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800+ Electrical & Electronic Abbreviations with Full Forms. A-Z

Electrical and Electronics Engineering Abbreviations with Full Forms 

Below is the list of 800+ short form or abbreviation with full form used in electrical and electronic engineering. All the abreavtion are listed from A to Z and Numerical form in Ascending form. You can press “CTRL + F” and write the short form or paste in search box to go to the exact matching abbreviation with full form.

Electrical and Electronic Engineering Abbreviations with Full Forms 

A

  • A                     Amperes, amps.
  • App                  Peak-to-peak amperes
  • AA                   Anti-Aliasing
  • AAAC             All Aluminum Alloy Conductor
  • AAC                All Aluminum Conductor
  • AACSR          Aluminum Alloy Conductor Steel Reinforced
  • AAF                Anti-Aliasing Filter
  • ABC                Aerial Bundled Conductors or Cables
  • AB switch      Air Break switch
  • AC                  Alternating current or voltage
  • A/C                 Air Conditioning
  • ACAR             Aluminum Conductor Alloy Reinforced
  • ACB                Air Circuit Breaker
  • ACCB             Air Case Circuit Breaker
  • ACDB             Alternating Current Distribution Board
  • ACSR             Aluminum Conductor Steel Reinforced
  • ACVS             Air Conditioning & Ventilation System
  • ADC               Analog to Digital Converter
  • AF                   Audio Frequency or Audible Frequency
  • AFC                Automated Frequency Control
  • AFC                Available Fault Current
  • AFCB             Arc Fault Circuit Breaker
  • AFCI               Arc Fault Circuit Interrupter
  • AFL                 Amps Full Load
  • AFT                 Automatic Fine Tuning
  • AGC               Automatic Gain Control
  • AGME            American Gear Manufacturer’s Association
  • AGPS             Assisted (or Aided) GPS
  • AH                  Ampere-Hour Capacity of Batteries.
  • AHU               Air Handling Unit
  • AI                    Analog Input
  • AI                    Artificial Intelligence
  • AIC                 Ampere Interrupting Capacity
  • AL                   Aluminum
  • ALCI               Appliance Leakage Current Interrupter
  • ALTC              Automatic Load Tap Changing
  • ALU                Arithmetic and Logic Unit
  • AMOLED       Active Matrix Organic Light Emitting Diode
  • ANSI               American National Standards Institute.
  • AO                  Analog Output
  • AoA                Angle of Arrival
  • AOI                 Automatic Optical Inspection
  • AP                   Access Point
  • APD                Avalanche Photo Diode
  • APFC             Automatic Power Factor Control
  • API                  American Petroleum Institute, Application Program Interface
  • ARM               Advanced Reduced instruction set computing Machine
  • ARMS             Arc Flash Reduction Maintenance Switch
  • ASCII              American Standard Code for Information Interchange
  • ASIC               Application Specific Integrated Circuit
  • ASK                Amplitude Shift Keying
  • ASME             American Society for Testing and Materials
  • ASP                Application Service Provider
  • ASTA              Association of Short-circuit Testing Authorities.
  • ATS                Automatic Transfer Switch
  • ATC                Automatic Temperature Control
  • ATMega          Microcontroller Cip created by Atmel in the megaAVR family
  • ATMEL           Advanced Technology for Memory and Logic
  • AV                   Audio/video
  • AVO-M            Ampere-Volt-Ohm Meter
  • AVR                Automatic Voltage Regulator
  • AWA               Aluminum Wire Armour
  • AWG               American Wire Gauge

Related Post: 5000+ Electrical and Electronics Engineering Formulas and Equations

