection Diagrams •••••••••••••••••••
Typical Highway or Cable Connection Diagram ••••••••••••••
Typical Highway or Cable Connection Diagram - Relay and Control
Panel (See Also Figure 10-14) ••••••••••••••••••••••••
Internal Connection Diagrams for Figure 10-13 ••••••••••••••
Typical Highway or Cable Connection Diagram - Breaker
Mechanism Housing •••••••••••••••••••••••••••••••
Typical Highway or Cable Connection Diagram ••••••••••••••
Explanation and Application of Base-Line Connection Diagram
Nomenclature and Method. Using a Portion of a Typical Diagram.
(Basically the Same for Feed-Line Method, see Figure 10-18) ••••
Typical Feed-Line Connection Diagram ••••••••••••••••••
Typical Base Line Connection Diagram (For Associated Schematic,
see Figure 8-17) . . . . . . . . • • . • . . • . . . . • . . . . . . . . . . . . .
Typical Base Line Connection Diagram ••••••••••••••••••
Comprehensive Method of Tabulating Wiring Conditions ••••••••
Diagram Showing Relative Location of Items in an Equipment ••••
Typical Connection - Diagram - with Tabulation for those
Connections Not Shown Diagrammatically •••••••••••••••••
Pigtail Component Entries in a Typical Tabular Listing •••••••
Comparison of Tabular and Pictorial Forms of Connection Diagram
for the Same Assembly •••••••••••••••••••••••••••••
Typical Electron Tube Basing or Terminal Diagrams ••••••••••
Typical Semiconductor Device or Terminal Diagrams •••••••••
Typical Relay Terminal Diagram •••••••••••••••••••••••
Typical Packaged Circuit Terminal Diagram •••••••••••••••
xii
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USA STANDARD
DRAFTING PRACTICES
Electrical and Electronics Diagrams
15-1 Scope
This standard contains definitions and general
information applicable to most of the commonly
used Electrical and Electronics Diagrams. It also
includes detailed recommendations on preferred
practices for use in the preparation of Electrical
and Electronics Diagrams. The recommended
practices covered by this standard are ground
rules designed to eliminate divergent Electrical
and Electronics Diagram drafting techniques.
The illustrations shown represent good drafting
practices. They are not intended as engineering
design guides.
15-2.2 Schematic or I: h-melliary l)iagram
A diagram which shows, by means of graphic
symbols, the electrical connections and function s
of a specific circuit arrangement. The Schematic
Diagram facilitates tracing the circuit and its
functions without regard to the actual physical
size, shape, or location of the component device
or parts. (See 15-8.10 for Schematics prepared for
maintenance purposes.)
15-2 Definitions
The following diagram definitions have been
adopted as standard.
15-2.3 CmlllectifJll or Wirillg l)iagram
A diagram which shows the connections of an
installation or its component devices or parts. It
may cover internal or external connections, or
both, and contains such detail as is needed to
make or trace connections that are involved. The
Connection Diagram usually shows general
physical arrangement of the component devices
or parts.
15-2.1 Sitlgle-Lille or One-Litle Diagram
A diagram which shows, by means of single
lines and graphic symbols, the course of an electric circuit or system of circuits and the component devices or pacts used therein.
15.2.4 IlIttirCfHlIJtiction Diagram
A form of Connection or Wiring Diagram which
shows only external connections between unit assemblies or equipment. The internal connections
of the unit assemblies or equipment are usually
omitted.
1
USA STANDARD DRAFTING PRACfICES
~.'")
USA Standards'
15-2.5 Terminal Diagram
A diagram relating the funcuor ally ~epicted
internal circuit of an item or device to Its terminal physical configuration, and locating the
terminals with respect to the outline or orientation markings of the item.
C6.1-1956- Terminal Marking for Electrical
Apparatus
C37 .2-1962 - Manual and Automatic Station
Control, Supervisory, and Associated Telemetering Equipments
C37 .11-1957 - (RI962) Requirements for Power
Circuit Breaker Control
C37 .20-1965 - Switchgear Assemblies Including
Metal Enclosed Bus
C42 (various sections) - Definition of Electrical T enns
C83.1-1956-Color Coding for Numerical Values
of Components for Electronic Equipment
Y14 - Drafting Manual
YI4.1-1957 - Section I-Size and Format
YI4.2-1957 - Section 2 - Line Conventions
Sectioning, and Lettering
Y32.2-1962 - Graphic Symbols for Electrical
and Electronic Diagrams
Y32.2a-1964 - Supplement No.1 to Y32.2-1962
Y32.14-1962 - Graphic Symbols for Logic Diagrams
Y32.16-1965 - Electrical and Electronic Reference Designations
Z32.13-1950 - Abbreviations for Use on Drawings
15-2.6 Other Terms
In various portions of the electrical and electronics field, long standing usage of a few terms
has varied widely.
A DEVICE in the electric power field is often
a PART in the electronics field; generally these
are elemental circuit items such as fuses, meters,
relays, resistors, or switches. In this sense,
PAR T has a specific meaning different from the
usual dictionary definition implying a portion.
COMPONENT is ambiguous, for it
(a) has long established usage meaning a
PART in the electronic sense,
(b) has been defined as a subassembly (one or
more circuits made up of devices or parts),
and
(c) also means a subsystem or a system (for
example, a power supply).
EQUIPMENT in this standard implies an assembly of devices designed to perform one or
more specific independent or operational functions; it includes units, sets, and systems.
ITEM is used in the usual dictionary sense.
COMPONENT DEVICE in this standard is applied to parts, devices, apparatus, assemblies,
or units.
IEEE Standards 2
260 Symbols for Units
NEMA Standards 3
ICl-1965- Industrial Control
SG4-1963 - High Voltage Power Circuit Breakers
SG5-1959 - Power Switchgear Assemblies
The text hereinafter may reference these other
standards in brief fonn; for example:
USA Standard Y32.2 orNEMA Standard ICI.
15-3 General In formation
The following sub-paragraphs cover basic material which is applicable to all diagrams.
15-3.1 Other Reference Standards
The following other standards are referenced
in various sub-paragraphs of this ~tandard. When
the issues listed below are superseded by a revision approved by the issuer, the revision shall
apply.
When this standard is used as a U.S. MiIital)'
requirement, for those topics covered by separate
USA and Military Standards, the equivalent approved U.S. Military Standard shall be used ip
lieu of the specified USA Standard. 4
1 USA Standards Institute, New York, New York
21nstitule of Electrical and Electronics Engineers, Inc., New York, New York
3National Electrical ManufActurers Association, Inc., New York, New York
4As of the date of this Standard:
In lieu of
USA
Standard
Use
Y14, Y14.1
Y14.2
MIL-5TD-IOO
Y32.2
MIL-STD-lS-l
Y32.14
MIL-5TD-806 or
MIL-STD-OOB06 (NAVY)
as applicable
Z32.13
MIL-5:rD-12
2
ELECTRICAL AND ELECTRONICS DIAGRAMS
(c) Upper-case letters, underlined.
15-3.2 Diagram Titles
When a diagram takes the form of one of the
types defined in 15-2, the name of the type of
diagram should be included in the title. For example: SINGLE-LINE DIAGRAM (not DIAGRAM,
LINE, SINGLE).
The meaning of the asterisk or underline shall
be explained in a drawing note.
LINE
APPLI CA TI ON
15-3.3 Combined Forms 0/ Diagrams
Many Schematic Diagrams become more useful
when they include pertinent wiring information;
many Interconnection Diagrams gain in utility
when part or all of the connections within individual units are shown. Prov ided approved
standards are observed, combined forms of diagrams may be used when the net result is helpful
to the user. When this principle is applied, however, the diagram title should still conform to the
requirements of 15-3.2, the title being selected
on the basis of the major purpose of the diagram.
FOR GENERAL USE
MECHANICAL CONNECTION:
SHIELDING & FUTURE
CIRCUI t S LINE
BRACKET-CONNECTING
DASH LINE
USE OF
THESE
LINE
THICKNESSES
OPTIONAL
15-3.4 Drawing Size and Format
Drawing sizes and formats used with diagrams
shall conform with USA Standards Y14.1. In
general, the smallest size standard format compatible with the nature of the diagram should be
selected. When interrelated diagrams are sectionalized and prepared on different drawings, or
as multiple sheet drawings, suitable cross references should be provided. Separate sheets of
multiple sheet drawings should be the same size.
LINE
THICKNESS
MEDIUM
MEDIUM
--MEDIUM
---
BRACKETS. LEADER
LINES. ETC.
THIN
MECHANICAL-GROUPING
BOUNDARY LINE
THIN
FOR EMPHASIS
THICK
FIGURE 3-1
LINE CONVENTIONS FOR DIAGRAMS
15-3.6 Graphic Symbols
Graphic symbols used for diagrams shall conform with USA Standard Graphic Symbols for
Electrical and Electronics Diagrams, Y32.2, or
other national-level standards if the symbol is
not covered in the USA Standard. If no suitable symbol exists, any special symbol used
shall be explained by a note on the diagram.
Symbols or parts of symbols (except letters and
numbers) which lend themselves to being rotated
or reversed may be so oriented for simplification
of circuit layout. The terminal symbol (0) may be
added as required to any of the basic symbols.
Graphic symbols may be drawn to any proportional size that suits a particular diagram, provided the selection of size takes into account
the anticipated reduction or enlargement. For
most diagrams intended for manufacturing purposes, or for ultimate use in a reduced form (2.5
to 1 max.), it is recommended that symbols be
drawn approximately 1.5 times the size of those
shown in the USA Standard Y32.2. The use
of a symbol in the illustrations of this standard
does not preclude the use of alternatives shown
in Y32.2.
15-3.5 Line Conventions and Lettering
The selection of line thickness as well as
letter size should take into account size reduction or enlargement, when it is felt that legibility
will be affected. A line of medium thickness is
recommended for general use on diagrams. A thin
line may be used for brackets, leader lines, etc.
When emphasi s of special features such as main
or transmission paths is essential, a line thickness sufficient to provide the desired contrast
may be used. Line thickness and lettering used
with diagrams shall, in general, conform with
USA Standard Y14.2 and local requirements
to facilitate microfilming. Line conventions, relative thickness and suggested applications for use
on Electrical and Electronics Diagrams are
shown in Figure 3-1.
15-3.5.1 Lower Case Letters
When necessary (to avoid ambiguity) to indicate or distinguish between upper and lower
case letters that appear on an item or in a
national standard, any of the following alternatives shall be used:
15-3.6.1 Representation of Electrical Contacts
Switch symbols shall be shown in the position
of no applied operating force. For switches which
may be in anyone of two or more positions with
no operating force applied or switches actuated
(a) Lower case letters (enlarged, when necessary,
for proper reproduction).
(b) Upper case letters followed by asterisks (for
example, A* signifies a, A*BC* signifies aBc,
etc.).
3
USA STANDARD DRAFTING PRACTICES
by some mechanical or electrical means, a drawing note shall identify the functional phase shown
in the diagram. Relay contacts shall be shown
in the de-energized or nonoperated condition.
planation of the revision, this is desirable. When
detailed explanation is not practicable, a revision note covering the general nature of the
revision should be included. A reference to a
change order document may be shown in lieu of
an explanation.
15-3.7 Abbreviations
Abbreviations used on diagrams should conform with USA Standard Abbreviations for
Use on Drawings, Z32.13, or other national-level
standards if the abbreviation is not covered in
the USA Standard. If no suitable abbreviation exists, a special abbreviation may be used,
but must be explained by a note on the diagram.
15-3.11 Wire Color Information
Wire colors may be indicated by giving either
color designations or numerical color codes. Indication of color designations is preferable when
many colors and color combinations such as
BK-W are to be shown. When numerical color
codes are used, care should be taken to avoid
confusion with other numerical references. Recommended single and two letter color designations
for use specifically on diagrams and corresponding color identifications by numerical code are
as follows:
15-3.8 Layout of Diagrams
The layout of diagrams shall be such that the
main features are prominently shown. The parts
of the diagram should be spaced to provide an
even balance between blank spaces and lines.
Sufficient blank area should be provided in the
vicinity of symbols to avoid crowding of notes
or reference information. Large spaces, however,
should be avoided, except that space provision
may be made for anticipated future circuits if
deemed necessary.
Wire
Color
Designation
(USAS Z32.13)
Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
(Purple)
Gray (Slate)
White
15-3.8.1 Grouping of Parts
When a circuit contains parts which need
be shown grouped, the grouping may be indicated
by means of a boundary (phantom) line enclosure.
The phantom line enclosure may be omitted if
sufficient space is provided between parts. Typical groupings are unit assemblies, subassemblies, printed circuits, hermetically sealed units,
contactor parts, relays, etc. The dash line used
to indicate shielding also implies that the parts
enclosed by the dash line are grouped.
BK
BR
R
0
Y
G
BL
V
(PR)"
GY (S)
W
Numerical
Code
(USAS C83.1)
0
1
2
3
4
5
6
7
8
9
15-4 Single-Line Diagrams, General
The Single-Line Diagram conveys basic information about the operation of a circuit or a
system of circuits, but omits much of the detailed information usually shown on Schematic
or Connection Diagrams. This form of presentation lends itself to simplified diagrams of complex circuits and to diagrammatic representation of communication or power systems, in
which a single line represents a multi conductor
comml1nication or power circuit.
15-3.9 Drawing Number Reference Location
When diagrams are reproduced for instruction
book or similar purposes, it may be desirable to
retain the original drawing number within the
reproduced area. This drawing number(if included)
should be shown close to the lower right edge of
the diagram, in a lettering size comparable to
that used for notes and other detailed reference
material.
15-}.10 Diagram Revisions
Provisi09 shall be made on all types of Electrical and Electronics Diagrams for recording
revisions. The record of changes made in each
revision shall be identified by either a number,
letter or character and the date of the revision.
When it is possible to make a brief detailed ex-
15-5 Single-Line Diagrams (Electronics and
Communications)
Figure 5-1 is a typical Single-Line Diagram
applied to a complex audio system. In gen eral,
the practices established in 15-7 apply equally
well to the preparation of Single-Line Diagrams.
I
4
~
'.)...
ELECTRICAL AND ELECTRONICS DIAGRAMS
POWER
AMPLIFIERS
REFERENCE
TEST
TERMINALS
FOATEST
LOUDSPEAI<EAS
H
TALKBACK
CHANNEL
MONITOR
LOUOSPEAKER
TAloKBACK
MICROf>HONe
FIGURE 5-1 - TYPICAL SINGLE-LINE DIAGRAM (ELECTRONICS AND
.
COMMUNICATIONS
15-6 Single-Line Diagrams (Power Switchgear
and Industrial Control)
The following sub-paragraphs contain detailed
information specifically applicable to Power
Switchgear and Industrial Control Single-Line
Diagrams. This material is to be used as a supplement to the general standards of 15-4.
600 A
1500 MVA
LINE
15-6.1 General In/ormatio,z
The Single-Line or One~Line Diagram is a key
diagram showing the overall relationship between
circuits and their component devices or parts.
Only a single line is used to show an AC or DC
sy stem as illustrated in Figure 6-1. Thick connecting lines indicate primary circuits. Medium
connecting lines indicate the connections to the
current and potential sources. Small circles portray relays, meters and instruments, and small
rectangles depict resistors, transfer and selector
switches. Power circuit devices and relays are
identified by device function designations
(USA Standard C37.2); meters, instruments
and switches by abbreviations and letter combinations (refer to 15-3.6 and 15-3.7).
~~--------------------~
W
FIGURE 6-1 - PORTION OF A TYPICAL
SINGLE-LINE DIAGRAM
15-6.2.1 Ratings
Ratings which are essential to an overall
understanding of the system shall be included.
Detailed ratings should be stated on the Connection Diagram. Generator ratings, for example,
include: kilowatt capacity, power factor, voltage,
number of phase windings, cycles and revolutions per minute as shown in Figure 6-2.
15-6.2 Contents
A Single-Line Diagram shows connections of
major equipment, protective relays, meters, and
instruments. Consideration shall be given to
inclusion of the following information:
NOTE: Industrial Control Single-Line Diagrams
may omit equipment ratings when they are used
as standard drawings applying to more than one
rating.
5
USA STANDARD DRAFTING PRACTICES
6) ~
15-6.2.4 Feeder Circuits
When available the rating and type of load
should be stated for each feeder circuit as illustrated in Figure 6-6.
GEN 30000 KW
0.85 PF 13.8 KV
3 PH 60 CIS .3600RPM
FIGURE 6-2 - TYPICAL GENERATOR RATINGS
BUS
15-6.2.2 Winding Connection Symbols
Winding connection symbols should be shown
for all power equipment. Typical wye connections
and wye-delta connections of a transformer are
indicated in Figure 6-3.
'I~
3-300/5
T
FEEDER NO.1 - 480V
1500 KVA LOAD CENTER
FIGURE 6-6 - TYPICAL MARKING OF FEEDER
CIRCUIT LOAD
FIGURE 6·3 - TYPICAL WINDING SYMBOLS
When it is desirable to use the winding connection symbols as phasors this should be so
noted and the phase rotation and sequence included. Note that the delta-wye symbols of the
transformer and the "Y" symbol of the generator in Figure 6-4 have been properly oriented
for the system relationships.
15-6.2.5 Protective Relaying
Show the operating source, current or potential, or both, by connecting lines or by notes
for each relay which functions as a protective
device. See Figures 6-7, 6-11, 6-12 and 6-13.
35000 KVA
115-13.2 KV
3 PH 60 CIS
2-14400-120
GEN 30000 KW
0.85 PF 13.8 KV
3 PH 60 CIS 3600 RPM
FIGURE 6-4 - TYPICAL ORIENTED GENERATOR
AND TRANSFORMER PHASOR SYMBOLS
~------------------------~40
15-6.2.3 Neutral and Ground Connections
The neutral and ground connections should
be shown for all power circuits as indicated in
Figure 6-5.
'I~
T
FIGURE 6-7 - TYPICAL PROTECTIVE RELAY
CONN ECTIONS
35000KVA
115-13.2 KV
3PH 60C/5
15-6.2.6 Instruments, Meters and Associated
Switches
Show the operating source, current or po·
tential, or both, by connecting lines or by notes
for each device. See Figures 6-8, 6-11 and 6-12.
FIGUR E 6-5 - TYPICAL TRANSFORMER NEUTRAL
GROUND SYMBOL
6
EL ECTRICAL AND ELECTRONICS DIAGRAMS
1-14400-120
PH-I
~t3-600/5
CONN
3-200/5
200/5
FIGURE 6-8 - TYPICAL INSTRUMENT AND
METER CONNECTIONS
(A)
15-6.2.7 Power Circuit Breaker Mechanism
Indication of the mechanism end of the power
circuit breaker may be shown to permit proper
orientation of bushing current transformers. See
Figure 6-9 (shown below), and 15-9.1.6.
