IEC 617-2:1996 Graphical symbols for diagrams -Part 2:Symbol elements, qualifying symbols and other symbols having general application
The scope and the normative references for this series are given in lEC 617-1.
Symbols have been designed in accordance with requirements given in the future lSo 11714-1Themodule size M = 2,5 mm has been used.For better readability smaller symbols in this standard have beenenlarged to double size and are marked "200 %" in the symboi column.To save space larger symbols havebeen reduced to half size and are marked "50 %" in the symbol column. ln accordance with the futureISO 11714-1, clause 7, symbol dimensions (for instance height) may be modified in order to make space fora greater number of terminals or for other layout requirements. In all cases, whether the size is enlarged orreduced, or dimensions modified, the thickness of the original line should be maintained without scaling.
The symbols in this standard are laid out in such a way that the distance between connecting lines is amultipie of a certain module.The module 2M has been chosen to provide enough space for a requiredterminal designation. The symbols have been drawn to a size convenient for comprehension，using thesame grid consistently in the representation of all symbols.
All symbols are designed within a grid in a computer-aided draughting system.The grid which was used hasbeen reproduced in the background of the symbols.
The older symbols which were included in appendix A of the first edition of IEC 617-2 for a transitionalperiod, are no longer part of this second edition, as they will definitely be withdrawn from use.
The indexes in Annex B and C include an alphabetic list of symbol names and their corresponding number.The symbol names are based on the description of the symbols of this part. A general index including analphabetic list of symbols of all parts is given in lEC 617-1.

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