B

  • B or b              Electrical Susceptance
  • Bar or bar       Pressure in atmospheres.
  • BASEEFA     British Approvals Service for Electrical Equipment in Flammable Atmospheres
  • BBM               Break before Make
  • BCD               Binary Coded Decimal
  • BCR               Backspace card reader and Barcode reader
  • BER                Bit Error Rate
  • BEV                Billion Electron Volts
  • BGA                Ball Grid Array
  • BIL                  Breakdown insulation level
  • BJT                 Bipolar Junction Transistor
  • BLAC             Brushless AC
  • BLDC             Brushless DC
  • BLDM             Brushless DC Motor
  • BOM               Bill Of Materials
  • BPF                Band Pass Filter
  • bps                  Bit per second
  • Bps                 Byte per second
  • BSI, BS, CP    British Standards Institution, or its publications
  • BTS                Base Transceiver Station
  • BTU                British thermal unit
  • BW                 Bandwidth, (difference between upper and lower limits of a band of frequencies)

C

  • C                     Electrical capacitance, Conduit
  • CA                  Criticality Analysis
  • CAAPS          Circuit Assembly And Processing System
  • CACA             Totally enclosed air circuit, air cooled.
  • CACW            Totally enclosed air circuit, water cooled.
  • CAD               Computer aided design.
  • CAN               Controller area network
  • CATV             Cable Television or Community Antennae Television
  • CB                  Circuit breaker
  • CBCU            Circuit breaker control unit.
  • CBI                 Complementary Binary, referring to a system of codes
  • CBM               Certified Ballast Manufacturer
  • CBR               Constant Bit Rate
  • CC                  Constant Current
  • CCCS             Current Controlled Current Source
  • CCD               Charge-Coupled Device
  • CCR               Central control room
  • CCT                Circuit (also: CIR, CKT)
  • CCTV             Closed Circuit Television
  • CCU               Central control unit
  • CD                  Candela
  • CDMA             Code Division Multiple Access
  • CEGB             Central Electricity Generating Board (UK)
  • CENELEC      European Committee for Electro technical Standardization
  • cont.               Continuous quantity
  • CFL                Compact Fluorescent Light or Compact Fluorescent Lamp
  • CG                  Cable Glands
  • CIR                 Circuit (also: CCT, CKT)
  • CISC              Complex Instruction Set Computer
  • CKT                Circuit (also: CCT, CIR)
  • CLF                Current Limiting Fuse
  • CMOS            Complementary Metal – Oxide Semiconductor
  • CMRR             Common Mode Rejection Ratio
  • CNC               Computer Numeric Control
  • COG               Chip-on-glass
  • COR CU        Corrugated Copper.
  • Cos θ             Power factor.
  • CPLD             Complex Programmable Logic Device
  • CPT                Control Power Transformer
  • CPU               Central Processing Unit
  • CRO               Cathode Ray Oscilloscope
  • CRT                Cathode Ray Tube
  • CSA, csa       Cross-Sectional Area
  • CSI                 Current Source Inverter
  • CSP                Chloro Sulphonated Polyethylene
  • CSS                Computerized Synchronizing System
  • CT                   Current Transformer
  • CU                  Un-tinned Copper
  • CUWB            Copper Wire Braid
  • CVT                Constant Voltage Transformer