( B)
(C)
FIGURE 6-10 - TYPICAL INSTRUMENT
TRANSFORMER
SYMBOLS AND MARKINGS
15-6.3 General Layout
The arrangement of the diagram should be made
to give the utmost in clarity. The following requirements shall be observed in the preparation
of the diagram:
15-6.3.1 Graphic Symbols
Symbols for Single-Line Diagrams are intended to indicate the operating functions. These
symbols are shorthand graphic representations
and are not necessarily intended to represent the
physical likeness of the device nor contain complete electrical connections. Graphic symbols
shall be applied as described in 15-3.6.
15-6.3.2 Abbreviations
Abbreviations shall be applied as described
in 15-3.7.
FIGUR E 6-9 - ILLUSTRATION SHOWING CIRCUIT
BREAKER MECHANISM SYMBOL
15-6.3.3 Device Designations
Device designations shall be applied as
described in 15-9.2.3.
15-6.2.8 Ratios of Instrument Transformers
Current transformers should show the number
of transformers and the ampere ratio; Figure
6-10(A). For current transformers with multiple
ratios, the connected ratio should also be indicated; Figure 6-10(B). If only one or two transformers are present in a three-phase system, the
phase location of these transformers should also
be shown; Figure 6-10(C).
15-6.3.4 Course of Main Circuits
Course of main circuits should be shown in
the most direct path and logical sequence. Information in 15-7.1 also applies to the SingleLine Diagram.
7
USA STANDARD DRAFTING PRAcrICES
the drawing and successively lower voltages
towards the bottom or right of the drawing.
15-6.3.5 Horizontal and Vertical Lines
Lines between symbols should be horizontal
or vertical with a minimum of line crossings, and
with spacing to avoid crowding. Information in
15-7.2 also applies to the Single-Line Diagram.
15-6.4 Typical Single-Line Diagrams
Typical Single-Line Diagrams that illustrate
good drafting practice are shown in Figure 6-11,
6-12 and 6-13. The choice between Figure 6-11
and Figure 6-12 is optional.
15-6.3.6 Voltage Arrangement
The arrangement of the diagram should preferably show the higher volta~es at top or left of
II~ KV BUS
:hI: 3-II~OOO-1I5
600A
1500MVA
BUS
- -...-----·DFF
87T
1-664.00-115
II......
~ fll
E-t-+ PHI
W
LINE 1
2-14400-120
SYN
SYN
87G
GEN 30000KW
0.8~
PF 13.8 KV
3PH 60 CIS 3600 RPM
EXC
125KW
250V
t:-.=;--Q
~
,,00 G
RES
't' GEN NEUTRAL
FIGURE 6-11 - TYPICAL POWER SWITCHGEAR SINGLE-LINE DIAGRAM WITH COMPLETE DEVICE DESIGNATIONS
8
ELECTRICAL AND ELECTRONICS DIAGRAMS
IISKV BUS
11;;t 5-115000-115
lv.s.w.V.A.WH
3-600/5
CONN
3-600/5
CONN
20015
400/5
600A
I500MVA
W, VAR,WH,A
3-600/5
CONN
20015
t"C"
3-600/5
CONN
600/5
1"0"
t
"b"
~ cb
-66400-115PHI
f-f-'II
II.......
2-14400-120
~;;'W'WH'V'A
lL
LINEI
S
E--QREG
2 -14400-120
_t_______
I
GEN 30000 KW
0.85 PF 13.8 KV
3PH 60CIS 3600
RP~
¥
T
0
EXC
~5KW250V~
RES
-
-0
REG
o
®
INSTRUMENTS
RELAY
"0" GEN OIFF
"b" TRANS OIFF
f"O"
.. c ..
BUS OIFF
""tl
GEN NEUTRAL
"d"
OIR GRO
FIGURE 6-12 - TYPICAL POWER SWITCHGEAR SINGLE-LINE DIAGRAM WITH ABBREVIATED DEVICE DESIGNATIONS
9
USA STANDARD DRAFTING PRACTICES
5 KV
1
400A
225A
5KV-220V
I
5KV-220V
LCONTROL
~CIRCUIT
LCONTROL
~CIRCUIT
2-200/5
2-600/5
M
A
1000 HP
FIGURE 6-13 - TYPICAL INDUSTRIAL CONTROL SINGLE-LINE DIAGRAM
10
ELECTRICAL AND ELECTRONICS DIAGRAMS
15-7 Schematic Diagrams, General
The following subparagr~phs contain general
information for use in the preparation of Schematic Diagrams.
-f+
++
+ +
15-7.1 Layout
The Schematic Diagram shall use a layout
which follows the circuit, signal, or transmission
path either from input to output, source to load,
or in the order of functional sequence. Long interconnecting lines between parts of the circuit
should be avoided. Draw similar basic circuits
in a similar form (this does not prevent the use
of simplified drafting practice to depict repeated circuits).
SINGLE JUNCTION
II NO DOT· METHOD
CROSSOVER
(NO JUNCTION)
(A)
SINGLE JUNCTION
"DOT- METHOD
15-7.2 Connecting Lines
Connecting lines should be drawn with as few
bends and crossovers as possible. Except for
such circuits as "multi-vibrators" and "bridges,"
connecting lines and the symbols joined by them
should be drawn horizontally and vertically.
CROSSOVER
(NO JUNCTION)
(B)
15-7.2.1 Spacing
Spacing between parallel lines after reduction to ultimate use size (see 15-3.6) shall be
a minimum of 0.06 inch. The longer parallel lines
shall be arranged in groups, preferably three to a
group, with approximately double spacing between
groups; see Figure 7-3. In determining the grouping, functional relation of the lines should 'also
be considered.
MULTIPLE JUNCTION
NO DOT
CONNECTION
CROSSOVER
(NO JUNCTION)
(C)
"
15-7.2.2 Junctions and Crossovers
All junctions of connecting lines should be
shown as single junctions, as shown in Figure
7-1(A), the preferred method, or Figure 7-1 (B).
Figure 8-17 illustrates the practice of Figure
7-1(B). When layout considerations prevent the
exclusive use of the single junction methods of
Figure 7-1(A) or 7-1(B), multiple junctions may
be shown as in Figure 7-1(C). Figure 7-1(D) illustrates the use of both the nno-doe' single
junction and "dot" multiple junction methods in
an array of lines where spacing precludes the
exclusive use of the ctno-dot" single junction
method of Figure 7-1(A)
SINGLE "NO DOT- AND MULTIPLE -DOTJUNCTION APPLICATION
(D)
FIGURE 7·1 - JUNCTIONS AND CROSSOVERS
15-7.3.1 Interrupted Single Lines
For single interrupted lines, the line identification may also serve to indicate destination
as shown in Figure 7-2 for the power and filament
circuit paths. In general, identification practice
for single interrupted lines shall be the sam e as
for grouped and bracketed lines described in
15-7.3.2.
15-7.3 Interrupted Paths
Connecting lines, whether single or in groups,
may be interrupted at convenient points and identified, with the destination indicated. Letters,
numbers, abbreviations, or other identifiers for
interrupted lines shall be located as close as
possible to the point of interruption.
11
USA STANDARD DRAFTING PRACTICES
+300V
+300V DC
REGULATED
(
• +300V
ADV
-ISOV DC
REGULATED
(
• -ISOV
MSG
6.3V
eoCy
[<
FRAME
(
CIRCUITGRO
J
TRR
TO
TIMING
CIRCUITS
TO
TIMING
CIRCUITS
X
y
(
t
~
TO
CONNECTOR
CIRCUIT
/A C
-ISOV
CONNECTOR INPUT
CIRCUIT ARRANGEMENT
I
FIGURE 7-2 - IDENTIFICATION OF INTERRUPTED
LINES
i
E
0
\
F
II
-----B-~J
-----E
----0
CONNECTOR
TO
CIRCUIT
----F
FIGURE 7-3 - TYPICAL ARRANGEMENT OF LINE
IDENTIFICATIONS AND DESTINATIONS
15-7.3.2 Intermpted Grouped Lines
When interrupted lines are grouped and
bracketed, and depending on whether the lines
are horizontal or vertical, line .identifications
shall be indicated as shown in Figure 7-3.
Bracket destinations or connections may be
indicated either by means of notations outside
the brackets as shown in Figure 7-3, or by means
of a dash line as shown in Figure 7-4. When the
dash line is used to connect brackets, it shall
be drawn so that it wi II not be mistaken for a
continuation of one of the bracketed lines. The
dash line shall originate in one bracket and
terminate in no more than two brackets.
15-7.4 Afecha'lical Linkages
When mechanical functions are closely related
to certain electrical functions, it may be desirable to link the mechanical components with
graphic symbols of the Schematic Diagram. A
typical example of how this may be done is
shown in Figure 7-5.
~T:}
_ _ _ _~AN_S~
__ -{~:NS
_T~A
_ _ __
FIGURE 7-4 - TYPICAL INTERRUPTED LINES
INTERCONN ECTED BY DASH LIN ES
FIGURE 7-5 - TYPICAL SCHEMATIC DIAGRAM SHOWING MECHANICAL LINKAGES
12
ELECTRICAL AND ELECTRONICS DIAGRAMS
15-S Schematic Diagrams (Electronics and Communication)
The following subparagraphs contain detailed
information which is specifically applicable to
Schematic Diagrams of the type used with electronic and communication equipment. This material is to be used as a supplement to the general standards of 15-7.
T7, and T8 of Figure 8-19 for examples of terminal markings.
15-8.4.1 Identification of Terminals (General)
Terminal identifications shall be added to
graphic symbols to indicate actual physical markings which appear on or near part terminations.
When the terminals of parts (such as relays,
switches, or transformers) are not shown or
marked on the part, number or letter identifications should be arbitrarily assigned. This practice will facilitate use of the circuit information
for Connection Diagram preparation and circuit
testing. When terminal identifications are arbitrarily assigned, the Schematic Diagram should
include an explanatory note (see Figure 8-17,
note 4) and a simplified terminal orientation diagram which relates assigned symbol terminal
nomenclature to functional markings on the equipment and physical features of the part. For examples of terminal numbering and simplified terminal orientation diagrams for the drawing note,
see Figures 8-1,8-2,8-3,8-17, and 8-19.
When terminals or leads of multilead parts
are identified on the part by a wire color code,
letter, number or geomeuic symbol, this identification shall be shown on or near the connecting
line adjacent to the symbol. For an example, see
transformer TIO (color of leads) and capacitor
C40 (geometric symbol) of Figure 8-19.
15-S.1 Layout
In general, Schematic Diagrams should be arranged so that they can be read functionally from
left to right. Complex diagrams should generally
be arranged to read from upper left to lower right,
and may be laid out in two or more layers. Each
layer should be read from left to right.
The overall result shall be a circuit layout
which follows the signal or transmission path
from input to output, or in the order of functional
sequence. Where practical, terminations for external connections should be located at the outer
edges of the circuit layout.
15-S.2 Drawing Zones
Zones (coordinates) should be shown on a complex Schematic Diagram to aid in the location of
specific items; see Figure 8-19. If a Schematic
Diagram is prepared mainly for maintenance purposes and is likely to be reproduced in a technical manual or its equivalent, it is preferred
that the coordinate system begin in the upper
left. This preference is based on beginning the
reference designation suffix number assignment
from the same area on the Schematic Diagram
(see 15-8.6). However, when the diagram is prepared on a zoned drawing format, the format
zones may be used.
10
40
:::J
06
SYMBOL ON
SCHEMATIC
DIAGRAM
15-8.3 Circuit Return and Connection Symbols
For the application of circuit return symbols
[2, --., ----C>*,seeFigure
8-22. The ..,.symbol should be used when there
is a specific potential difference with respect to
a potential reference level, and the
*symbol should be used when the common connections
are at an unspecified potential level. Asterisks
shall be replaced in accordance with USA Standard Y32.2.
-III, --
--t>
o
3 0
03
6
.......
VIEWED
2 O{~O 5 FROM
REAR
10
o
4
TERMINAL
ORIENTATION
DIAGRAM
ASSOCIATED
WITH NOTE
FIGURE 8-1 - TERMINAL IDENTIFICATION
EXAMPLE - TOGGLE SWITCH
15-S.4 Terminals
Terminal circles should be omitted unless required for clarification. See switch SI in Figure
8-19 for a typical application of the standard
terminal symbol to a complex switch. For preferred terminal representation of spring contacts
for relays, jacks and key switches, see Figure
8-17, graphic symbols J 1, SI, Kl. When terminal
symbols are omitted from the terminations of a
part, or an enclosed or shielded group of parts,
terminal markings should be placed immediately
outside the enclosure. See parts T2, T3, T4, T5,
SYMBOL ON
SCHEMATIC DIAGRAM
TERMINAL
ORIENTATION
DIAGRAM ASSOCIATED
WITH NOTE
FIGURE 8-2 - TERMINAL IDENTIFICATION
EXAMPLE - ROTARY SWITCH
13
USA STANDARD DRAFTING PRACTICES
s hown in F igure 8~4(A). If device terminal s are
not marked, number s may al so be used with the
res is tor symbol, wherein number 2 is ass igned
to the adjusta ble contact as s hown in Figure
8 ~ 4( B ) . Additional fixed taps may be numbered
s equentially , 4,5, etc., a s shown in Figure 8 ~ 4(C).
51
(014~
'o--z-r;
~SRI
' O-----V
aFF
I~
,
t
~4
o
~'
1
0
0
0
0
0
0
~2
0
0
0
0
c
~
~
OPR
"
tel
POS z t~ Is)
T
L___
51
,
(A)
0
0
0
0
0
0
,
1, A
,,
aPR
pos 2
OFF
,,
, B
aPR
pos
I
'"0",----1
cw
3
3
2
OPERATING END
T ERMINAL END
SYMBOl ON
SCHEMAT IC DIAGRAM
ew
cw
OF KEY
5
2
4
ORIENTATION DIAGRAM
ASSOC IAT ED WITH NOTE
FIGURE 8-3A - TERMINAL IDENT I F I CATION AND
ORIENTAT ION TYPICAL LEVER SWITCH (K EY )
(8)
(A)
(e)
FIGURE 8-4 - TERMINAL IDENTIFICATION
EXAMPLE - ADJUSTABLE RESISTOR
-.............-MOVEMENT OF
r---. --........
LEVE R
1 5 ~8 .4 .1.2 Switch Terminals and Circuit
FnnctioTl s
The relation o f swi tch position to circuIt
function sha ll be s hown on Sc hematic Diagram s.
For simp le toggle s witches, it may be sufficien t
to identify pos icion with notations s uch as ONOFF. For more complex switches, position~[o­
function relations may be s hown either near th e
s witch symbol or a c a more conveni ent loca ti on
on the d rawi ng . Figure 8- 5 shows how either form
o f repr esenta tion may be used fo r a multi po sicion rotary s witch.
When rotary s witches perfo rm involved
function s such as thos e ill usttated in Figure 8-6,
the tabular form o f presentin g supplementar y info rm ation is preferred. In t abular listin gs, dashes
link th e terminals tha t a re connected. Fo r examp le, in posit ion 2 of Fig ure 8 -6, termin als I and
3 are co nnec ted, as a re terminals 5 and 7 , and
9 an d 11. For an additional example of thi s
method, see Not e 4 o f Fig ure 8-19 ·
KEY l OP
TERM!NAL
QUAORANT
REFERENCE
LETTERS
- ",---11- -1-- -
CODE
MARKING
(FRO NT
j
OUA DR ANT TERMINAL
NUMSERING SEOUENCE
OUT WARD FROM _ _ _ 2
CENTER OF KEY
Q
or
1\£ '1')
CE N1"E R
OF KEY
I·
/'
FIGURE 8-3B - RELAT I ONSHIP OF KEYTOP
FRONT AND SPRING TE RMINA L QUADRANTS
TYPICAL LE V ER SWITCH ( KEY )
O~6-c
+=
4~
5a
~V
~U~N~R~'=G___
51
VOLTAGE
TEST
15-8.4 .1.1 Adjus ta ble R es i stor Terminal
Identification
When rotary type adjust able resi s tors are
s hown on S chematic Diagrams, it is often des ir able to indicate direction o f rotati on. For
indicating direction o f rotati on, it i s cu sto mary
to refer tb the rotary motion as clo ckwi se or
counterclockwise when rotati on i s viewed from
th e knob or act uato r e nd of the control. Th e
preferred method of termina l identification is to
des ign ate with the lett ers "CW" th e termi n al adjacent to th e movable coneact when it i s in an
extreme clockwise posic ion. Thi s meth od is
a
S +300V UNREG
4 +J50V REG
) ;:"3,_F-,+.::10,,,-,
0 V_ R:':':O:G::..._
FUNCTIONS SHOWN
AT SYMBOL
FUNCTIONS SHOWN
IN T ABULAR FORM
FIGURE 8-5 - POSITION-FUNCT ION
RELATIONSHIPS FOR ROTARY
SWITCHES (OPTIONA L METHODS)
14
ELECTRICAL AND ELECTRONICS DIAGRAMS
51
REAR
.; 1
12
"~
;o_~r~':3
8~,
7
51 (REAR)
POS
'04
FUNCTION
2)
TERM.
I
OFF(5HOWN)
2
3
STANDBY
1-2,5-6.9-10
1-3,5-7,9-11
OPERATE
1-4.5-8.9-12
3)
5
15-8.4.1.3 Electron Tube Pin Identification
Tube pin numbers shall be shown outside
the tube envelope and immediately adjacent to
the connecting line, as shown in Figure 8-7.
6
FIGURE 8-7 - TERMINAL IDENTI FICATION ELECTRON TUB E PINS
15-8.4.1.4 Connector
Coaxial
Contact
Identification
In showing and identifying contacts of
coaxial connectors, the Single-Line Diagram
representation of Figure 8-8 is preferred. The
complete diagram representation of Figure 8-9
may be used when it is essential to show shield
continuity.
2
)>--+-----
3
OR
I
2
,I
3
I
15.8.4.1.5 Integral Circuit Package, Circuit Pack or Subassembly Terminations
These terminations usually fall into one
of the three types shown on the left side of
Figure 8-23. The recommended circuit schematic
representation for each of the termination methods
is shown adjacent, to the right, of the physical
arrangements. While use of the mechanicalgrouping boun~ary line is shown to be optional
for arrangement 8-23(B), its use ,in this application is nevertheless recommended whenever
possible.
15-8.4.1.6 Circuit Pack Representation in
Overall and Other Schematic Diagrams
Circuit packs shown in overall and other
Schematic Diagrams may be represented in one
of the following ways:
(a) Pack circuitry may be repeated in detail
and shown enclosed with a mechanical-grouping
boundary line in a manner similar to the representation of ARI in Figure 8-22;
(b) Pack circuitry may be represented with specific graphic symbols. This method is recommended in place of (a) when pack circuitry
readily lends itself to symbolic representation,
and the use of such graphic symbols is compatible with the type of Schematic Diagram to be
prepared. An example of symbol application is
shown at the right in Figure 8-23. For information
on symbols that may be used for this purpose, see
USA Standard Y32.2 and Y32.14.
