Electric Wiring Symbols
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Transcript of Electric Wiring Symbols
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