Typical electrical drawing symbols and conventions. Neca 10020 symbols for electrical construction drawings ansi this publication describes graphic symbols used to represent electrical wiring and equipment on construction drawings. This standard has been prepared as part of the service of isa, the international society of automation. The largest collection of schematic electric and electronic symbols on the internet.
We usually depict the electrical distribution system by a graphic representation called a single line diagram sld. Ansi ieee standard device numbers 1 master element 2 time delay starting or closing relay 3 checking or interlocking relay 4 master contactor 5 stopping device 6 starting circuit breaker 7 rate of change relay 8 control power disconnecting device 9 reversing device 10 unit sequence switch 11 multifunction device. Number 52 represents a circuit breaker according to ansiieee. This action was proposed by the committee on electrical symbols.
In this publication, the term oelectricalo is used to include electrical, electronic, and communications systems covered by the national electrical code nfpa 70. We use universally accepted electrical symbols to represent the different. J american society for engineering education the american society of mechanical engineers diagrams including proposed usa standard for connection diagrams and terminal diagrams the amercan society of mechanical engineers. Benefits built for collaboration intelligent symbols. The largest collection of symbols in the network in pdf format. Graphic symbols for electrical and electronics diagrams. To this end, a designation system that includes symbols and an identification code is presented. Learn to interpret single line diagram sld eep electrical. Documents sold on the ansi webstore are in electronic adobe acrobat pdf format, however some iso and iec standards are available from amazon in hard copy format. Iec symbols electrical, pneumatic and hydraulic symbol library. For consultation and interpretation of components, devices and electrical and electronic circuit. The purpose of this standard is to establish a uniform means of designating instruments and instrumentation systems used for measurement and control.