15-8.5 Division 0/ Parts
To clarify the circuit layout, portions of multielement parts may be separated, with portions of
the graphic symbol shown at different locations
on the Schematic Diagram.
FUNCTIONS SHOWN
IN TABULAR FORM
FIGUR E 8-6 - POSITION-FUNCTION
RELATIONSHIPS FOR ROTARY
SWITCHES (TABULAR METHOD ONLY)
)>--+----+--e~
Q
FIGURE 8-9 - COMPLETE DIAGRAM
REPRESENTATION
6
(SWITCH VIEWED
FROM FRONT)
SYMBOL ON
SCHEMATIC DIAGRAM
I
I
15-8.5.1 Identification of Parts by Suffix
Letter
Subdivisions of parts may be identified by
adding a suffix letter to the reference designation of the part. For example, CIA, CIB might
identify electrically separate sections of a dual
capacitor designated Cl. Suffix letters may also
be used to identify subdivisions of a complete
part when the individual parts are shown enclosed or are associated as in a compact unit.
See crystal unit of Figure 8-10 for an example of
this method.
OR
»)--10----FIGURE 8-8 - SINGLE-LINE DIAGRAM
REPRESENTATION
15
USA STANDARD DRAFTING PRACTICES
: AD,
-t{
: 0
·
L..
YI
r--
----,
PART OF
JI
B~
G)-1--
11-10~
~
B
c
15-8.5.4 Identification of Individual Terminals of Parts
When the separation of the pordons of connectors or terminal boards on the same drawing
becomes extensive, the separated portions may
be identified as individual terminals as shown
in Figure 8-13. If individual terminals from different portions (such as connectors) are intermixed, mechanical-connecting lines shall be
omitted.
>
TYPICAL SWITCH SECTION
FRONT
AID IN ORIENTATION)).
o
o
0
~...c>J
o
4
0
o
@t
o
o
J2-C
~
SIA
REAR
MAY BE ADDED AS At-I
(8)
15-8.5.3 Identification of Portions of Items
When portions of connectors, terminal boards
or rotary switch sections are functionally separated on the diagram:
(a) the words C C P ART OF" may precede the reference designation of the entire portion as shown
in Figure 8-12(A) and in Figure 8-19, switch
section SIA REAR, or
(b) the portion may be shown incomplete as in
Figure 8-12(B) with broken line and ccPART OF"
omitted.
ACTUATOR
END
SIA
00=0. ~
ckkb
FIGURE 8·12 - IDENTIFICATION OF PORTIONS
OF ITEMS
15-8.5.2 Identification of Rotary Switch Parts
When parts of rotary switches are designated
SIA, SIB, SIC, etc., the suffix letters A, B, C,
etc., shall start from the knob or actuator end
and be assigned sequentially away from this
position. Each section of the switch shall be
shown viewed from the same end as shown in
Figure 8-11. When both sides of a rotary switch
section are used to perform separate switching
functions, the front (knob or actuator end) and
rear symbols should be differentiated by appropriately modifying the reference designation,
for example, SIA FRONT and SIA REAR. See
switch SI of Figure 8-19.
CA)
T81
TB.2
FED
(A)
FIGURE 8·10 - IDENTIFICATION OF PARTS
BY SUFFIX LETTERS
(BLANK TERMINALS
T81
A>-r-
0
.... ,I J2-A
I
't'
"2-B
<
<
~
P3-4
~
P3-1
~O
:
9
E J2-F
>
00
o 0
~
6
~
(8) GRAPHIC SYMBOL
FIGURE 8-11 - TYPICAL DEVELOPMENT OF A
GRAPHIC SYMBOL COMPLEX ROTARY SWITCHES
"2-0
P3-5
P3-6
TBt-I
0
TB2=3 0
T"~A
T85-7
0
0
FIGURE 8·13 - IDENTIFICATION OF INDIVIDUAL
TERMINALS
16
ELECTRICAL AND ELECTRONICS DIAGRAMS
15-8.6.2 Numbers
The number portion of the reference designation shall follow the letter or letters without
hyphen or space and shall be of the same size
and on the same line; for example, CI, S14, and
MG5. The assignment of numbers should preferably start with the lowest number in the upper
left-hand corner of the Schematic Diagram and
proceed consecutively from left to right and top
to bottom throughout the drawing.
When items are eliminated as a result of a
drawing revision, remaining items should not be
renumbered. For circuits showing many items, a
table may be used to show which numbers are not
used and the highest numbered reference designations, as shown in Figure 8-14.
This table may include any or all types of
items and shall be located; conveniently near
notes or other tabular information.
~
15-8.5.5 Detached Contact (Contact Separation) Methods
Switching circuit functions may be more
clearly shown, and bends and crossovers substantially reduced by showing the contacts of
switching devices separated from each other
and from the operating device (coil). Unused
contacts need not be delineated on diagram if
listed separately.
In Figure 8-17, relay contacts have been
shown spaced from the coils to facilitate understanding the circuit functions. Mechanical linkage lines shown between elements of multielement switching devices and reference designations for identifying individual contacts may
both be omitted when the association of elements is clear. Functional designations not intended to convey surface marking information
may be aligned along one edge of the Schematic
Diagram instead of being shown at the graphic
symbol.
The circuit function presentation of Figure
8-17 may be improved by completely separating
the switching device elements as shown in
Figure 8-18. The association of the elements is
shown by means of" reference designations and
contact designations. If the Schematic Diagram
is complex, it may be necessary to show the
complete graphic symbol of the contacting device elsewhere on the diagram with zone locations of the device elements. In Figure 8-18,
the switching function symbols are used instead
of the contact symbols shown in Figure 8-17.
15-8.6 Reference Designations
Reference designations are combinations of
letters and numbers which identify items shown
on the Single-Line or Schematic Diagram. These
reference designations serve to identify the same
items on related documents, such as the Assembly Drawing and Connection Diagram. All graphic
symbols of separately replaceable items shall
be identified by an appropriate reference designation located as near as practicable to the
graphic symbol. In addition, items not separately
replaceable may be identified as required. Mounting devices for electron tubes, lamps, fuses,
etc., are not usually shown or identified on
Schematic Diagrams. For application of partial
reference designation prefixes see 15-8.10.1. The
use Qf reference designations in this Standard
conforms to the Unit Numbering Method of Y32.16.
The use of other reference designation methods
shall conform to the requirements of the particular application, and the method shall be explained.
15-8.6.1 Letters
For the selection of reference designation
letters, refer to USA Standard, Electrical and
Electronics Reference Designations Y32.16.
HIGHEST
REFERENCE
DESIGNATIONS
R6S
I
C3S
REFERENCE
DESIGNA TIONS
NOT USED
R 7, R9
R60, R62
I
ell, C 14
C19, C23
FIGURE 8·14 - TYPICAL TABLE INDICATING
OMITTED AND HIGHE'ST NUMERICAL
REFERENCE DESIGNATIONS
15-8.6.3 Type Designations
Electron tubes, semiconductors and other
devices with standard type designations shall
be identified by reference designation and type
designation. Below the type designation, the
circuit function may also be indicated. This information should be located immediately adjacent
to the symbol, preferably above it, as shown in
Figures 8-15,8-19, and 8-23.
V5
3SC5
OUTPUT
7
===
~
__
2
I
6
V7B
17AU7
DET
Q3
2N335
1ST IF
~
FIGURE 8-15 - REFERENCE DESIGNATION
TYPE DESIGNATION AND FUNCTION- '
ELECTRON TUBES AND SEMICONDUCTORS
17
USA STANDARD DRAFTING PRACTICES
15-S.7 Numerical Values
Numerical values of resistance, capacitance,
inductance, voltage, etc., should be specified
in a numerical form requiring the indication of
the fewest ciphers (zeros). This can best be
done by using the multipliers of Table S-1 in
combination with a basic unit; for typical applications see 15-S.7.2, 15-S.7.3, and 15-S.7.4.
In these applications the symbol of method 1 is
shown. Method 2 may also be used.
15-S.7.3 Capacitance
Capacitance val ues should be expressed in
picofarads or in microfarads as follows. (The
term "picofarad" has replaced the older term
C Cmicro microfarad.")
Range in
Picofarads
Less than
10,000
10,000 or
more
Table 8-1 Multipliers
Multiplier
10 '2
Prefix
Symbol
Method
Method
1
2
tera
T
T
giga
G
G
10 6
(1,000,000)
mega
M
M
10 3
(1000)
kilo
k
K
10-3
(.001)
milli
m
10- 6
(.000001)
micro
p.
U
nano
n
N
pico
P
P
femto
at to
f
a
F
A
10
9
10- 9
10-
12
10- 15
10- 18
Express as
Example
picofarads
152.4pF
4700j>F
.015p.F
30p.F
microfarads
15-S.7.4 Inductance
Inductance values should be expressed in
henries, millihenries, or microhenries. For example, 2p.H should be used instead of .002mH
and 5mH should be used instead of .005H or
5000p.H.
15-S. 7.5 Notes
To avoid repeating abbreviations of units of
measurement which are generally applicable
throughout the diagram, a general drawing note
may be used and only the numerical value need
be specified on the diagram. A recommended form
of the note is:
UNLESS OTHERWISE SPECIFIED: RESISTANCE
VALUES ARE IN OHMS. CAPACITANCE VALUES
ARE IN MICROFARADS.
or
CAP ACITANCE VALUES ARE IN PICOFARADS.
MILLI
An alternative note for specifying capacitance
values is:
CAPACITANCE VALUES SHOWN AS NUMBERS
EQUAL TO OR GREATER THAN UNITY ARE IN
pF AND NUMBERS LESS THAN UNITY ARE IN
p.F.
15-S.7.1 Commas
Four digit numerical values shall be shown
without commas. For example, 4700 and not 4,700.
15-S.7.2 Resistance
Resistance values should be expressed in
ohms, kilohms or megohms as follows:
Range in Ohms
Express as
Less than 1000
ohms
1000 to 99,999
100,000 to
999,999
1,000,000 or
more
ohms or
kilohms
kilohms
or megohms
mego ms
R3
1M
Example
~
.031
470
R3
OR
-'VVv-1M
IS00
15,S53
10k
S2k
220k
.22M
3.3M
-ANY-R3
1M
FIGURE 8-16 - METHODS OF NUMERICAL VALUE
AND REFERENCE DESIGNATION PLACEMENT
IS
ELECTRICAL AND ELECTRONICS nIAGRAMS
Circuit voltage values at significant points (tube
pins, test points, terminal boards, etc.)
Significant circuit resistance values at designated leference points (information may be in
tabular form)
Zones (grid system) on complex Schematics.
When technical data is prepared from engineering drawings, zone reference may bet the same.
Circuit element zone locations (on complex
Schematics) in tabular form on the drawing or
associated document when such location information will facilitate use of the Schematic.
Signal flow direction in main signal paths shall
be emphasized.
15-8.7.6 Numerical Value and Reference
Designation Placement
Numerical values and reference designations
shall be located as near as feasible to the symbol. Preferable arrangements are shown in Figure
8-16. Multiplier symbols are shown to indicate
multiples of a basic unit.
15-8.8 Functional Identi/icationo/ Parts
Some parts may require special functional
identification. Such information may be applied
when it will contribute substantially to the readability of the circuit. Functional designations
which are to be marked on chassis or panel surfaces shall be shown on the diagram adjacent to
the applicable symbol.
15-8.10.1 Partial Reference Designation
Prefix
When it is necessary that a Schematic Diagram convey for maintenance purposes the location of a part within an overall unit consisting
of one or more subassemblies, the notation REF
DESIG PREFIX foilowed by an appropriate reference designation prefix shall be used, as shown
in Figure 8-22. The notation and prefix shall be
placed in the upper left corner of the mechanicalgrouping boundary line enclosure of the subassembly immediately below or following the
subassembly name. By preceding the part or
subassembly reference designation, the prefix
conveys location within each sub-assembly level
of the unit. For example, the reference designations of parts within Al would be prefixed by
3Al, indicating that part is in subassembly Al
and that Al is within unit 3. For parts within
amplifier ARI, the prefix is 3AIARI. The complete locational reference designation for C2 of
ARl, for example, would be 3AIARIC2.
15-8.9 Test Points
In addition to the reference designation, test
points shall be identified on a diagram, by one
of the following methods:
(a) with the letters uTP" followed by a number
suffix. The number suffix should be assigned on
the diagram in sequence for troubleshooting convenience.
(b) with a special distinguishing symbol to indicate the test polnt category (for example, major,
secondary, or minor). Test points within each
category may be identified by designation numbers or letters.
(c) with the test function indicated below the
reference designation.
15-8.10 Additional Circuit In/ormation
The following additional information, as applicable, may be included on Schematic Diagrams.
When diagrams are specifically prepared for
maintenance purposes, as much of this information as is applicable shall be included. Additional
informacion should not be limited to the items
noted in this paragraph.
DC resistance of windings and coils (if more
than one ohm)
Critical input or output impedance values
Wave shapes (voltage or current) at significant
points
Wiring requirements for critical ground points,
shielding, pairing, etc.
Power or voltage ratings of parts
Indication of operational controls or circuit
functions
Caution notation for electrical hazards at maintenance points
IS-8.ll Examples 0/ Schematic Diagrams /or
a Complete Item
Figure 8-19 is an example of a conventional
Schematic which adequately serves manufacturing
purposes.
Figure 8-20 is an example of a schematic
wherein each stage is identified for ease in
understanding its function. In this form it may be
readily converted to add or emphasize maintenance information in accordance with 15-8.10, in
which case it will be similar to Figure 8-21.
Figure 8-21 is an example of a maintenance
schematic in which the signal path is emphasized.
19
USA STANDARD DRAFTING PRACTICES
MONItOR
POSITION
,..---..
IE
..
T
CI
8.560.72
(A)
R2
1260
SI
TALK
MON ....... OISC
3
INCOMING
TRK CKT
P
LI
C3
.5
2
JI
4
200
3
P
2
2
3
. I
2
2
600
I
C4
1.071.09
:80
5
R3A
67
P
R6
I
I
I
-------~
C2
8.568.72
(0)
I
I
I
R3B
67
I
I
R
I
4T
2T
3
:t I
KI
SLEEVE A
TO
ANSWERING
JACK AND
LAMP CICT
K6
SLEEVE B
IV'C
S
C
C
I
K3
!
2T
3~C
:
~-t+O""'--------'''l:
:
~!
I
PAD CONT : 5T
4T
-~~,~c~-------------------_4-8--V 68 6T
:
!
:
1300
I
I
-24V~~-3------------------~---~
I
_24V~5
INCOMING
TRK CKT
BL
:
-------------------------.f~;----------------------~-=~c~
3.: 4B
210
~
SB:4l
~
I
~~c~~-------------------------
GRD BUS
2
~
.--.
-48V
NOTE 2
---[>C
21 - 26V - - - - 2 4 V
BAT. BUS
45-S0V
BAT. BUS - - - - 4 B V
NOTES:
I. UNLESS OTHERWISE SPECIFIED
RESISTANCE VALUES ARE IN OHMS
CAPACITANCE VALUES ARE IN MICROFARADS
2. PROVIDE -Z- OPTION WHEN BUSY
LAMP CIRCUIT IS USED
3. FOR INFORMATION CONCERNING RELAY
TERMINAL IDENTIFICATION. SEE
STANDARD PRACTICE XX X
4. TERMINAL NUM~RING FOR SI IS FOR
REFERENCE ONLY. RELATIVE LOCATION OF
TERMINALS AND MARKINGS IS SHOWN
IN DIAGRAM BELOW.
SI
DISC
TALK
MON
OPERATING END
FIGURE 8·17 - TYPICAL SWITCHING·CIRCUIT SCHEMATIC DIAGRAM
(USE OF JUNCTION DOTS OPTIONAL)
20
ELECTRICAL AND ELECTRONICS DIAGRAMS
~
MONITOR
POSITION
51
TALK
MON
NL KEY
'0:.
~
,
I
k2
SI
TALK
DISC
L KEY
28
28
CI
8.56 - 8.72
RIA
67
RIB
67
T
I
R6
600
R2
1260
INCOMING
TRK CKT
I
3
2
P
P
K2
51
TALIC
DISC
L KEY
2C
C2
8.56-8.72
C4
1.071.09
C3
.5
2
K5 4 PAD
CONT
IT
K6
3
2
A
IT
R
I
K2
3
4T
~1---2"""'II-B~--=3;;::M~I~:~~8~5-"'''''''''';S~
C
4M
C
PAD SHORT
3
5
2T; I
I
5-1800
K3
NOTE 5
KI
~8y~~5~T~______~KI~5~_________~~~:~_~
TO
ANSWERING
JACK AND
LAMP CKT
K6
SLEEYE 8
KI
K2
. ----UZ5OO
KI
R3B
67
R3A
67
k4
2T
P
3
-24Y--~6~T~)*(~5--~3~1-,~t~----T~--~L.
"C
28
K3
PAD CONT
L...L Tg,,:'g~i
-Z4Y
AAA
K6
-48Y,--~~--~)f~--E>-
NOTES:
I. UNLESS OTHERWISE SPECIFIED:
RESISTANCE VALUES ARE IN OHMS
CAPACITANCE VALUES ARE IN MICROFARADS.
L-5~~~;~i~::---C---:4::T-l)~(-=3:--"'1>c
INCOMING .:;.BL':'-_ _
r,b
""T"'_~KM3_--r_ _ _ _ _
TRIC CICT
,--5~B...,:~14~..II1
3
C.
2.
:iI"'.-J--r--48
48
3.
FOR INFORMATION CONCERNING RELAY
TERMINAL IDENTIFICATION. SEE
STANDARD PRACTICE XXX.
4.
TERMINAL NUMBERING FOR 51 IS FOR
REFERENCE ONLY. RELATIYE LOCATION
OF TERMINALS AND MARKINGS SHOWN IN
DIAGRAM BELOW.
51
0
o r 0
2 A
DISC
I
0
0 1
TALK
10
0
C 2
~ B
MOM
s 0 0 0 0 ,
5.
K3 RELAY, CONTACTS 1-28 MAKE
BEFORE CONTACTS 1-3 BREAk.
GRD BUS ----t>C
~T~~S
-24Y
45-SOY
BAT. BUS
-"8Y
PROVIDE ·Z· OPTION WHEN BUSY LAMP
ctRCUIT IS USED.
Y
TERMINAL ENO
FIGURE 8-18 - CONTACT-SEPARATION METHOD OF SCHEMATIC REPRESENTATION
(CIRCUIT SAME AS SHOWN IN FIGURE 8-17)
21
OPERATIfiCG END
USA STANDARD DRAFTING PRACTICES
(
4
EI
r--------------------------------------------------------I
AM
LOOP
I
I
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22
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L8
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NOTES:
I. UNLESS OTHERWISE SPECIFIED
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CAPACITANCE VALUES ARE IN PICOFARADS.
