Iec relay symbols. The distinctive shape set based on traditional schematics is used for simple drawings and derives from mil std 806 of the 1950s and 1960s. This seventh edition of the isoiec directives part 2 cancels and replaces the sixth edition published in 2011. One is given in ansi standard c37 2 and uses a numbering system for various functionsthe functions are supplemented by letters where amplification of the function is required. There are two methods for indicating protection relay functions in common use.
Apart from the circuit symbols each device is also designated a short name. One is given in ansi standard c37 2 and uses a numbering system for various. The isoiec directives part 2 has been prepared by the isoiec joint directives maintenance team jdmt and approved by the iso technical management board isotmb and iec standardization management board iecsmb. There are two methods for indicating protection relay functions in common use.
Electrical symbols electronic symbols. Many converts to autocad electrical are coming from the plain autocad environment so there drawings usually consist of simple lines and text to represent wires and wire numbers and simple blocks to represent schematic symbols. The symbols for different electronic devices are shown below. Click on each link given below to view the symbols.
Converting plain legacy autocad drawings to autocad electrical format. Keep up to date with new publication releases and announcements with our free iec just published email newsletter. Electrical symbols and electronic circuit symbols are used for drawing schematic diagram. There are two sets of symbols for elementary logic gates in common use both defined in ansiieee std 91 1984 and its supplement ansiieee std 91a 1991.