Electric Wiring SymbolsPanels, Circuits, and Miscellaneous

Lighting panel

Power panel

Branch circuit concealed in ceiling or wall

Branch circuit concealed in floor

Branch circuit exposed--------Home run to panel board with number of circuits indicated by number of arrows

Generator

Motor

Instrument

Power transformer (or draw to scale)

Controler

Isolating switch

 

Electronic symbolFrom Wikipedia, the free encyclopedia

Common circuit diagram symbols (US symbols)

An electronic symbol is a pictogram used to represent various electrical and electronic devices (such

as wires, batteries, resistors, and transistors) in a schematic diagram of an electrical orelectronic circuit.

These symbols can (because of remaining traditions) vary from country to country, but are today to a large

extent internationally standardized. Some symbols (such as those of vacuum tubes) became virtually 

extinct with the development of new technologies.

Contents

 [hide]

1   Standards for symbols

2   Reference designations

3   Gallery of common electronic

symbols

o 3.1   Resistors

o 3.2   Capacitors

o 3.3   Transistors

o 3.4   Diodes

o 3.5   Vacuum tubes

o 3.6   Switches

o 3.7   Miscellaneous

4   See also

5   References

6   External links

[edit]Standards for symbols

There are several national and international standards for graphical symbols in circuit diagrams, in

particular:

IEC  60617 (also known as British Standard BS 3939)

ANSI  standard Y32 (also known as IEEE Std 315)

Australian Standard AS 1102

Different symbols may be used depending on the discipline using the drawing. For example, lighting and

power symbols used as part of architectural drawings may be different from symbols for devices used in

electronics. National and local variations to international standards also exist.

[edit]Reference designations

A reference designator unambiguously identifies a component in an electrical schematic (circuit diagram)

or on a printed circuit board (PCB). The reference designator usually consists of one or two letters followed

by a number, e.g. R13, C1002. The number is sometimes followed by a letter, indicating that components

are grouped or matched with each other, e.g. R17A, R17B. IEEE 315 contains a list of Class Designation

Letters to use for electrical and electronic assemblies. For example, the letter R is a reference prefix for the

resistors of an assembly, C for capacitors, K for relays.

IEEE 200-1975 or "Standard Reference Designations for Electrical and Electronics Parts and Equipments"

is a standard that was used to define referencing naming systems for collections of electronic equipment.

IEEE 200 was ratified in 1975. The IEEE renewed the standard in the 1990s, but withdrew it from active

support shortly thereafter. This standard also has an ANSI document number ANSI Y32.16-1975. They are

the same document.

This standard codified information from, among other sources, a United States military standard MIL-STD-

16 which dates back to at least the 1950s in American industry.

To replace IEEE 200-1975, a standards body for Mechanical Engineers, ASME, initiated the new standard

ASME Y14.44-2008.

This standard along with IEEE 315-1975 provide the electrical designer with guidance on how to properly

reference and annotate everything from a simple circuit board to a complete enclosure all the way to a

collection of these assemblies.

It breaks down a system into units, and then any number of sub-assemblies. The Unit is the highest level of

demarcation in a system and is always a numeral. Subsequent demarcation are called assemblies and

always have the Class Letter "A" as a prefix following by a sequential number starting with 1. Any number

of sub-assemblies may be defined until finally reaching the component.

Especially valuable is the method of referencing and annotating cables plus their connectors within and

outside assemblies. Examples:

1A1A44J5 - Unit 1, Assembly 1, Sub-Assembly 44, Jack 5 (J5 is a connector on a box referenced

as A44)

1A1A45J333 - Unit 1, Assembly 1, Sub-Assembly 45, Jack 333 (J333 is a connector on a box

referenced as A45)

A cable connecting these two might be:

1A1W35 - In the assembly A1 is a cable called W35.

Connectors on this cable would be designated:

1A1W35P1

1A1W35P2

ASME Y14.44-2008 continues the convention of Plug P and Jack J when assigning references for

connectors in electrical assemblies where a J (or jack) is the more fixed and P (or plug) is the less fixed of

a connector pair without regard to the gender of the connector contacts.

The construction of reference designators is covered by IEEE 200-1975/ANSI Y32.16-1975[1] (replaced by

ASME Y14.44-2008[2]) and IEEE-315-1975[3]. The table below lists designators commonly used, and 

does not comply with the standard.

Designator Component Type

AT Attenuator

BR Bridge rectifier

BT Battery

C Capacitor

CN Capacitor network

D Diode (including zeners, thyristors and LEDs)

DL Delay line

DS Display

F Fuse

FB or FEB Ferrite bead

FD Fiducial

J Jack connector (female)

JP Link (Jumper)

K Relay

L Inductor

LS Loudspeaker or buzzer

M Motor

MK Microphone

MP Mechanical part (including screws and fasteners)

P Plug connector (male)

PS Power supply

Q Transistor (all types)

R Resistor

RN Resistor network

RT Thermistor

RV Varistor

S Switch (all types, including push-buttons)

T Transformer

TC Thermocouple

TUN Tuner

TP Test point

U Integrated circuit

V Vacuum Tube

VR Variable Resistor (potentiometer or rheostat)

X Transducer not matching any other category

Y Crystal or oscillator

Z Zener Diode

Component name abbreviations widely used in industry:

AE: aerial, antenna

B: battery

BR: bridge rectifier

C: capacitor

CRT:cathode ray tube

D or CR: diode

DSP:digital signal processor

F: fuse

FET:field effect transistor

GDT: gas discharge tube

IC: integrated circuit

J: wire link ("jumper")

JFET: junction gate field-effect transistor

L: inductor

LCD:Liquid crystal display

LDR: light dependent resistor

LED: light emitting diode

LS: speaker

M: motor

MCB: circuit breaker

Mic: microphone

MOSFET:Metal oxide semiconductor field effect transistor

Ne: neon lamp

OP: Operational Amplifier

PCB: printed circuit board

PU: pickup

Q: transistor

R: resistor

RLA: RY: relay

SCR: silicon controlled rectifier

SW: switch

T: transformer

TFT:thin film transistor(display)

TH: thermistor

TP: test point

Tr: transistor

U: integrated circuit

V: valve (tube)

VC: variable capacitor

VFD: vacuum fluorescent display

VLSI:very large scale integration

VR: variable resistor

X: crystal, ceramic resonator

XMER: transformer

XTAL: crystal

Z or ZD: Zener diode

[edit]Gallery of common electronic symbols

[edit]Resistors

Resistor: American (top) and IEC (bottom)

 

Potentiometer: American

[edit]Capacitors

Capacitor

 

Capacitor, polarized (American)

 

Capacitor, variable

[edit]Transistors

NPN transistor

 

PNP transistor

 

...