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4. TERMINAL NUMBERING FOR SWITCH SI IS FOR REFERENCE ONLY.
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C40C ...,
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DESIGNATIONS
C421 L9 R43
SWITCH SECTIONS AND TERMINALS CONNECTED
POS FUNCT I ON 1--:=-=-="",ST'A",=-:-::--+=::-:==jSI=8--=-:::-:-:::-+::=~SrlC'-::::::-:-;:---i
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12-1
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-
LSI
-
REFERENCE
DESIGNATIONS
N~T USED'---i
SO-8021S1
ELECTRICAL AND ELECTRONICS DIAGRAMS
(
VSA
SAV6
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+165V
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RIGHT OF TABLE. SWITCH IS SHOWN VIEWED FROM FRONT
WITH KNOB IN EXTREME CCW POSITION,
NOTES:
I. UNLESS OTHERWISE SPECIFIED
RESISTANCE VALUES ARE IN OHMS,
CAPACITANCE VALUES ARE IN PICOFARADS.
4 3
3. SWITCH S2 IS PART OF POTENTIOMETER R34.
FIGURE 8·20 - TYPICAL SCHEMATIC DIAGRAM
PT OF TlO
BR
I
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23
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2
8-9
3
9-10 6-7,12-1
6-7,11-12 II -12
12-1
HIGHEST
REFERENCE
DESIGNATIONS
SI
C42 L9
R43
USA STANDARD DRAFTING PRACTICES
(
V8A
6AV6
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NOTES:
I. UNLESS OTHERWISE SPECIFIED
RESISTANCE VALUES ARE IN OHMS,
CAPACITANCE VALUES ARE IN PICOFARADS.
R
Y
115V
L9
Y
60 CIS
8K
DIAL
LAMPS
FIGURE 8·21 - TYPICAL MAINTENANCE TYPE-SCHEMATIC DIAGRAM
24
2. VOLTAGES MEASURED TO COMMON
WIRING WITH VTVM.
4. TERMINAL NUMBkRING FOR SWITCH SI IS FOR REFERENCE ONLY.
RELATIVE LOCATION OF TERMINALS IS SHOWN IN DIAGRAM AT
RIGHT OF TABLE: SWITCH IS SHOWN VIEWED FROM FRONT
WITH KNOB IN E;XTREME CCW POSITION.
R34
TERMINAL
SIDE
3. SWITCH S2 IS PART OF POTENTIOMETER R 3 4 . @ 2
TERMINAL NUMBERING IS FOR REFERENCE
1° °2
ONLY. RELATIVE LOCATION OF TERMINALS
4
IS SHOWN IN DIAGRAM AT RIGHT.
5:3 2 I
POS FUNCTION
(~~g~~)
SWITCH SECTIONS AND TERMINALS CONNECTED
SIA
SIB
SIC
f1P.ONT REAR FRONT REAR FRONT REAR
3-4
5-6-7
2 AM RADIO 3-5,8-94-6-7,11-1
8-9
:3 FM RADIO 3-6,9'1045'7,12'1
9-10 6-7,12-1
6-7,IH2" - 12
12-1
8-9
HIGHEST
REFERENCE
DESIGNATIONS
SI
C42 L9
R43
'.,
)
l
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TRAM'MITTER-RECEIVER
AI
CONTROL PANEL
REF DESIO PREFIX 3AI
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TT
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t""'
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+24V
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§
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SIG (.
INPUTS·
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PAUlA&. R[FElIDlCE DESlCIlATlOIIS AlE 1lI0II.
'01 CCIIPLm DESIUATlOII'flREFII WITN IlIIT
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FIGURE 8.22 - TYPICAL APPLICATION OF CIRCUIT RETURN SYMBOLS
o
SYIIIOL
I
(J)
USA STANDARD DRAFTING PRACTICES
15-8.12.3 DC Continuity and Discontinuity
When the circuit includes DC and RF signals, DC continuity should be clearly shown. See
A3 and A5 of Figure 8-24. MT2 illustrates method
of indicating DC discontinuity. The discontinuity
symbol is used to indicate absence of direct
electrical connection between a waveguide and
the outer conductor of a coaxial cable at a point
where the tr:ansmission paths change from waveguide to coaxial or vice versa.
15-8.12 Single-Line Diagrams lor Microwave
Circuits
Single-line symbols shall be used in representing coaxial and waveguide parts on microwavecircuit Schematic Diagrams. For the auxiliary
portions of the circuit such as power supply or
controls, single-line or complete symbols may
be used. For sample diagram, see Figure 8-24.
15-8.12.1 Transmission Path Recognition
Symbol
Type of transmission path, such as coaxial
or waveguide, need be indicated only at each end
of a path as long as the path remains of the same
type. See waveguide path from CPI to MT2 via
A4, AS and A6 on Figure 8-24. Additional recognition symbols may be shown as required for
further clarification.
15-8.12.4 Pressure Seals
When it is necessary to indicate that certain
path sections of waveguide are sealed from other
paths of the circuit, a note similar to note I of
Figure 8-24 shall be used. This particular note
indicates that the path from EI via AIHYI, CPI,
A2S2, DCl, and ZI is a sealed path.
15-8.12.2 Connector and Flange Symbols
Transmission path separable connectors or
equipment flanges shall be identified only when
it is necessary to indicate the elecuical function or separable feature of these parts. See
representation of M2 and WI in Figure 8-24.
15-8.12.5 Subassemblies
Subassemblies such as mixers may be shown
with all parts represented as shown in A7 of
Figure 8-24, or, if such ietailed representation
is not essential, a general overall symbol may
be used as shown for A7.
R3
240
EI
E5
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0-000-
E2
Q~
E4
Ea
E4
RI
~:1~3~~ ~
____
____- L_ _ _ _ _ _
~
______
~E~5~
(A)
TERMINALS USED
R3
240
3
3
4
~
2
CRI
2 1N696 2
PRINTED CIRCUIT USED
AS PLUG-IN ELEMENT
5
GRAPHIC sneoL USED ON
OVERALL SCl£MATIC
(8)
R3
240
~PI
PART
OF PI
r--JV'tJ"--r~3
"-:-::~""""----~4
2~-
REPLACEABLE PLUG
PHYSICAL ARRANGEMENT
TERMINATIONS
OF clRCurr
__""'-'
~--~---L------~----~--------~~5
(C)
SCHEMATIC REPRESENTATIONS
FIGURE 8-23 - SCHEMATIC REPRESENTATION IN RELATION TO TERMINATION METHOD USED
26
5
l
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NOTES:
I.
r-----,
IANTENNA I
r----
DRIVE .I
IL. ____
THIS CONNECTION SEAlS)
TO MAINTAIN A PRESSURE
DIFFERENCE OF 15 PSIG
NOTE I
2. REMOVE "X· OPTION AND
PROVIDE ·Y"OPTION FOR
TEST PURPOSES ONLY
3. PARTIAL REFERENCE DESlGNA-
lc:t:~S:fo.FOR
PREFIX WITH tNT tUIBER
AM) SlI8ASsaa Y DESIGNA-
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---~""---1""J.
BU"
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CIRCUIT
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2~~~
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L _ £________ ________
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B ~ F.'~ENCY
________________~..~
FIGURE 8-24 - TYPICAL MICROWAVE-CIRCUIT SCHEMATIC DIAGRAM
~
en
USA STANDARD DRAFTING PRACTICES
15-9 Schematic Diagrams (Power Switchgear and
Industrial Control)
The following subparagraphs contain detailed
information specifically applicable to Power
Switchgear and Industrial Control Schematic Diagrams. This material is to be used as a supplement to the general standards of 15-7.
15-9.1.1.2 Current Trans formers
Where current transformers are the multiratio type, both the maximum current ratio and
the ratio of the tap to which the external circuit
is connected should be shown as indicated in
Figure 9-2.
15-9.1 Contents
A Schematic Diagram shows in the simplest
manner the circuits and functions of the component devices or parts of the electrical equipment. Consideration shall be given to inclusion
of the following information.
15-9.1.1 Device Ratings (Fuses, Resistors,
etc.)
Note: Industrial Control Schematic Diagrams
may omit device ratings when they are used as
standard drawings applying to more than one
rating.
15-9.1.1.1 Rating Location
Device ratings should be located close to
the device symbol to assure correct identification. For example, see ratings of 40 amperes for
the fuse, Figure 9-1(A); 3300 ohms for the resistor, Figure 9-1(B); 200/5 (amperes) for the
current transformer, Figure 9-1(C); and the voltage ratio for the 115000-115 volt potential transformers, Figure 9-1(0). Polarity marks shall be
shown on all instrument transformers.
FIGURE 9·2 - TYPICAL MUL TI·RATIO
CURRENT TRANSFORMER RATING
15-9.1.2 Explanatory Notes
Where die function is not clear, explanatory
notes should be added for clarification. For example, the note adjacent to device 23 in Figure
9-3 indicates that the contact cIo ses at 40 F on
decreasing temperature. Where notes are lengthy
or need repeating they may be shown at a common location with proper reference at the point
of application.
3300
40AMP
OHM
(C)
(8)
(A)
LtG
rrr
23
II'
CLOSES AT 40 F
DECREASING
115000-115
lit
HTR
200W
(0)
FIGURE 9·1 - TYPICAL LOCATIONS FOR
DEVICE RATINGS
FIGURE 9·3 - TYPICAL DEVICE FUNCTION
EXPLANATORY NOTE
28
ELECTRICAL AND ELECTRONICS DIAGRAMS
15-9.1.3 Wire and Terminal Designations
Wire or terminal (or both) designations identify the conductors and terminals and facilitate
checking of circuits. The use of wire or terminal
(or both) designations should be determined by
the overall adaptability to the design, assembly,
installation, and maintenance of equipment.
Simple designations are desirable as illustrated
in Figure 9-4.
15-9.1.4.1 Designations Denoting a Function
Designation numbers, characters and
symbols also denoting a function may be chosen.
The following are a few examples:
Designation
1
2
3
A
B
C
101"-WIRE NUMBERS
52Y
101
52X
102
A.
103
~---~~l-2--~--~7V-B---'-TERMINAL NUMBERS
(B)
8
103
(A)
FIGURE 9-4 - TYPICAL TERMINAL AND
WIRE DESIGNATIONS
Phase A
Phase B
Phase C
P
N
C
T
R
G
A
AP
A+
Positive
Negative
Close
Trip
Red Lamp
Green Lamp
Alarm
Alarm Positive
Alarm Positive
1-1
1-2
1"'3
A-A
A-B
A-C
Unit 1, Phase 1
Unit 1, Phase 2
Unit 1, Phase 3
Unit A, Phase A
Unit A, Phase B
Unit A, Phase C
LI
L2
L3
Line 1
Line 2
Line 3
+
Positive
Negative
Neutral
±
15-9.1.4.2 Designations Denoting Location
Designations may also be used to denote
location as well as function. Figure 9-5 illustrates standard identification of bushing type
current transformers and leads. See NEMA SG4
Part 3. Designation IYl, for example, denotes
that the connection originates on circuit breaker
pole 1 as indicated by the first digit, the letter
Y denotes the upper transformer (further removed
from the breaker contacts) and the last digit 1,
the secondary winding tap number.
15-9.1.3.1 Designation Location
Whenever possible, all wire design~tions
should be located either above or to the nght of
its line and terminal designations either below
or to th; left of its symbol as indicated in Figure
9-4. However, any other consistent system of
wire and terminal designation 10 cation may be
used.
15-9.1.4 Wire Designations
Wire designations are usually arbitrary identifications assigned to specific conductors.
These may comprise a series of numbers, characters or symbols, or combinations of each, or
both. The following are a few examples:
1, 2, 3, etc.
A, B, C, etc.
+, -, ±, etc.
Function
Phase 1
Phase 2
Phase 3
15-9.1.4.3 Assigned (Wire) Designations
The assigned wire designation for a continuous electrical connection should be retained
whenever practicable until the circuit characteristic is altered. Figure 9-11 illustrate s good
drafting practice in this respect. In many ins.tances it is not practicable to retain the same
wire designation throughout because of established terminal marking standards, differences in
1-1, 1-2, 1-3, etc.
A-A, A-B, A-C, etc.
A+, A-, lA+, etc.
I-AI, 2-Al, 3-Al, etc.
29
USA STANDARD DRAFTING PRACTICES
design, drafting and manufacturing practices.
However, the same designation shall be used between any two interconnected points. Figure
9-10, "52 Closing Circuit" and cc52 Tripping
Circuit," illustrates good drafting practice in
this' respect.
15-9.1.5 Terminal Designations
Standard terminal designations have been
applied to electric power apparatus such as
motors, generators, transformers, etc., and are
covered in USA Standard Terminal Markings
for Electrical Apparatus C6.1 and for power circuit breakers in USA Standard Power Circuit
Breaker Control C37.11. Where no standard terminal designation exists, amitrarily chosen designations may be used similar to the method described in 15-9.1.4.
6
devices has been shown for illustra.tive purposes only. The terminals for each of the panels
where these devices are located shall be shown
in their proper po sition in the circuit. The interconnecting wires required between the panel
terminals can thus be seen. Reference may be
made to the associated interconnection diagrams.
However, any other consistent system of device,
terminal and interconnecting designations may
be used.
1 - - - - - 1 I 5 V AC CONTROL SOURCE---....
DEVICE FUNCTION DESIGNATION
EQUIPMENT LOCATION
(NTERCONNECTION WIRE DESIGNATION
( (
4
X
I
TR-A
WI
CR·S
W2
W3
Y
o-~I~~--o-~~-o--o---iM-C~-<~
2
S
9
TERMINAL
DESIGNATION
2
7
L.;;W;.;;;2;"'O_-{IM-A .....- - - - .
4
IM-A
1-..---~~----~2M~~---~
DEVICE LOCATIONS:
IM-A ON PANEL A
2M-A ON PANEL A
TR-A ON PANELA
CR-S ON PANELS
M-C ON PANELC
~
.l
TERMINAL POINT
CONNECTION)
Y (EXTERNAL
FIGURE 9-6 - TYPICAL SCHEMATIC DIAGRAM
SHOWING TERMINAL AND INTERCONNECTION
DESIGNATIONS
5
15-9.1.6 Mechanism End of Power Circuit
Breaker
The location of the breaker mechanism M determines the designation numbers of the breaker
bushings and their associated current transformers. Refer to NEMA SG4, Part 3. The breaker
mechanism location with respect to the phase
identification is required for the proper connections of the current transformers. See Figures
9-7(A) and 9-7(B).
3
FIGURE 9-5 - STANDARD IDENTIFICATION OF
BUSHING CURRENT TRANSFORMERS
15-9.J...5.1 Interconnecting Unrelated Terminal Designations
Figure 9-6 illustrates good drafting practice when interconnecting electrical equipments
which have unrelated terminal designations. This
figure shows in schematic form a typical industrial control circuit. The location of the various
15-9.2 General Layout
The arrangement of the diagram should show
all circuits in the clearest manner. The following requirements shall be observed in the preparation of the diagram.
30
ELECTRICAL AND ELECTRONICS DIAGRAMS
2
2
3
Standard ICI, Part 3 until a
issued.
3
15-9.2.4 Device Contacts
When necessary to understand the function of
a circuit, the sequence of operation of contacts
within a conuol or protective device should be
shown on the Schematic Diagram, or reference
made to the appropriate drawings. Consideration
should also be given to cross-referencing contacts of relays or other devices which are used
in circuits remote from the operating coil. .In addition, the unused contacts of the devices may
also be shown.
PHI
52
5
USA Standard is
M
3
15-9.2.5 Circuit Arrangements
The circuits should be arranged in functional
sequence, left to right or top to bottom. However, this should not be followed rigidly where
excessi ve line crossings would impair the clarity
of the diagram. In Figure 9-8, the pressure switch
PS when closed energizes device TR, whose
time closing contact then energizes device lCR ,
which in turn energizes device M.
LOAD
(8)
LOAD
(Al
FIGUR E 9-7 - PROPE R LOCATION OF MECHAN ISM
WITH RESPECT TO BREAKER BUSHINGS
15-9.2.1 Graphic Symbols
Symbols for Schematic Diagrams are intended
to indicate the •operating functions. These symbols are shorthand graphical representation and
are not necessarily intended to represent the
physical likeness of the device nor contain complete electrical connections. Graphic symbols
shall be applied as described in 15-3.6.
y
......- - - - - - - - 1 I 5 V AC
-------~~...41
15-9.2.2 Abbreviations
Abbreviations shall be applied as described
in 15-3.7.
15-9.2.3 Device
Function
PS
Designations
....- - - - f ~--------..( TR ) - - - - - . .
15-9.2.3.1 Device Function Designations
for Power Switchgear
Device function designations as applied
to Power Switchgear shall conform wi th USA
Standard Manual and Automatic Station Control,
Supervisory, and Associated Telemetering Equipments, C37.2 or other national-level standards if
the device function designation is not covered
in the USA Standard. Those device letters
which denote parts of the main device, and those
which cannot or need not form part of the device
function designation, are generally written directly below the device function "designation, as for
TR
....- - - - f
1---------.
. . ICR
TC
~--..
leR
M
FIGURE 9-8 - EXAMPLE OF CIRCUIT
ARRANGEMENT IN FUNCTIONAL
SEQUENCE
15-9.2.6 Control Sources
Control sources should be shown by means
of horizontal or vertical parallel lines with detailed circuits between and perpendicular to
them. Note AC source X and Y shown in Figure
example, 52 or CS. If two or more devices with
LC
T
the same function designation and suffix letter
(if used) are present in the same equipment, they
may be distinguished by numbered suffixes, as
for example, 51-1, 51-2, and 51-3, when necessary.
9-8.
15-9.2.7 Physical Relationship
Physical relationship between portions of a
device ~re usually disregarded. In Figure 9-8,
the coil and contacts of device lCR are shown
separated to facilitate tracing the circuit and
its function.
15-9.2.3.2 Device Function Designations
for Industrial Control
Device function designations as applied to
Industrial Control shall conform with NEMA
31
USA STANDARD DRAFTING PRACTICES
15-9.3 Typical Schematic Diagrams
Typical Schematic Diagrams that illusuate
good drafting practices are shown in Figures 9-9,
9-10 and 9-11.
15-9.2.8 Course of Circuit
Course of each circuit should be shown in
the most direct path. Refer also to 15-7.1.
15-9.2.9 Horizontal and Vertical Lines
Lines between symbols should be horizontal
or vertical with a minimum of line crossings, and
with spacing to avoid crowding. Refer to 15-7.2.
15-10 Connection Diagrams
Material for this paragraph has not yet been
approved as USA Standard. Material approved
by the Sectional Committee has been published
as a Proposed '(}'SA Standard for uial use
(see page 39). Industry comments are welcomed
and will be considered before final adoption of
this section as a USA Standard.
15-9.2.10 Phasing Indication
Phasing of alternating current components
should be indicated so that there is general
agreement with the actual physical arrangement
and suitable notes applied where necessary.