D

  • d                     Day.
  • DAC               Digital to Analog Converter
  • db(A)              Measurement unit of sound, Decibels, absolute.
  • dBm               Unit level for power ratio expressed in decibels (dB) with reference to one mill watt (mW)
  • DB                  Distribution Board
  • DC                  Direct Current or Voltage
  • DCDB             Direct Current Distribution Board
  • DCS               Distributed Control System
  • DE                  Drive End of a shaft
  • DEMUX         Demultiplexer, Single input into multiple outputs
  • DFT                Discrete Fourier Transform
  • DIA                 Diameter
  • DIMM              Dual-In-line Memory Module
  • DIN                 Deutsches Institut für Normung means German Institute for Standardization
  • DIP                 Dual-in-Line Package
  • DIPS               Dual-In-Line Sockets
  • DLD                Digital Logic Design
  • DLL                 Delay Locked Loop
  • DMA               Direct Memory Access
  • DMM               Digital Multimeter
  • DMS               Data management system
  • DMT                Definite minimum time
  • DNC               Do Not Connect
  • DO fuse         Drop Out Fuse
  • DOL                Direct-on-line starting of induction motors.
  • DOS               Disk Operating System
  • DP                  Double Pole or Distribution Panel 
  • DPDT             Double Pole, Double Throw
  • DPI                 Dots Per Inch
  • DPIC              Double Pole Iron Clad
  • DPM               Digital panel meter
  • DPR               Dividing Pulse Relay
  • DPST             Double Pole, Single Throw
  • DRAM             Dynamic Random Access Memory
  • DRC               Design Rule Checking
  • DSP                Differential Signal Processing
  • DTMF             Dual Tone Multi-Frequency
  • DTL                 Diode Transistor Logic
  • DTSP             Discrete Time Signal Processing
  • DUT                Device Under Test
  • DVM               Digital Volt Meter
  • DWR              Divided winding rotor synchronous generator.

E

  • E                     Earth or ground
  • EB                   Equipment Branch
  • EBIC               Electron-Beam-Induced Current
  • EC                  Electrical Code or Electrical Contractor or Electronic Commutator
  • ECAD             Electronic Computer-Aided Design
  • ECHA             Equipment certified for hazardous areas.
  • ECL                Emitter coupled logic
  • EEC                European Economic Community
  • EEMVA          Engineering Equipment and Materials Users Association
  • EEPROM       Electrically Erasable Programmable Read-Only Memory
  • EF                   Exhaust Fan
  • EFT                 Electrical fast transient
  • EHT                Extra High Tension
  • EHV                Extra high voltage
  • EIEMA            Electrical Installation Equipment Manufacturer’s Association (UK)
  • ELCB              Earth Leakage Circuit Breaker
  • ELDC             Electric Double-Layer Capacitors (supercap)
  • ELEV              Elevator
  • ELV                Extra low voltage, less than 51 volts
  • EM                  Emergency
  • EMA               Ethylene methyl acrylate
  • EMC               Electromagnetic compatibility
  • EMI                 Electromagnetic interference
  • EMF, e.m.f.    Electromotive force
  • EMLDB          Emergency Lighting Distribution Board
  • EMR               Electro Mechanical Relay
  • EMT                Electrical Metallic Tubing
  • EOCR              Electronic Overcurrent Relay
  • EOS                Electrical Over Stress
  • EP                   Emergency Power
  • EPDM            Ethylene propylene diene monomer
  • EPO                Emergency Power Off (Button or Switch)
  • EPR                Ethylene propylene rubber
  • EPROM         Erasable Programmable Read-Only Memory
  • ERA                Electrical Research Association (UK)
  • ERM               Electronic restart module
  • ESD                Emergency shutdown, Electrostatic discharge
  • ESL                Equivalent Series Inductance
  • ESP                Electric submersible pump
  • ESR                Equivalent Series Resistance
  • EST                Extra Super Tension
  • Ex (), Ex ‘ ’     Certification symbol for hazardous area equipment.
  • EEx (), EEx ‘ ’ Certification symbol for hazardous area equipment, with European harmonisation of standards.
  • EV                   Electron volt, a unit of energy similar to joules
  • EWC               Electric Water Cooler
  • EWS               Engineering work station.

F

  • F, f or Hz        Frequency, Fuse, Farad
  • FA                  Fire Alarm
  • FAA                Fire Alarm Annunciator
  • FAT                 Factory acceptance testing
  • FBA                Factory built assemblies.
  • FBT                 Fly back Transformer
  • FCEV             Fuel Cell Electric Vehicle
  • FCU                Feeder control unit.
  • FDM               Frequency Division Multiplexing
  • FDNR             Frequency Dependent Negative Resistor
  • F and G          Fire and Gas
  • FEED             Front-end engineering and design of a project.
  • FET                Field Effect Transistor
  • FFC                Flexible Flat Cable
  • FFT                 Fast Fourier Transform
  • FIFO               First-In, First-Out (a queue)
  • FILO               First-In, Last-Out (a stack)
  • FLA                 Full Load Amperes
  • Flex                Flexible, used for cables.
  • FM                  Frequency Modulation
  • FMC               Flexible Metal Conduit
  • FPGA             Field-Programmable Gate Array
  • Freq                Frequency
  • FRLS              Fire Resistance Low Smoke
  • FSC                Final Sub Circuit
  • FSM                Finite State Machine
  • FSK                Frequency Shift Keying
  • FVC                Frequency to Voltage Converter

