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Extra resources for 315-1975 R1993) IEEE Graphic Symbols for Electrical and Electronic Diagrams Including Reference Designation Letters) Bound with its Supplement 315-1986 R1993

Example text

Identifying values, letters, numbers, or marks shall replace the asterisk. 2 Distribution Lines Transmission Lines Commonly used on system diagrams, maps, and charts. 1 The following letters may be used to indicate type of transmission: F S T V telephony IEC sound (television) IEC telegraphy transmission of data IEC video (television) IEC 45 Copyright © 1975 IEEE All Rights Reserved Copyright The Institute of Electrical and Electronics Engineers, Inc.

2. 1A: The asterisk is not part of the symbol. Always add identification within or adjacent to the rectangle. 19 Copyright © 1975 IEEE All Rights Reserved Copyright The Institute of Electrical and Electronics Engineers, Inc. 3 Application: with adjustable contact. 4 Application: adjustable or continuously adjustable (variable) resistor 20 Copyright The Institute of Electrical and Electronics Engineers, Inc. 9 Instrument or relay shunt Connect instrument or relay to terminals in the rectangle 21 Copyright © 1975 IEEE All Rights Reserved Copyright The Institute of Electrical and Electronics Engineers, Inc.

Elbow), type, impedance, ratings, etc, may be added adjacent to or within any symbol or in a note. 1 Bus bar (with connections shown) Use only if essential to distinguish bus from other circuit paths. 2 Three conductors or conductive paths 39 Copyright © 1975 IEEE All Rights Reserved Copyright The Institute of Electrical and Electronics Engineers, Inc. 3A: The “n” is not part of the symbol. A number representing the actual number of paths shall be substituted for “n”. 4 Dielectric path other than air --``,-`-`,,`,,`,`,,`--- Commonly used for coaxial and waveguide transmission.

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