When physical arrangement is not the governing
factor, the phasing should be indicated in sequence, 1, 2, 3, N from left to right or top to
bottom.
15-9.2.11 Polarity Indication
Polarity of direct current components should
be indicated with a up" or U+" for positive,
uN" or (-) for negative, and CCPN" or ± for neutral. Direct current busses should be shown in
sequence, positive, neutral, negative from left to
right or top to bottom when physical arrangement
is not the governing faccor.
15-11 Interconnection Diagrams
Material for this paragraph has not yet been
approved for circulation as a Proposed Standard.
15-12 Terminal Diagrams
Material for this paragraph has not yet been
approved as USA Standard. Material approved
by the Sectional Committee has been published
as a Proposed USA Standard for trial use
(see page 66). Industry comments are welcomed
and will be considered before final adoption of
this section as a USA Standard.
32
ELECTRICAL AND ELECTRONICS DIAGRAMS
:
115KV BUS
II
==::=:==:=============================================== = H-I "'~~:H=2=H:I~:H=2=H=I
..t;1-H=2====II'
NC }
~
67G
8 7 NCO
ICII
115000-115
PWRTRANS
NEUT CT
SEE DWG-
ICO
5 6
6 X 5, 4 X 5, 2 X 5
VM
2CI
WM
5X5
AM
2CO
2 6
2
4 8
2 4
VARM
6 8
BUS DIFF
SEE DWG-
51
66400-115
AS
AC TIME OVERCURRENT
RELAY
AC CIRCUIT BREAKER
AC DIRECTIONAL
OVERCURRENT GROUND
RELAY
AMMETER SWITCH
~I'
VS
M
VOLTMETER SWITCH
BREAKER MECHANISM
52
67G
.....-+---.
:=LX2~}SYN
:=r'1'
~
SEE DWG-
DRAWING REFERENCES
DC SCHEMATIC DIAGRAM ... FIG 9-10
DEVICE INTERNAL CONNECTION
DIAGRA ..... FIG 10-14
LINE I
FIGURE 9·9 - TYPICAL POWER SWITCHGEAR AC SCHEMATIC DIAGRAM
(USING BOTH TERMINAL AND WIRE DESIGNATIONS)
33
USA STANDARD DRAFTING PRACTICES
1 5 2 CLOSING CIRCUIT
8-1
+
52 TRIPPING CIOCUIT---1
TP
II
I
ICI'
CPI
I
IC
7
RL
SS
NOTE I
G
5
5
52
7
52X 2
52
LC
52Y
6
52Y
5
2
2C
CS
2
T
2
3
9
52
4
2
:r tIll
5
15AMP
I
52545658
23 {WSES
AT 40F
DECREASING
115V
AC
EXTRA AUXSW
I
52Y 2
2
6
2
I
15AMP
10
6
8-1
2
8
23
51
52
52X
52Y
676
HTR
200W
52
TC
NOTE I
6
V
14
12
CONTROL POWER
DISCONNECTING SWITCH
TEMPERATURE CONTROL
DEVICE
AC TIME OVERCURRENT
RELAY
AC CIRCUIT BREAKER
00 AUXILIARY SWITCH
OPEN WHEN THE
OPERATING MECHANISM
IS IN THE NON-OPERATED
POSITION
CC CLOSING COIL
LC LATCH CHECK SWITCH
TC TRIP COIL
87X
2
52
53 55 57
52
I
14
4
1
67G
8-2
51
52
52X
I
51-3
2
T
13
ao
I
51-2
51-1
2
X
52X
~52X
T
9
13
6
CS
3T
CP
5
125V
DC
3
40
AMP
CS
87X
CS
HTR
55
~
GL
RL
10
DIFFERENTIAL PROTECTIVE
AUXILIARY RELAY
CONTROL SWITCH
C CLOSE
T TRIP
HEATER
SYNCHRONIZING SWITCH
AC CIRCUIT 8REAKER TERMINAL
BLOCK STUDS FOR EXTERNAL
CONNECTIONS
GREEN LIGHT
RED LIGHT
NOTE I
JUMPERS INSTALLED BY MANUFACTURER
CLOSING RELAY
ANTI-PUMP RELAY
AC DIRECTIONAL
OVERCURRENT GROUND
RELAY
DRAWING REFERENCES
AC SCHEMATIC DIAGRAM .. FIG 9-9
DEVICE INTERNAL CONNECTION
DIAGRAM .. FIG 10-14
FIGURE 9.10 - TYPICAL POWER SWITCHGEAR DC SCHEMATIC DIAGRAM
(USING BOTH TERMINAL AND WIRE DESIGNATIONS)
34
~
ELECTRICAL AND ELECTRONICS DIAGRAMS
OL
AC
POWER
LI
LII
L2
Ll2
L3
Ll3
STOP
START
-L
3
10
MAIN CONTACTOR
ACCELERATING
CONTACTOR
TR TIMING RELAY
ICR AUXILIARY CONTROL
RELAY
2CR AUXILIARY CONTROL
RELAY
M
A
OL
TC
OVERLOAD RELAY
TIME CLOSING
CONTACT
ICR
2CR
FIGURE 9-11 - TYPICAL INDUSTRIAL CONTROL SCHEMATIC DIAGRAM
35
5
PROPOSED
USA
STANDARD
DRAFTING
PRACTICES
ELECTRICAL AND
ELECTRONICS DIAGRAMS
USAS Y14.15· 1966
15-10 CONNECTION DIAGRAMS
15-12 TERMINAL DIAGRAMS
ELECTRICAL AND ELECTRONICS DIAGRAMS
quirements which are common to all of them. The
paragraphs that immediately follow cover these
common requirements, and while they will apply
to a greater extent to continuous- and interruptedline diagrams, the same requirements are applicable to tabular-type diagrams. The common
requirements paragraphs are followed by paragraphs on specific requirements applicable to the
different types of diagrams covered in this standard.
15-10 Connection Diagrams
The following subparagraphs contain information generally applicable to the preparation of
all types of Connection Diagrams.
15-10.1 purpose
(a) Furnish information showing electrical
connections between component devices or parts.
(b) Facilitate determination of electrical connection adequacy.
(c) Facilitate maintenance of equipment.
(d) Supplement Schematic Diagrams by relating
circuit information with the actual wiring and
location of component devices or parts.
15-10.3.1 Equipment Views
The view or views of an equipment that are
required for a Connection Diagram are those
which will most clearly show the terminals or
wiring sides of the component devices or parts
as they are mounted in the equipment. In most
instances, one view as seen from the wiring side
of the items should be sufficient. This view will
generally correspond to the view of the items
as seen during wiring. More than one view is
usually required when the equipment is wired
from both front and rear. Component devices or
parts with more than one level of terminals may
also require more than one view. Typical examples of the type of equipment arrangement for
which more than one wiring view is needed are
shown in Figures 10-I(B) and 10-2(B). The Connection Diagram representations of these views
are shown in Figures 10-I(C) and 10-2(C).
15-10.2 Types
Connection Diagrams covered in this standard
fall into three classifications. These are the
continuous-line type, the interrupted-line type
and the tabular type. These classifications are
based on the method of indicating connections
between component devices or parts and whether
the approach for conveying this information is or
is not essentially diagrammatic. The various
methods permit a selection which will satisfy the
requirements of a wide range of equipment design.
15-10.2.1 Continuous-Line Type
In this type of diagram, continuous lines,
generally representative of the actual betweenterminal conductors or cable paths, are shown
from symbol to symbol. Two somewhat similar
methods whereby continuous-line diagrams may
be prepared will be referred to as:
(a) Point-to-Point (15-10.4.1)
(b) Highway or Cable (15-10.4.2)
15-10.3.2 Princ'ipal and Auxiliary Wiring
View Selection
When practicable, the side of the equipment
or mounting surface that shows a majority of the
wired items from the wiring side should be selected as the view for establishing a plane of
reference for the Connection Diagram. This plane
thus becomes the principal plane of reference.
For example, when wired items mount in planes
perpendicular to or at an angle to the selected
principal plane, these auxiliary planes shall be
rotated or revolved into the principal plane or
planes of the diagram.
Planes that are merely revolved in position
should be shown adjoining the principal plane or
view. See rotation of sides of equipment shown
in Figures 10-I(C) and 10-2(C). Planes such as
those identified in Figure 10-I(C) as auxiliary
planes should be oriented exactly as these equipment planes would appear when viewed from a
normal wiring position.
Auxiliary planes may be positioned at the
same location where they have been revolved or
they may be shown slightly apart from the principal view with an appropriate identification; see
Figure 10-I(C). Views represented as auxiliary
planes shall be enclosed with phantom lines in
order to define the boundary limits of these
planes.
15-10.2.2 Interrupted-Line Type
Instead of continuous lines as used in the
preceding method, connecting lines in this type
of diagram start at a symbol and are interrupted
a short distance away. Two rather similar methods whereby interrupted-line type of diagrams
may be prepared will be referred to as:
(a) Base-line (15-10.5.1)
(b) Feed-line (15-10.5.1)
15-10.2.3 Tabular Type
In the tabular arrangement of information,
15-10.6, connections between component devices or parts are listed in a FROM-TO type of
tabulation which includes all the information
necessary to identify the connections. A symbolic
or pictorial representation showing the relative
location of the component devices or parts, with
or without connecting lines, should be referenced
on or accompany the tabulation.
15-10.3 Common Requirements
While there are differences in the methods of
preparation, and types of diagrams mentioned in
the preceding paragraphs, there are certain re-
39
PROPOSED USA STANDARD DRAFTING PRACTICES
~.
--,
'~1
~~~
~
CA)
aCID
e
o •
...
---------~
L _________
I
.
0 ..II
VIEW AS MIGHT BE SHOWN ON EQUIPMENT DRAWING
TOP VIEWING DIRECTION
VIEWING DIRECTION &
WIRING SIDE OF FRONt
PANEL (UPPER PART)
MOUNTED PARTS
- FRONT PANEL
CHASSIS
SIDE
VIEWING DIRECTION &
WIRING SIDE OF CHASSIS MOUNTED PARTS
CHASSIS
FRONT
(B) DIRECTIONS FROM WHICH EQUIPMENT MUST BE VIEWED FOR
WIRING AND PREPARATION OF CONNECTION DIAGRAM
.r--------------~
I ""
XOSI
I®
AUXILIARY
PlANE
0
f.':\
_~
'-Il!J
:
I
til tl2 :
L _______ ~_~
REAR VIEW OF FRONr PANELfUPPER PARr)
_ _ __ _ _ __ __
:HASS I S rqONT
1¥'R ING SIDE - ...............
!r r?i1SI
~
_LINE CORRESPOND ING
~ TO COU\40N EDGE OF
InJ
!HI
CHASSIS
SIIbI'
r--t-- ----~-
'@'
Jo
1.0
II I'i:JY
tl3
f
SIDE~ I@
CHASSIS
WIRING SIDE
I
I
160
I
I
0
r,::: ---
.. ./HOLE
(.
---,
I ~I_.: ~ .);
..
r'
,I[]'
r[;l?).XV2
I
HOLE-\
I
"'01
XVI '
~o~ ';o:o~
I
1;;;1. ,
I
--.J
rap - ViEWOF TI
AUXILIARY PUNE
o<)o~
0$0"
XV3
L_ -12 ----BOTTOM VIEW OF CHASSIS
PlANE CONTA I NI HG
LARGEST NU"'BER
OF' WIRED ITEMSPRINCIPAL PlANE
(C) CONNECTION DIAGRAM VIEWS OF EQUIPMEM'T
FIGURE 10-1 - VIEWING DIRECTIONS - TYPICAL FOR CHASSIS-TY~E EQUIPMENT
40
ELECTRICAL AND ELECTRONICS DIAGRAMS
BEla
ElEl8
PANEL A
FRONT VIEW OF PANEL. A
PANEL B
~
ITS
~
AS
AS
AS
a a D
r
T8:
L
FRONT VIEW
lUI [UJ lUI
CS (5 (5
FRONT VIEW OF AlN£L. .,
(A) VIEWS AS MIGHT BE SHOWN ON
EQUIPMENT DRAWING
(C) CONNECTION DIAGRAM VIEWS OF
EQUIPMENT
(B) DIRECTIONS FROM WHICH EQUIPMENT
MUST BE VIEWED FOR PREPARATION
OF CONNECTION DIAGRAM
FIGURE 10-2 - VIEWING DIRECTION - TYPICAL FOR CABINET TYPE OF EQUIPMENT
15-10.3.4 Component Devices or Parts Symbol Size
No attempt should be made to show exact
differences in size among component devices or
parts especially when they are basically similar
in shape or function. Differentiation between
maximum and minimum sizes shall be accomplished so that the largest shall not appear too
large nor the smallest too small. For example, a
symbol of suitable size may be used to represent
similar items when physical size variation is
minor. In general, the symbol shape shall be
drawn as small as it is convenient to do so,
consistent with a clear, well proportioned representation, and large enough to contain item or
terminal designations.
It should be noted that the viewing planes
referred to in this paragraph are primarily for
purposes of showing terminals diagrammatically
in as simple a manner as possible. For this
reason, the methods of view representation are
not bound by the rules governing the relationship
of views projected orthographically.
15-10.3.3 Representation of Component Devices and Parts
Symbols for connection diagrams are intended to represent each item or terminal of the
equipment that is to be wired. Component devices and parts may be represented with symbols
in one of two ways. The symbols may be of
simple geometric shape (rectangle or circle) or
the symbols may be of the circuit schematic type.
When the rectangular or circular shape is used
only terminal circles are shown within these
shapes. The circle shall be used only when the
component device or part shape closely approximates a circle; otherwise a rectangle shall be
used. When circuit schematic symbolization is
required as shown in Figures 10-15 and 10-16,
USA Standard Y32.2 shall be consulted.
15-10.3.5 Terminals
Component device or part terminals, standoff
terminals and binding posts, when shown, should
be represented as small circles. To insure clarity
on full size drawings, a circle diameter of not
less than 0.06 inch shall be used. Terminals
should be shown as circles even when physical
appearance differs markedly from the circular
form.
41
PROPOSED USA STANDARD DRAFTING PRACTICES
15-10.3.5.1 Perpendicular Planes
To facilitate showing terminals that are
in a plane perpendicular to the item mounting
surface, the sides of the item containing the
terminals may be revolved into the plane of the
drawing as shown in Figure 10-3.
R
s
A
(A)
o
c
8
(B)
AXIS
°rF_~:~~ON~__
I
i
01
-----J
02-'05~09
!
i
I
010
i
~-----~j~ _~.ti..2!I____ ~
FIGURE 10·3 - REPRESENTATION OF TERMINALS
OCCURRING IN PLANES NOT PARALLEl., TO
THE MOUNTING SURFACE
15-10.3.5.2 Terminal
(C)
FIGURE 10·4 - REPRESENT ATION OF TERMINALS
ON TERMINAL BOARDS OR STRIPS
Boards
or Strips
The terminals of terminal boards or strips
may be represented in one of three ways:
(a) as circles enclosed in a rectangle, as shown
in Figure 10-4(A).
(b) without enclosing rectangles and with the
terminals arranged in an order convenient for
wiring; see Figure 10-4(B).
(c) as subdivided rectangles, where the subdivisions represent terminals; see Figure 10-4(C).
the parts may be simplified, if essential information is not omitted. Notes in combination with a
simplified view may be used when this method
will satisfactorily convey locational requirements and thereby reduce drafting effort.
15-10.3.7 Equipment Device or Part Orientation
15-10.3.6 Arrangement of Component Devices or Parts
Diagrams shall show front views of frontconnected items or rear views of rear-connected
items, or a combination of both to clearly indicate connections. The diagram or sections of
diagram shall be marked to show the appropriate
view and orientation. When orientation cannot be
clearly shown, reference should be made to physical arrangement drawings or to supplementary
notations or designations. For items which cannot be clearly located in relation to the main assembly, additional information should be given to
assure proper connection. When an item is mounted
perpendicular to a panel, the end that is nearest
the panel shall be indicated. For such indication,
see X designation in Figure 10-9 and note for
R2 in Figure 10-10.
The arrangement of symbols in the diagram
shall closely approximate the relative location of
the items as shown on the assembly drawing or
as located on the actual equipment; see Figures
10-1 and 10-2. Within reasonable limits, symbol
placement may differ from the actual arrangement in order to avoid unnecessary crowding of
connecting lines and designations, or to simplify
the layout.
15-10.3.6.1 Critical Location
When part locations are electrically critical to the extent that locations must be specified precisely, a two or three dimensional delineation may be used. This delineation shall show
the relative location of the critically sensitive
parts and wiring with respect to other parts,
wires or areas. For this purpose, the outlines of
15-10.3.8 Designations
Designations for equipments, it~ms, component devices, parts, etc., shown on Connec42
~
'"j,
ELECTRICAL AND ELECTRONICS DIAGRAMS
15-10.3.9 Device or Part Rating, Type,
Range or Scale Indication
Rating, type, range or scale of a device or
part should be indicated as shown in the examples of Figure 10-5. To assure correct identification, the rating of circuit breakers, contactors, instrument transformers, fuses, resistors,
etc., should be located close to the associated
symbol, or shown in tabular form. The type,
rating, range or scale of protective relays, instruments, meters, etc., should be located within
or close to the symbol unless this information is
provided on other drawings or documents to which
reference is made; see also Figure 10-15.
tion Diagrams shall correspond to those shown
on the associated Schematic or Elementary
Diagram.
15-10.3.8.1 Axial Lead and Pigtail Parts
Identification of lead-mounted parts is
preferably indicated by showing the part designation within the part symbol outline; see Figures
10-12, 10-17, and 10-20. For all other parts,
designations may be shown either outside or inside the part symbol depending on preference.
15-10.3.8.2 Terminal or Wire Designations
Terminal and wire riesignations shall
agree with designations assigned on the related
Schematic, Elementary Diagrams or Assembly
Drawings. If these designations have not been
assigned on tne related drawings, then the indication of them on the Connection Diagram shall
agree with markings on the equipmen t.
15-10.3.10 Wire or Cable Size and Type
15-10.3.10.1 Identification
The preferred method of identifying wire
and cable construction is by means of a drawing
note. In such a note, the general rule is to identify the wire size. The type of wire construction
may be specified by code or specification number. Several typical forms of wire identification
covering various wire items are given in the
following examples along with an explanation of
each item of identification.
15-10.3.8.3 Wiring Tie Point Designations
Terminals which are used as wiri;og tie
f10ints or connection points, but which are not
identified on the Schematic Diagram, shall be assigned ccWT" numbers on the Connection Diagram.
For example, WTl, WT2, etc. See Figures 10-20
and 10-24{B).
Direct identification of
size . . . • . . . . 14AWG
No. 14 American Wire
Gage Wire
Direct identification of
size •••. 0640 diameter
(14AWG)
Nominal dia .0640
No. 14 AWG wire
Direct identification of
size and type of insulation . . . . . • 22DNCCB
22AWG wire with
covering of double
nylon, single cotton,
and cotton braid
Identification of size
directly and of insulation by code or specification number .•• L20P
One pair of 20 AWG
wires with covering
per code L or
Specification
Identification of size
and type of insulation
with code letter ..•• B
Wires per B code
covering size
and type
200/5
~~oo
OC
R£l
4-12"
o
o
o
OHM
15-10.3.10.2 Method of Identification on
Diagram
When all or most of the wires on a Connection Diagram are of the same size and type,
wire specification shall be given in a drawing
note, for example:
ALL WIRES SHALL BE 22AWG STRANDED PER
(Spec. No.) UNLESS OTHERWISE SPECIFIED.
Wires which differ from the general specification
covered in the note may be identified directly
on or within the feed line; see Figures 10-10 and
10-17. This may be done also with a leader line
AM
O-I50A
o
o
o
FIGURE 10-5 - DEVICE OR PART RATING, TYPE,
RANGE, SCALE INDICATION
43
PROPOSED USA STANDARD DRAFTING PRACTICES
Figure 10-17, parts designated respectively T2
and R2.
directed to the feed line, see EU designation at
part location 13 in Figure 10-20. In the tabular
type of Connection Diagram, this information
shall be shown in the appropriate column.
15-10.3.14 Phasing Indication
Phasing of alternating current equipment
should be indicated so that there is general
agreement with the actual physical arrangement
and suitable notes shall be used when necessary;
see Figure 10-16. When physical arrangement is
not the governing factor, the phasing should be
indicated in sequence 1, 2, 3, N from left to
right or top to bottom.
15-10.3.10.3 Wire Color or Color Code
Placement
Wire color designations (15-3.11), whether
letters or numbers, shall be placed, in general,
at both ends of a connecting line or as near as
possible to each terminal end. However, a single
appearance of the color designation may be sufficient when the ends of a continuous connecting
line are obvious. When wire color is the only
wire data shown on a connecting or feed line,
the color designation may be shown within the
line; otherwise the data should be shown above
the line.
15-10.3.15 Polarity Indication
Polarity 0 f direct current devices should be
indicated with a P or + for positive, N or - for
negative, and PN or ± for neutral; see Figure
10-15. Direct current busses should be shown in
sequence positive, neutral, negative from left to
right or top to bottom when physical arrangement
is not the governing factor. When it is necessary
to indicate the polarity or orientation of terminals, the feature whereby the polarity or orientation is indicated on the equipment, device or
part shall be noted on the diagram; see CRI and
CR2 in Figures 10-12 and 10-20.
15-10.3.11 Direct or Surface Wiring
The designation "DIR" (direct wiring) or
"SUR" (surface wiring) applies to wiring which
is not part of the cable assembly (wiring harness)
but which is run from terminal to terminal according to the following methods:
(1) DIR - wires run directly from termin~l to
terminal with a minimum of slack.
(2) SUR - wires run from terminal to terminal in
the most convenient manner. When it is necessary to distinguish these wires from wires which
are included in a cable assembly, the designations DIR or SUR should be used to identify
these wires as being apart from cable assembly
wires.
For typical examples of DIR and SUR wire
specifications, see Figure 10-17 and for typical
drawing note, see Figure 10-20, note 3.
CONNECTING
LINES
/J~
~
~
"
/
"
"
)
(
15-10.3.12 Critical Wiring
When circuit functions are so sensitive as
to be affected by wire path, direction, or position,
the wiring involved is regarded as "critical."
Critical conditions may involve not only wire
path but also positioning of pigtail parts which
mount by the leads furnished; see 15-10.3.6.1.
Such critical wiring requirements can frequently
be covered by drawing notes. However, in exceptional cases, a two or three dimensional delineation drawn to scale may be required for a
more precise specification of requirements.
"
CONNECTING
LINES
"~/~HOL£
(A)
(8)
FIGURE 10·6 - METHODS OF SHOWING PASSAGE
OF CONNECTING LINES THROUGH HOLES
15-10.3.16 Holes
Openings, circular or otherwise, in mounting
surfaces through which wires pass shall be indicated with a phantom line and identified as
HOLE 1, HOLE 2, etc.; see Figures 10-17 and
21. When connecting lines representing the wires
are shown passing through the hole, the lines
may be drawn to the edge of the hole or run
across it depending on which method is more
convenient for the type of Connection Diagram
bein$ prepared. The method of Figure 10-6(A)
15-10.3.13 Leads - Pigtail (PGT)
The term "pigtail lead" is used in re ferring
to leads which are furnished with the item and
are permanently connected to it. When it is necessary to distinguish these leads (usually when
colored and of the nonaxial type) from other wiring, the leads shall be designated PGT. When it
is readily apparent that the PGT lead is of the
axial type, the designation may be omitted; see
44
ELECTRICAL AND ELECTRONICS DIAGRAMS
(b) Solid lines shown within the symbol
outline.
(c) Drawing note directed to connecting
line with a leader line indicating that connection
is prewired.
Method (a) or (b) should be supplemented by
a drawing note explaining the line symbols used.
Solid lines outside of the symbol outline shall
always indicate wiring which must be provided.
F or typical application of method (a) see Figure
10-17 and for method (b) see Figure 10-13.
should be used when a hole is shown in separated'
views (principal and auxiliary) on the drawing. In
this method corresponding feed lines should be
identified with wire color or other wire data. The
method of Figure 10-6(B) should be used when a
view is rotated in place as illustrated in Figure
10.20.
15-10.3.17 Additional Cable Stitch Indication
The designations STl, ST2, ST3, etc., are
used to indicate additional cable stitches when
such additions are required. The additional stitch
designation is intended to be used when several
wires of the same color connect to the same item
as shown in Figure 10-7. At installation and during maintenance, connection of these wires is
considerably facilitated if the wires of like color
emerge from the cable body at separate cable
stitches, rather than from a single stitch as
would normally be the case. For a typical application of an additional designation, see yellow wires connecting to electron tube socket
XVI of Figure 10-17. The need for additional
stitches should be avoided, if possible, by the
proper choice of wire color. Loops such as illustrated in Figure 10-7 require only one stitch.
15-10.3.19 Twisted Wire Designations
To indicate that two or more wires are
twisted, letter designations may be used in accordance with the following:
P - Two twisted wires, Pair
T - Three twisted wires, Triple
Q - Four twisted wires, Quad
For typical applications of the symbol for pair,
see Figures 10-10, 10-11 and 10-20.
15-10.3.20 Symbols
USA Standard Y32.2 electrical and electronics
diagram graphic symbols frequently used for wiring on Connection Diagrams are shown in Figure
10-8 for ease of reference.
15-10.3.21 Drawing Notes
Drawing notes should be placed preferably
at the right side of the drawing sheet, as shown
in Figures 10-10, 10-19, and 10-20. In general
the notes may include information on:
(a) wires which are included in or excluded from
the cable assembly
(b) soldering procedures, if any, which need to
be specified
(c) such wiring designations or symbols which
need to be identified or explained
(d) gage and type of wiring
(e) any additional wiring information or instruction.
CABLE STITCHES IN ADDITION
TO REGULAR STITCH (REQUIRED
TO SEPARATE WIRES OF SAME
COLOR THAT WOULD OTHERWISE
EMERGE OUT OF SAME STITCH)
15-10.4 Continuous-Line Type
15-10.4.1 Point-to-Point Diagrams
In point-to-point Connection Diagrams,
separate connecting lines represent the actual
terminal-to-terminal connections which are to be
provided on the equipment; see Figures 10-9 and
10-10. On this type of Connection Diagram, connecting line layout or arrangement is not intended to convey actual or preferred conductor
path location. However, connection sequence
should be determined on the basis of the most
suitable path from terminal to terminal and according to whether wiring harnesses, raceways,
cleats, etc., will be provided. Another determining factor will be whether the path of cable
(harness) is indicated on the Assembly Drawing.
FIGURE 10-7 - VIEW OF TYPICAL CABLE SECTION
SHOWING REGULAR AND SERIES OF
ADDITIONAL STITCHES
15-10.3.18 Prewired Connections
Prewired connections may be indicated by
anyone of the following methods:
(a) Dash lines used for indicating connection from terminal to terminal with no regard
as to whether the lines are shown inside or outside of the symbol outline.
45
PROPOSED USA STANDARD DRAFTING PRACTICES
15-10.4.1.1 Application
The point-to-point method is useful mainly
for the representation of wiring information for
the less complex equipments that may consist of
relatively few items. If use of the point-to-point
method results in a diagram difficult to read because of the number of adjacent and crossing
connecting lines, another of the subsequent
methods in this standard should be considered.
",--INCICATION
OO;T IW~:fL
• .$PL Ie £
~PLICED
CONNECTION
15-10.4.2 Highway or Cable Diagrams
The Highway or Cable Connection Diagram
is basically similar to the Point-to-Point Diagram
with the exception that groups of connecting
lines are merged into lines called highways or
cables in stead of being shown in their entire run
as individual line.s; see Figures 10-11, 10-12,
10-13, 10-15 and 10-16.
CABLE (PREFABRICATED)
15-10.4.2.1 Feed Lines
From the component device or part terminals, short lines which will be referred to as
"feed lines" are drawn perpendicular to the highway or cable line. At the point where the feed
line enters the highway or cable line, direction
of wire run in the highway may be indicated when
necessary with an inclined or curved line; see
Figure 10-11. Crossovers of inclined or curved
portions of feed lines should be avoided by
choice of angle or radius.
SHIELDING FOR WIRE OR CABLE
-t-t-t-F-
CONNECTION TO
~HIELOING
15-10.4.2.2 Wire Data
When wire data is shown on feed lines,
it should include wire destination (item reference designation, wiring path number, or lead
designation) and if required also wire color, code,
or type. This information may be shown adjacent
to or within the feed line; see Figures 10-12 and
10-16. If wire data(color, type, etc.) is not specified on feed lines or in drawing notes, this information shall be shown in a separate wire data
list. This list may appear on the same sheet, or
on a separate sheet of the same drawing or on a
separate drawing.
COAXIAL SHIELD CONNECTION
~
))))
l
))))
15-10.4.2.3 Highway or Cable Lines
In highway layout, unidentified branching points shall be avoided. Either additional
highways or a method of branch identification
such as shown in Figure 10-13 should be used.
More than one highway or cable line may also
be used to facilitate indication of wire runs or to
indicate grouping of particular wires into cable
assemblies (harness); see Figures 10-12 and
10-13.
Another use of a separate highway or
cable line is to indicate which wires have to be
segregated for electrical reasons. A drawing
note with the aid of a symbol, if necessary, shall
identify the highways or cable as being part of
the same or different cable assemblies.
IIII
GROUPING OF CONDUCTORS
FIGURE 10-8 - GRAPHIC SYMBOLS COMMONLY
USED ON CONNECTION DIAGRAMS
46
ELECTRICAL AND ELECTRONICS DIAGRAMS
AM
9
,A
51-2.
S'-~
,5 ~y
I
I
--ro 2J
,,~
<
~
51-1
A
X
I
-- ~r, ,,~ '2.'
2.
3
)
4
......
-
5
"7
8
FIGURE 10·9 - TYPICAL POINT·TO·POINT
CONNECTION DIAGRAM
symbol on the diagram. Connect ion continuity
may be further facilitated by the indication of
wire colors on the feed lines. Wire color indication is particularly helpful when several wires
emerge from a cable arm as a group and connect
to a cluster of terminals on an item.
15-10.4.2.4 Critical and Segregated Wiring
Critical wiring shall not be included in a
cable or highway line, but shall be run separately
in accordance with 15-10.3.12. Wires which must
be segregated for electrical reasons from other
wires but which are not otherwise critical may
also be shown separately or run directly from
term in al to terminal.
F or explanation of nomenclature applicable
to the base-Line or feed-Line methods and for
typical Connection Diagrams prepared according
to these methods, see Figures 10-17, 10-18,
10-19, and 10-20.
15-10.5 Interrupted Line Type
15-10.5.1 Basic-Line or Feed-Line Diagrams
In the base-line and feed-line methods of
preparing Connection Diagrams, connecting lines
start at a symbol and are interrupted a short distance away. In the base-line method these lines
are terminated in a base line for convenience of
alignment, while in the feed-line method, no base
line is used.
Point-to-point continuous lines, if used, are
limited usually to the indication of shortconnection runs between terminals of the same or
adjacent parts or to the indication of axial-lead
part connections. Except for these uses of continuous lines, continuity between the interrupted
lines is conveyed by destination information at
the ends of the feed lines. This destination may
be given as letters or numbers which locate the
15-10.5.1.1 Layout
I n addition to representing relative component device or part locations, space between
symbols shall also be provided for the accommodation of base lines and feed lines.
15-10.5.1.2 Component Device or Part
Locations - Base-Line Method
For the establishment of item locations
in the base-line method, location numbers shall
be assigned in numerically ascending sequence
starting with one, from left to right and top down
or equivalent logical order. When required, location numbers may be assigned on the basis of
major mounting surface divisions, but following
47
PROPOSED USA STANDARD DRAFTING PRACTICES
________________~rE~s~rScrcOv~E~R~______________
HICKEL PLATED
RI
JI
TERM.
G
£3
81(
BK,SUR 67
V,SUR,'7
R
£1
R2
GY
MDUNTING
SURFACE
BR
8R
R
p
AI,
BR
_I-+ _ _~_HING£ LIM_E_______________
(NOr
FURN)
S£ENOT£ 4 - .
.........----+-----+
DI
Tal
69,1()
TI
I 2 J 4
PGT
NOTES:
1.
UNLESS OTHERWISE SPECIFIED, ALL WIRES ARE INCLUDED
IN THE CABlE ASSEMBlY XXXXX.
2.
I TEM NUMBERS REFERRED TO ARE SHOWN I N PARTS LIST OF
ASSEIoIBl Y DRAWING XXXXX.
3.
ALL SOl.OERING SHALL BE IN ACCORDANCE WITH OO-S-52"
METHOD C.
".
SPLI CE AND SOl.DER AND WRAP WITH ONE LAYER OF TAPE
ITEM 59 AND TWO LAYERS OF TAPE ITEM 60.
5.
SUR-WIRING-WIRE TO BE DRESSED BACK AND RUN ALONG
THE MOUNTING SURFACES IN THE MOST CONVENIENT MANNER.
6.
PGT - LEADS FURN I SHEO WITH PART.
FIGURE 10-10 - TYPICAL POINT-TO·POINT CONNECTION DIAGRAM AND NOToES
48
rOBE CONN£CTED
BY CUST()NER
ELECTRICAL AND ELECTRONICS DIAGRAMS
DESTINATION
flWIRE TYPE S¥M90L
TERt.:INAL NO.
REF DESIG OF
NT ]
COMPON7
T8J
.
WIRE COLOR CODE
f:
1r
/
J
I
X
15-10.5.1.4 Location Numbers and Letters
Location numbers and letters should be
made bold and approximately twice the height of
the lettering used in the body of the drawing.
Location numbers and letters should be placed
above the symbol slightly to the left.
When items are shown joined, it may be
more convenient to show location identification
within the symbol outline, generally in upper left
hand corner; see Figure 10-19.
INCLINED LINE INDICATES
RUN DIRECTION
S4
1-1- 8
T8J· 4- C6
/
2
2
0
o
3
o
4
S4-I-C6
T83-/-829
FEED LINE
15-10.5.1.5 Additions
Location numbers and letters may be reserved to allow for future additions. For items
added between two existing consecutively located items, identification may be shown with
dash numbers or some similar distinguishing
method.
(A)
(
T8J
WIRE TYPE
SYMBOL
I
rW1RE COLOY WIRING PATH NO.
8
Rw
C
8L
/
19 10
_
BL
S4
C
2
o
3
o
)(05/
B
CABLE OR
HIGHWAY LINE
FEED LINE
(8)
~.D DESIGN.TION
~---------WI
P2-----------~
m
CJ
WHM
Q
------P2
Ie)
FIGURE 10-11 - METHODS OF INDICATING FEED
LINE WIRE DATA AND DESTINATIONS ON
HIGHWAY OR CABLE CONNECTION DIAGRAMS
the left to right and top down numerical sequence
within each division; see Figures 10-19 and 10-20.
Location numbers are not assigned to items
which can be shown connected on a point-topoint basis and for which feed lines will not be
brought into the base line; for example, see R2
of Figure 10-17 and WT1, WT2, etc., of Figure
10-20.
15-10.5.1.6 Base-Line Representation
Base lines shall be conveniently located
with respect to the symbols. When it is desired
to specifically show that a diagram pertains to a
particular circuit, the base line may be shown
continuous, or it may be broken into segments in
such a manner that continuity is maintained
through linking feed lines. The presentation of
such circuit distinction or unity is illustrated in
Figure 10-20.
When indication of circuit unity on a connection diagram is not a consideration, the base
line may be broken into as many separate base
lines as may be convenient from a drawing layout
standpoint without necessarily linking the base
lines through feed lines.
Location numbers may be shown adjacent
to the base line instead of adjacent to or in the
symbol. Identification of the base line with location numbers may be advantageous when the arrangement of the component device or part arrangement on the equipment does not conform to
a uniform ( mounting plate) or symmetrical pattern. A thick or an extra thick line may be used
for representing the base line when emphasis of
this line is desired.
15-10.5.1.7 Feed-Line Representation
A single feed line may represent more than
one wire to a terminal if clarity is not sacrificed.
When this is done, it is recommended that the
feed line represent wires of the same gage
and type. When the base-line method is used,
feed lines which terminate at the base line from
opposite sides shall not intercept the base line
at the same point, but shall be staggered to avoid
the impression of circuit continuity through the
base line.
15-10.5.1.3 Component Device or Part
Locations - Feed-Line Method
For the establishment of item locations in
the Feed Line method, each item is assigned an
individual arbitrary alphabetical designation.
The letters can be assigned consecutively from
left to right and top to bottom or equivalent logical sequence. Connections are conveyed by means
of a short feed line from item terminals followed
by the item designation and terminal to which it
is connected; see Figure 10-18.
49
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781
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2
R
3
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BK
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12
1.3
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r
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BK
6.....
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HI
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10
51
BR
13
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121
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FIGURE 10·12 - TYPICAL HIGHWAY OR CABLE CONNECTION DIAGRAM
)
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en
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FRONT OF BAY
1,
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PllRT S VIIIRED FROM
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ELECTRICAL AND ELECTRONICS DIAGRAMS
'-3
~
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I
:2
~r--~._z---r-~-~SI_1~~ TT~
S
TP
,
~
TP
,t"
T
Q~
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Q~
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TP
T
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lei ______~"~I~______________~!I~I~________________~I~I
IC.~
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AS
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PZ
Q,
~iJ~-.lL....L....L:,-:"-:"-=--:"-:"-:"~j~I...ullw-I:-\;-:_----'~-r-Lr'-'-T--ri--r-"j-..u.11..IL.11---L1I1-------4[::
,
u
U
= ««
-
~e
i.
t-
C
R
'U
J
n
PI
PZ
P",
,.
TP
G
I
~
"4 )K
o~
Z
4e-4
PI
pz
CS
SS
P~
...2
r:~
PZ
P!.
RELAY AND CONTROL PANEL - REAR VIEW
NOTES:
1. ALL WIRES ARE 14 AWG.
2. CONNECTIONS SHOWN COMPLETELY WITHIN OUTLINES ARE PREWiRED.
FIGURE 10·13 - TYPiCAL HIGHWAY OR CABLE CONNECTION DIAGRAM RELAY AND CONTROL PANEL (SEE ALSO FiGURE 10.14)
51
PROPOSED USA STANDARD DRAFTING PRACTICES
51
AS
VS
POSITIONS
CONTACTS
HANDLE END
'~~l2
1~~l4
I
2
3
3
2
X
X
X
X
X
4
X
~~L6 5
X
6
I
X
POSITIONS
CONTACTS
HANDLE END
'r-4 ~
IC 2C
o--t
2 I
~
o--t.
X
__ 1_-,
X
X
X
3
4
X
X
2
~ 3C 4C'L 4
SEAL-IN
ELEMENT
3-1 2-3 1-2 OFF
X
2
67G
CURRENT
C5
PO~IL-+~_,.,
WHM
POSITIONS
CONTACTS
HANDLE END
IC 2~
I
~~
CLOSE NORM. OPEN
2 I
~
X
X
2
~~~~3
X
4
X
X
8
87X
SS
WM
CONTACTS
HANDLE END
I
IC 2C
a VARM
POSITIONS
ON
2 I
OFF
268
X
o--t~ o-I~
3
~
3C 4C
H
2
X
4 3
X
4
X
0-1 t----o
AUTO TR-FV
FIGURE 10·14 - INTERNAL CONN ECTION DIAGRAMS FOR FIGURE 10·13
52
12
,
)
.~
MV BUSHING
WIRE SHOWN BY
HEAVY L.INES
ARE 6 AWG
COUPLING , - CAPACITOR
DEVICES ON
MECMANISM
HOUSING
I
I
52?~III~IS
TC
14
CC
GRD TERM.
9
O~rfSJ~~~~G
~1--+I-co)o~-f~1--<l I
I 0
10
7
51
52
53
ALL WIRES ARE
AWG UNLESS
OTHERW ISE SPECI~IEO
14
54
555t,
57
58
59
60
VI
Vol
7
t"'4
rr1
n
t-i
~
n
F=
~
0
rr1
t"'4
t'l1
'-5
n
2.5
~
3'MV
rr1
t-i
0
Z
n
en
BUSM,NGS
r-u~
-
0
~
IY4
>
c;')
IY~
~
3vi"
~
m
LnJ
en
3'(3
I
IISK-V PT
""I-V~
I
5
L
3
3Y4
3vS
SVT
Sv2
!;'Y3
~
(+1(-)
5vS
BREAKER MEeHANISM HOUSING - FRONT VIEW
FIGURE 10-15 - TYPICAL HIGHWAY OR CABLE CONNECTI9N DIAGRAM - BREAKER MECHANISM HOUSING
PROPOSED USA STANDARD DRAFTING PRACTICES
,--
FRONT VIEW
REAR VIEW
L3
&
LOW VOLTAGE PANEL
9
LI3
P--l
lO]
TI
L32]
3
:~rr l' t
L31
T2
lO]
:~
T3
I
I
__ L __ ~
----'"\
'='
r9,
AC
POWER
T3T2 TI
PB
START
§
~~~
STOP[~
FIGURE 10·16 - TYPICAL HIGHWAY OR CABLE CONNECTION DIAGRAM
54
I
~
PART
LOCATION
NUMBER
PRE. I RED
ASSEMBLY
\
ELECTRON
TUBE CAP
FOR VI ~
f:-
PIGTAIL
[
mm:~~ON ","-..R4
I
FEED LINE ---..
COLORED
PIGTAIL
WIRE _
r
PART ~
ART
t I ~~
..
~I
r - - - -
PGr
WIRE COLOR ASSOC
WITH DESTINATIONLOCA TI ON NO. 8
I
....
~
:::.
<>:
'?
;;;
DESTINATION-LOCATION
NUfrotBeRS I DENTIFY
PART L.QCATI ONS
TO WH I CH FE£II
II NES ARE
DIRECTED
"'_
~::::::
~
~
'"
~
NOTE 7
~
I
,
9
'<
«
~
\,0
'"
~
'<
'<
Cl)
co
<>:
'"
'"
'"
~
~
\()
~
\(l
~
<>:
::::
'P
)..
SURFACE WIRI NG ----~;;_;;;;rn:;;_::::.::--I--_
ITEM NUMBER -----
~
......
/0
(
~ ~
II
T2
T/
,
2
'\
V')
'"
'"
•
<>:
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It
LETTER SUFFIX
USED .HEN
ADOITtOJfAl
~ ~
FEED LINE
IDENTIFICATION
1S REQU I REO
'"
,...
m
n
6~
Z
n
V>
~
0
;:
Cl
~
P
(/)
12
T3 rl--Tt---Tt-~
o
_
n
s::0
Q)
PA I RED . \RES
PGT
~
~
">
'l:
\
HOLE ' ....... _ ,
V)
'
\r)
,<"
( ;mlD
SYMBOL
i::
">
STI'"""-'ST' STITCH
.......
\
CABLE OR
COR D SYMBOL
'"
'"
......
1 -
BASE
LINE
V)
'<::..:
Q)
(Q
<>: <>:
<>:
"":::'
~
'"
,...
'"
t--.
'\J..Q
\0
'1.0
SECONDARY
CABLE
INDICATION
p
't
<>: '" <>:
\!)
DIRECT .,R,NG
jl/SHIELO
TERMINATION OF
SHIELDED
CONDUCTOR
E2
3
Q)
<>:
.:
PGT
~
_
7
\
-
XOSI
CO
<>:
.).. ~
~
5-1
:
7
/
I
~
"
. , RE COLOR ASSOC
oJ
WITH DESTIJfATIOJf ~
LOCATION NO.' :...._---,,,,
J
R41 ~I
~
:s 6
-
7
I I
I I II "'-J
~
. J
~
ADDED PART
I NOICA T1ON
SLEEVE ITEM NUMBER
KVI
30
WIRES TO T6
SHALL BE RUN
THROUGH HOLE I
BUS (STRAP) ITEM NUMBER
flit
~
~\
R3
NOTE T
BUS
((STRAP)
0
2
FIG URE 10-17 - EXP L ANATION AND APP LI CATION OF BASE- LI NE CONN ECTI ON DI AGRAM
NOM EN CLATURE AND METHOD. USING A POR TI ON OF A TYPICAL DIAGRAM .
( BASICALLY THE SAME FOR FEED -LI NE METHOD, SEE FIGURE 1O - 1B)
TERMINAl
DESIGNATION
PROPOSED USA STANDARD DRAFTING PRACTICES
C
AM
FG,A4~E~
o
D 51-3
,
5
(0
)
l
~w
F 51-'
E 51-2
u
A
5
2;l
CO
FS
2
E5
~u ~
L ____~_~_.~_.____~_r-<l_-_~_"'_~_
I
~
t\J
~
x
~
.. ___
D5
3
C2
4
F2
lJA
UA
UA
7
8
FIGURE 10-18 - TYPICAL FEED·L1NE CONNECTION DIAGRAM
point basis whenever po ssible. Insulated pigtail
wires furnished with the parts shall be designated
C cPGT." Colors of colored pigtail wires shall be
indicated on the feed lines; see Figure 10-17.
15-10.5.1.8 Wire Color Indication
Wire colors, when shown, shall be indicated on each feed line. On a feed line that
represents two or more wires, each of a different
color, the colors shall be indicated in the same
order in which the destination location numbers
appear on the feed line, see Figure 10-17, Rl.
When the wires are mostly of the same color, the
colors shall be covered by a drawing note; see
Note 2, Figure 10-20. In general, the wire color
should be shown approximately midway on feed
lines.
15-10.5.1.9 Wires - Pigtail
Bare pigtail wires furnished with the parts
shall be run directly to terminals on a point-to-
15-10.5.1.10 Letter Suffixes for Wire Identification
When two or more terminals of one part are
to be connected to terminals of another part with
wire of the same color (surface or direct wiring);
a suffix letter shall be added to the feed line
destination number as a means of differentiating
similarly colored wires; see Figures 10-17 and
10-20.
56
TO
ANSWERING
TO
JACK AND MONITOI?
LAMP CKT POSITION
'....
It
::;\~
II)
<=
TBj (
\
r- BUS
!3,ARS
M( 17
~
)..
3 OI40Z403~OI30Z30.33
IS02S< 3S
4
-.I
\!)
'Il
CQ
~
;;;
'<l '<l
~
~
l;
....
I.!\
~
iii
i\J
~.
OI20ZZ03Z(.( I (~
~
II:
~
~
ALL WIRES SHALL BE 24BH UNLESS OTHERWISE SPECIFIED.
'THERWISE
..,,,,,
I
SPECIFIED.
~
1
~
~
\!)
)..
I
3.
E O/6026()3b
~l
Zl
"'I0V
~
24C
IN CA
~24C IN CA
WIRES CONNECTt:D FROM
FPONT OF t:Q(lIPMENT :....., r------<
18 Z8
I.
ON nl5E PANEL,
~I
\.
-.I
CQ
i'4C
IN CA
NOTES:
TO
NIGHT
TO
INC TRK AI.M
( 1<7
CKT
J - TOP OF KEY VIEWED FROM TERMINAL SIDE.
4.
c==:=:> -
5.
OR~R;NgPi~~~~~A ~ :~~~G.
CABLE
PROV I DE IN ACCORDAN CE WITH
LOOSE WIRING
lc
q)
p----< ~
... 10
",
~
...
:::
<\l
-p--"
~
")1<>'"
~~p
11)->-
)..~
Ill';"'"
t:,~: ~ ~~ <>-
51
6
.II
TALK
7
/ 2 3
8
C4
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9
II
10
C2
C3
13
R5
-b
<:)
I.!\
12
R6
CI
co
'"
15
14
R4
R3A
~
:::g bl :i':::.
0(;.3 (:)
~
~
~
~~~
~
...
<Ii
...
Q
1Il
~
'"
'" '" '"
~.
p - ---0
It
Il:
J
5
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l:
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~
~ ~
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'"<1\
o--P_
):
....
II)
oJ\!)
I!I
iii
t\j
CIJ
I\J
~
'It
~
~
~
III
~
16
17
R2
RIA
Z
---0
R.3B
RIB
.3
I
8,30
>-
",tIlC\j
I\J
4
LI
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K6
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3
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21 ~~ ...
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"l01\!
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1'I)01\J0 .... 0
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S2
tJ
tI1
t""'
tTl
n....,
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n
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24
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III
~ ~
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II)
F IGUR E 1O~ 19 - TY P ICAl SA SE LIN E CONN ECTION DI AGRAM
(FOR ASSOCIATED SCHEMATIC, SEE FIGURE 8-17)
~
~
(j)
PROPOSED USA STANDARD DRAFTING PRACTICES
NOTES,
1.
~r-AT
- ,- ---- -
/I
.----------<
P-r"
r- -~HOL[
(--f-
P &. EU
--I-
(S££ NCTE: 6)
l(
~ ~ lD ~
13j,--i-r- -
14
'"
ZI
i
F2 FI
~
G C2 CI
12
EU - 20 AWG STRANDED WIRE PER XXXXX.
4.
------ PREWIRING.
~
5.
AT - WIRES AT TERMINALS I'ITG, 1'lT7, ','lTIO AND WTll TO
BE CONNECTED AS REQUIRED AFTER SHOP TESTS ARE
COMPLETED.
G 0
6.
THESE IV I RES SHALL BE lEFT LONG ENOUGH TO REACH TER-
8
I-.
248
C
24C
o
>::
\.J
240
E:
20A
«
258
H ~
25r
oJ
;;;:
K
f::
ZS/J
ALL WIRING SHALL BE SURFACE WIRING, COlOREO GREEN
UNLESS OTHERWISE SPECIFIED.
3.
F
I
I
I
2.
24A
WTlZ
!
I
L _____ --.l
MINALS WHEfl Zl
(
IS ROTATED 90° CCw WHEN EQUIPMENT IS
TO BE RELAY RACK MOUNTED.
7.
THESE CONNECTING WIRES SHAll 8E SLEEVED WITH APPROXI-
MATELY 12 INCHES OF .05 DIAMETER PLASTIC TUBING.
I
WIRED FROM FRONT
WT9
WT8
ALL WI RES SHALL BE 22 AWG STRANDED PER XXXXX
UNLESS OTHERWISE SPECIFIED.
15
CABLE ASSEMBLY--+-+--+--I-i
16
Lil
1~/7
~,WTI3
XXX)(X
CA8LE
3
AS5EM8LY
4 ,-----
-f-
C26
L6
WTIO
WTII
;
o
f·--f-o-
P-f---+
CI9
R57
WT3
/9
R59
18
52
o
P dt
t--to--t--
E:U
CA8LE
=i:'
~/~
~
'
"
%
rr"'t-+--'-I---"!j------,
-- -(
r~
ASSEMBLY
ARI
0
21
C2 CI DI02
(HIGH)
T4-
(LOW)
R61
84B382BI AI AZ
00
5
XV2
C20
CABLE ASSEMBLY-+--I-+-+--i
6
~
R1
WT5
~.. ~ ~
~
~ ':!?
20
(
WTIS(
,;,
CABLE ASS£MBLY-
,0-------
23
<.II
r----sff:
24
S/A
4- 0
OJ
8
r-r
r-
L7
o
2
I 12
0
o
/I
3
2 0::10 1
25
SI8
o
10
4
27
I 12
2
1/
_ _ _ _,,:,x'--'-V-"'6-f:/;O- CZ)
100
r
90
05
-
~
:
~
~ 1/?rS"I
~,--6'f
o
3
CABLE. ASSE:MBLY
80
~'"
SECTION
NEAREST
MTG SURF,<CE
i--CABLE: ASSE:MBLY
ol\--\-1Ii---_ _+-...J
~:)"
STRAP
ji - NUT
~~
ili
v,
~
'"
28
TJ!-I
P,CABLE
ASS£MBLY
P
'r- -
CA8L£
ASSEMBL'1i1
I
18E
2
180
lc""
I
4
18B
5
leA
6
7
o
8
o
18
P &. E:U
(s£c NOn 7)
IBc
QJ'"
/0
rvt+-T3
1..--- S
fo----t--+--------
I---+O~-I--+""""+--I--------"""CABLC ASSEMBLY
29
PI3
I~
/I
1('
5
02
4
~t-
18
o
17
-015
010 07
141W
~3
30
r-r---
XYI
1
Z
o
'-I-----
-
OIR~
~r-----------------~
FIGURE 10·20 - TYPICAL BASE LINE CONNECTION DIAGRAM
58
ELECTRICAL AND ELECTRONICS DIAGRAMS
·,yIRE DATA
FROM
·'IRE OR ITEM
TYPE IAWG COLOR
LG LOCATION
(A) 330769 18 G-BIC-R 16.3 23 C101-2
(8) 331367 22 G·Y-BIC 26.2 23 C1I8-1
(C) 337821
3.1 23 C1I9-1
18 BARE
350133 16 It
18.2 23 CI?I-2
23 CHASSIS
20 Sl
f~J
(F) 370358
21.0 23 JI02
Sl
(G) 33185
20 BAAE
2.2 23 S101A-7
(H) 1226
23 T101-12
(J) 360111 20 W-A-BL 3i.S 23 T103-5
20 W-r.-Y
Tl03-6
--
-- --- --
J
PATH
TO
REMARKS
LOCATION
NOTES
23 XY103-7
300
-3
HOLE 7, "B" 23 C127-3
FEEDBACK "K"
23 XYI08-2
DIR
2
23 TB103-38 2
VOICE
-3
3,6
23 TB103-39 4,5
7
23 P204
If INPUT
8
-3
I
9,FL
23 S101B-3
DIR
10-1/2"
23 XV101-3
10-1"
23 TBIOI-I
11
UGN OUT
-3
TB101-2
II
NOTES
----
--
--
--
----
--
--
--
--
--
-
WIRING CONDITIONS FOR DATA AS INDICATE••
Al SINGLE WIRE IN CABLEe SINGLE WIRE - SURFACE WIRE
C SINGLE WIRE - DIRECT
D SHIELDED WilE - LEAD
E SHIELDED WilE - SHIELD CONN
!
(F) COAX LEAD TO COAX FITTING
(G) SLEEVED STRAP WITH FULL
LENGTH SLEEVE(H) PART ADDED AT WIRING(J) PAIR
-USUALLY FOUND IN CHASSIS WIRING ONLY
NOTES:
I. WIRES SHALL 8E RUN AND TERMINATED IN ACCORDANCE
WITH SPECIFICATION XXXX UNLESS OTHERWISE
SPECIfiED.
2. TERMINATE IN ACCORDANCE WITH fiG. A OF SPECIFICAT ION YYYY.
~.
SHIELD CONNECTION SHALL BE 2 IN. LONG.
4. SHIELD CONNECTION SHALL 8E
I,
IN. LONG.
5. USE WIRE TERMINAL 2222-31.
6. SOLDER DIRECTLY TO CHASSIS AS CONVENIENT, WITHIN ONE INCH Of SHIELDED CONDUCTOR JUNCTION.
7. TERMINATE PER SPECIFICATIO~ WWWW, FIG. 12
(UG-2731/U) •
8. TERMINATE PER SPECIFICATION .wnw, FI~. j~.
9. USE SLEEVE, SPECifiCATION VVVV, Of SIZE AND
LENGTH SPECifiED (FL INDICATES fULL LENGTH
BETWEEN SOLDERED CONNECTIONS.).
10. USE SLEEVE, SPECifiCATION YVVV, 26 SIZE, OF
LENGTH SPECIFIED.
II. USE '1I1RE TERMINAL ZZZZ-···j.
-
FIGURE 10-21 - COMPREHENSIVE METHOD OF TABULATING WIRING CONDITIONS
15-10.6 Tabular Type
In the tabular method, wlflOg information is
arranged in tabular form (sometimes called a
Running List) rather than shown on feed lines of
a diagram; see Figures 10-21 and 10-25(A). Such
tabular listing of wiring information may be accompanied or supplemented with component device or part locational information shown diagrammatically; see Figure 10-22. However, when locations within an equipment can be readily determined through the application of a coordinate
locational system established for the equipment,
the diagrammatic information may be omitted entirely or reduced substantially.
15-10.6.1 If/iring Information Arrangement
Details of tabular arrangement of information
and number of items covered may vary with individual needs. The following basic information
shall be included as applicable.
(a) FROM-TO Information. The terms "From"
and "To" are used to differentiate between the
ends of a connection. "From-to" information shall
include the identity (location and designation,
terminals, etc.) for each connection point end.
Notes, manufacturing information, etc., may also
be included in the connection point infonnation.
(b) WIRE Information. Wire information shall
identify the wire size and type used for each
59
PROPOSED USA STANDARD DRAFTING PRACTICES
~
.,'
C.ABLE PATH
T82
CI
~
1)
o
LEFT SIDE
VIEWED FROM INSIDE
I
ICllI
~
I
-SEE FIGURE
/
10-22(8)
[3]
TBI
o8TI
o
RE~R
VIEWED FROM INSIDE
.' t,
c~'T81
0
RIGHT SIDE
VIEWED FROM INSIDE
CABLE PATH
FRONT
VIEwED FROM INSIDE
(B) PART ORITENT ATION, TERMINAL ARRANGEMENT,
AND IDENTIFICATION OF ASSEMBLY D
(A) SIMPLIFIED DIAGRAM SHOWING
RELATIVE LOCATIONS IN A MAJOR
EQUIPMENT
FIGURE 10-22 - DIAGRAM SHOWrNG RELATrVE LOCATION OF ITEMS IN AN EQUIPMENT
connection. The portion of such information
which is common to a majority of the connections may be included in a general note; see
15-10.3.10. Wire gage, color or code should be
included in the tabulation when this information
is needed to facilitate connection and maintenance; see Figures 10-21 and 10-25(A).
(c) PATH, ROUTING, VIA Information. Information concerning wire path, raceways, cable
routes, hole locations, etc., should be included
in the tabu lation when such information is not
shown elsewhere and its indication is essential
to the proper wiring of the equipment. As an
alternative to showing path or route information
in the tabulation, it may be shown instead in the
supplementary equipment diagram accompanying
the tabulated information.
(d) NOTES, FUNCTION, or REMARKS. Wire
run requirements such as sleeving data, wire
terminals, special jumpers, and functional lead
designations applicable from one point of connection to the other may be included.
tion of the information and the type of equipment
involved. This application will determine the
sequence selection on the basis of whether the
information is to be used mainly for manufacture,
installation or maintenance or any combination of
these. The type of equipment structure (chassis,
panel, cabinet, bay or frame) and the manner in
which component devices or parts are arranged
are also factors in the sequencing. The type of
equipment will usually determine the method of
item designation (identification) used, it may be
reference, locational or functional. Tabulation
sequence and the listing method used shall be
spec ified on the diagram.
15-10.6.2.1 Listing Methods
Connections between component devices
or parts may be listed in a sequence based on
one or more of the following considerations:
(a) Component device or part location in
or on equipment chassis, panel, bay, frame, etc.
(Conveyance of this location will depend upon
the system of designation used; reference, 10cational, or functional.) A listing sequence of
entries in the table based on a top-down and leftto-right scan of the wiring side of the equipment
is preferred from a wiring performance stand-
15-10.6.2 Tabulation Sequence
The sequence selected for listing entries
in a table should be compatible with the applica-
60
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PANEL A
WIRE
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6
7
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FIGURE 10·23 - TYPICAL CONNECTION DIAGRAM-WITH TABULATION FOR THOSE
CONNECTIONS NOT SHOWN DIAGRAMMATICALL Y
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PROPOSED USA STANDARD DRAFTING PRACTICES
DIAGRAMMATIC FORM
TABULAR FORM
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(C) PIGTAIL PARTS WITH COLORED LEADS (TWO WAY RUNS)
FIGURE 10-24 - PIGTAIL COMPONENT ENTRIES IN A TYPICAL TABULAR LISTING
point. This method results in each wire being
listed twice, once in each direction.
(b) Wiring techniques of the same type,
such as wires in cable harness, direct or surface
wiring, or leads of pigtail parts, etc.
(c) Wire description, such as color, gage,
material, length, etc.
(d) Wires (leads) carrying similar signals,
potentials, etc.
15-10.6.4 Terminalldentification
If items are identified in the table with
reference designations, terminals may be identified with numbers or letters separated from
the designation by a dash or space as shown in
Figures 10-21 and 10-25(A). When the designation is given in terms of its function or location,
it is preferable to provide a separate column for
terminal identification.
15-10.6.3 Placement of Lists
Lists may be shown as follows:
(a) On the same drawing sheet showing a
layout of the equipment as illustrated in Figure
10-23.
(b) On separate sheets as shown in Figure
10-25(A). When the separate sheet practice is
used, the equipment layout information may be
shown on another drawing or the information may
be made part of the tabular list multisheet drawing.
15-10.6.5 Pigtail Parts
Pigtail part information (when listed) shall
be entered in the tabular list as follows:
(a) Surface-Mounted Parts with Colored Pigtails. Colors of color pigtail wires shall be entered in a wire description column; see Figure
10-24(A).
(b) Lead-Mounted (axial lead) Parts wi th
Noncolored Pigtails. The reference designations
of lead-mounted parts, such as R1, C6, or CR3,
shall be entered in a wire description column;
62
ELECTRICAL AND ELECTRONICS DIAGRAMS
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Continued on page 64
(A) TABULAR CONNECTION DIAGRAM (EQUIVALENT TO BASE-LINE
CONNECTION DIAGRAM FIGURE 10-25 (B»
FIGURE 10-25
63
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....
NOTES
PROPOSED USA STANDARD DRAFTING PRACTICES
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Continued from page 63
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DENOTES TERMINATION OF SHIELD
AND IS PREFIXED BY THE DESIG·
NATION OF THE TERMINAL TO WHICH
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MS
DENOTES MECHANICAL STRAP
SS
DENOTES SHIELDED SINGLE
SP
DENOTES SHIELDED PAIR
DENOTES TERMINATION OF A SHIELD
COMMONED WITH A SECOND SHIELD
BY A SINGLE TERMINATION.
ST
DENOTES SHIELDED TRIPLE
•
DENOTES LOWER CASE LETTER
FIGURE 10.25 - COMPARISON OF TABULAR AND PICTORIAL FORMS OF
CONNECTION DIAGRAM FOR THE SAME ASSEMBLY
64
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PROPOSED USA STANDARD DRAFTING PRACTICES
see Figure 10-24(B). The terminals to which the
ends of the part connect shall be listed in the
FROM and TO columns.
circle shall be shown if applicable; in all other
cases the mechanical-grouping boundary line
shall be used to outline the circuit.
Circuits composed of more than one component
part shall have the individual parts identified,
preferably by reference designations. Component
part values shall be indicated and be placed either
adjacent to the part symbols or in a separate
tabulation. Circuits composed of many interconnected component parts are preferably shown by
a Schematic Diagram (see Figures 8-23 and 12-4),
accompanied by an Assembly Drawing showing
the necessary physical relationships and terminal designations.
15-10.6.5.1 Polarity or Orientation of
Axial-Lead Parts
When it is necessary to indicate polarity
or orientation based on marks such as + or - that
appear on the part, an appropriate symbol shall
be used; see Figure 10-24(C). When such symbols are used, an explanatory note shall be included.
15-10.6.6 Supplementary Data
Tabular lists that appear on separate sheets
as multisheet drawings should be supplemented
with equipment layout information showing the
following:
(a) Relative location of all portions of units
that have to be wired within or on the equipment.
If all the portions are not shown in detail in the
layout, reference to drawings containing the detailed information should be indicated.
(b) Terminal arrangement and identification
of unmarked terminals of items. The data should
show a wiring side view of the terminal arrangement. A recommended sequence assignment of
terminal identification is a left-to-right and topto-bottom order.
(c) Special wiring arrangements shown pictorially which cannot be conveyed with tabular
information alone.
(d) Paths of cable harnesses when such
paths are not readily determined. For typical
illustrations showing general equipment layout
information, see Figure 10-22.
15-12.2 Terminal Representation and A"angement
.
The terminals of the items shall be represented
using the applicable graphic symbols located adjacent to the envelope or boundary line and arranged as follows:
(a) The terminals shall be located in the order
they appear when the item is viewed from outside
the terminal face of the device.
(b) If the device terminals are in a circular
arrangement, the actual angular spacing between
the terminals should be approximated on the
Terminal Diagram.
1)·11 Interconnection Diagrams (In Process)
(c) If the terminals are in an essentially
linear arrangement, the Terminal Diagram may
show the terminals in either a linear array along
one side of the elongated envelope symbol (preferable), or within a maximum angle of 150 degrees around the circular envelope symbol.
15-12 Terminal Diagrams
The following subparagraphs contain information specifically applicable to diagrams of
the type often supplied for multi-terminal enclosed or sealed devices, such as electron tubes,
semiconductor devices, packaged circuits and
similar items. For typical Terminal Diagrams,
see Figures 12-1 and 12-4.
The function of a Terminal Diagram may also
be performed by a Pictorial Diagram showing:
(a) the physical relations of the terminals
to the device outline, and
(b) the terminal designations assigned or
marked together with a table or a Schematic Diagram relating the circuit or device parts to the
terminal designations.
15-12.1 Circuit Representation
The circuit of the item depicted shall be
represented using graphic symbols in the usual
mali(ler. An envelope symbol or an enclosing
(d) If terminals are omitted in an otherwise
standard terminal array, the remaining terminals
shall not be respaced.
66
ELECTRICAL AND ELECTRONICS DIAGRAMS
(d) For terminals in an essentially equally
spaced linear array, the terminal positions shall
be numbered progressively beginning with the
terminal nearest the reference mark and counting
any intermediate positions which could provide
space for a terminal; see Figure 12-3.
(e) Terminals in one linear array shall be numbered progressively from the left side, where the
left side is defined as having the most terminals.
This shall be employed only if (d) is not applicable.
(f) If a device has several standard terminal
groups, the terminal identifications may be established independently for each group.
(g) If a terminal configuration has terminals
in concentric circles of decreasing diameters,
the terminal positions on the circles shall be
numbered sequentially continuing from the highest numbered position on the outer circle, alway s numbering in ~ clockwise direction along a
decreasing spiral. The datum line is the reference used for the outer pin circle only.
(h) In the case of devices with terminals
emerging from more than one plane the numbering
shall start on the end:
(1) Opposite to the end containing a threaded
stud or hole.
(2) Opposite to the end with the smallest
number of terminals.
(3) Opposite to the end identified by a
band, dot, or other applied visual identification.
(4) Opposite to the end with the larger
ferrule, flange, insert, etc.
(i) A terminal at the center of the terminal
arrangement shall be identified as the CENTER
terminal lead or pin, and shall not be given a
terminal number.
(j) Whenever polarity of a device is to be
indicated, a polarity symbol + or - should be
used.
o
Connect the terminals to the circuit inside the
outline; see Figures 12-1 through 12-4.
15-12.3 Orientation Features
Symmetrical terminal configurations usually
have an orientation reference in the form of:
(a) a locating guide or mechanical index, a
physical feature to prevent incorrect insertion ,of
the device in its mounting (key, bayonet pm,
terminal omission in symmetrical pattern, etc.), or
(b) a reference mark or visual index positively
located with respect to the terminal group, or
(c) terminal markings.
Orientation symbols shall be indicated at their
proper location on the Terminal Diagram; see
Figures 12-2(E) and 12-3.
15-12.4 Terminal Arrangement Designations
Devices having a base or terminal arrangement
conforming to an established mechanical design
standard shall have the standard designation for
the tenninal arrangement shown adjacent to the
Terminal Diagram; see Figure 12-1. However, on
diagrams intended for other than engineering or
design purposes, mechanical design standard
designations may be omitted.
15-12.5 Terminal Identification
If terminal identifications have been assigned,
they shall be shown on the Terminal Diagram at
the assigned positions.
New terminal configurations should have their
terminal identifications assigned as follows:
(a) Terminals or contact pins should be identified by numbers.
(b) Terminals should be designated in succession, based on the maximum possible number
of terminals. If terminals are omitted, the remaining terminals shall not be renumbered; see
Figure 12-1(B).
(c) For circular configurations, or elsewhere
if applicable, terminal numbering shall begin with
the first terminal, the center of which is past (in
a clockwise direction) the datum line (15-12.5.1)
as viewed from outside the terminal face of the
device. If omission of a terminal in an otherwise
equally spaced array identifies the datum line,
the position of the omitted terminal shall not be
numbered.
15-12.5.1 Terminal Group Datum Lines
The datum line is a radial line used as a
starting point for numbering tenninals in a circularly arranged array.
A datum shall be chosen in the following
order of preference. If two cases apply, the
method appearing first in the list shall be used.
(a) The radial line from the center of the
terminal group through the center of the key, keyway, or index.
(b) The radial line midway between the two
terminals which obviously comprise a gap in an
otherwi se equally spaced circular terminal array.
(c) The radial line midway between:
(1) The two large contact tenninals
(2) The two small contact tenninals
(d) The radial line 1800 from the locating
radius of the most isolated terminals.
67
PROPOSED USA STANDARD DRAFTING PRACTICES
JEDECI2
00-9
RS 209
GRI AND
Cl-2
(A)
(A)
TWO-TERMINAL DEVICE WITH
ONE FLEXIBLE LEAD AND ONE
RIGID TERMINAL CONNECTED
TO METALLIC ENVELOPE
(B)
TWO-TERMINAL DEVICE WITH
RIGID TERMINALS AND REFERENCE
POINT LOCATED AT ONE OF
THE TERMINALS
(C)
THREE-TERMINAL DEVICE WITH
CIRCULAR ARRANGEMENT OF
PIN TERMINALS WITH BASE
ORIENTATION DETERMINED BY
GAP IN PIN SPACING
(D)
THREE-TERMINAL DEVICE WITH
RIGID TERMINALS, ON CONNECTED
TO THE METALLIC ENCLOSURE,
AND INDEX PIN
DEVICE WITH a-TERMINAL
KEYED (SUCH AS OCTAL) BASE,
RIGID ENVELOPE TERMINAL, AND
METALLIC ENVELOPE CONNECTED
TO BASE TERMINAL
RS 209
GRI
(B)
DEVICE WITH KEYED (SUCH
AS OPTICAL) BASE HAVING
DESIGN CAPABILITY OF B
PINS BUT WITH 2 PINS
OMITTED, AND WITH 3
RIGID ENVELOPE TERMINALS
RS209
E9-1
(C)
DEVICE WITH 9-TERMINAL
(SUCH AS NOVAL) BASE
UTILIZING GAP IN PIN
SPACING TO ESTABLISH
BASE ORIENTATION
OR
(E)
FIGURE 12.1 - TYPICAL ELECTRON TUBE
BASING OR TERMINAL DIAGRAMS
A
~
FOUR-TERMINAL DEVICE WITH
IN-LINE PIN TERMINALS, ONE
CONNECTED TO METALLIC ENVELOPE,
AND REFERENCE POINT
FIGURE 12·2 - TYPICAL SEMICONDUCTOR DEVICE
OR TERMINAL DIAGRAMS
68
ELECTRICAL AND ELECTRONICS DIAGRAMS
r
RI
C2
R3
C3
ltI
FIVE-TERMINAL DEVICE WITH IN-LINE
TERMINAL LEADS, ONE CONNECTED
TO METALLIC ENCLOSURE. AND
REFERENCE POINT
R4
I
FIGURE 12-3 - TYPICAL RELAY TERMINAL
DIAGRAM
C4
2
-+_R_--t_ _t--_ --t_
2
4
5
6
CIRCUIT WITH LEAD TERMINALS,
TERMINAL IDENTIFICATION MARKED
ON ITEM, PART VALUES LISTED IN
SEPARATE TABLE
FIGURE 12-4 - TYPICAL PACKAGED
CIRCUIT TERMINAL DIAGRAM
(e) The radial line 180 0 from the locating
radius of the bayonet pin.
(£) The radial line 180 0 from the mid point:
(1) Of the two most cksely spaced terminals.
(2) Of the two most widely spaced
terminals.
(g) The radial line from the center of the
terminal ~roup through the center of the index
terminal. In order of preference the index terminal is defined as:
(1) The terminal having the smaller crosssectional area at the point of emergence
from the case.
(2) The terminal having the greatest
axial length •
•
69
USA Standards of Particular Interest to
Designers, Architects and Draftsmen
TITLE OF STANDARD
USA Standard Drafting Practices
Section 1 Size and Format
YI4.1-1957
Section 2 Line Conventions, Sectioning and Lettering
YI4.2-1957
Section 3 Projections .
YI4.3-1957
Section 4 Pictorial Drawing .
YI4.4-1957
Section 5 Dimensioning and Notes .
YI4.5-1966
Section 6 Screw Threads •
YI4.6-1957
Section 7 Gears, Splines and Serrations .
YI4.7-1958
Section 8 Castings .
· In Preparation
Section 9 Forgings .
YI4.9-1958
Section 10 Metal Stampings
· YI4.10-1959
Section 11 Plastics •
YI4.11-1958
Section 12 Die Castings
• In Preparation
Section 13 Springs, Helical and Flat
· In Preparation
Section 14 Mechanical Assemblies
· YI4.14-1961
Section 15 Electrical and Electronics Diagrams •
· YI4.15-1966
Section 16 Tools, Dies and Gages
· In Preparation
YI4.17-1966
Section 17 Fluid Power Diagrams
Section 18 Drawings for Optical Parts .
• In Preparation
Section 19 Engineering Drawings for Photographic Reproduction
· In Preparation
Graphical Symbols for:
Metallizing Symbols
Y32.12-1960
Welding
Y32.3-1959
Y32.4-1955
Plumbing
Z32.2.3-1949 (Reaffirmed 1953)
Pipe Fittings, Valves and Piping .
Heating, Ventilating and Air Conditioning .
· Z32.2.4-1949
Use on Railroad Maps and Profiles
Y32.7-1957
Z32.2.6-1950 (Reaffirmed 1956)
Heat-Power Apparatus
Y32.10-1958
Fluid Power Diagrams
Y32.11-1961
Process Flow Diagrams in Petroleum and Chemical Industries
Nondestructive Testing Symbols
· Y32.17-1962
Z32.13-1950
Abbreviations for Use on Drawings
Letter Symbols for:
YI0.2-1958
Hydraulics
YIO.14-1959
Rocket Propulsion
ZlO.3-1948
Mechanics for Solid Bodies
ZlO.8-1949
Structural Analysis
YI0.4-1957
Heat and Thermodynamics
ZI0.6-1948
Physics .
YI0.7-1954
Aeronautical Sciences
YI0.9-1953
Radio.
YI0.10-1953
Meteorology .
. YI0.11-1953 (Reaffi;med 1959)
Acoustics
. YI0.12-19SS (Reaffirmed 1961)
Chemical Engineering
YI0.15-1958
Petroleum Reservoir Engineering and Electric Logging.
ZI0.1-1941
Abbreviations for Scientific and Engineering Terms .
Guide for Selecting Greek Letters Used as Letter Symbols
YI0.17-1961
for Engineering Mathematics
YI0.16-1964
She 11 Theory