G

  • G or g             Electrical conductance, or ground
  • GBW               Gain Bandwidth Product
  • GCB               Gas circuit breaker.
  • GCP               Generator control panel.
  • GFCI               Ground Fault Circuit Interrupter
  • GFI                  Ground Fault Interrupter
  • GIC                 Generalized Impedance Converter
  • GIS                 Gas insulated switchgear.
  • gm                   Transconductance
  • GND               Ground
  • GO                  Gang Operated
  • GOR               Gas to oil ratio of oil well fluids
  • GOS               Group Operated Switches
  • GPIO              General Purpose Input / Output
  • GPRS             General Packet Radio Service
  • GPS                Global Positioning System
  • GRMC            Galvanized Rigid Metal Conduit
  • GRP               Glass reinforced plastic.
  • GSM               Global System for Mobile Communications
  • GSWA            Galvanized steel wire armour
  • GSWB            Galvanized steel wire braid.
  • GTG or GT     Gas-turbine generator
  • GTO                Gate turn off thyristor
  • GUI                 Graphic User Interface

H

  • h or hr            Hour.
  • HART             Highway Addressable Remote Transducer
  • HBT                Heterojunction bipolar transistor
  • HCL                Hydrogen chloride, gas or acid
  • HDMI              High-Definition Multimedia Interface
  • HED               Hall Effect Device
  • HEMT             High-electron-mobility transistor
  • HF                   High frequency
  • hFE                Large-signal current gain of a BJT
  • HMI                 Human Machine Interface
  • HOA               Hand-Off-Automatic Switch
  • HOFR             Heat and oil resisting, flame retardant.
  • Hp                   Horse power, unit of power in fps system
  • HPF                High Pass Filter
  • HRC               High rupturing capacity
  • HT                   High Tension
  • HTS                High-temperature semiconductor
  • HUI                 Human User Interface
  • HV                  High voltage, above 600 volts
  • HVAC             Heating ventilation and air conditioning
  • Hz                   Frequency in cycles per second, or hertz

I

  • I                       Current in amperes
  • IAC or Iac       Alternating current
  • IALA               International Association of Lighthouse Authorities
  • IC                    Integrated circuit
  • ICDB              Iron Clad Distribution Board
  • ICI                   Imperial Chemical Industries plc (UK)
  • ICSP               In Circuit Serial Programming
  • ICTP               Iron Clad Triple Pole
  • IDC, Idc          Direct current
  • IDMT               Inverse definite minimum time
  • IEC                 International Electrotechnical Commission
  • IEE                  Institution of Electrical Engineers of UK
  • IEEE               Institute of Electronic and Electrical Engineers of USA
  • IF                     Intermediate Frequency
  • IFT                  Inverse Fourier Transform
  • IG                    Isolated Ground
  • IGBT               Insulated-gate Bipolar Transistor
  • IGFET             Insulated Gate Field Effect Transistor
  • I/O                   Input or output signals or quantity
  • IOT                  Internet of Things
  • IMO                 International Maritime Organization
  • IMC                 Intermediate Metal Conduit
  • IMCS              Integrated motor control system
  • IMS                 Information management system
  • inst.                 Instantaneous quantity
  • INT                  Interlock
  • int.                   Intermittent quantity
  • IP                    Institute of Petroleum (UK) and its publications
  • IP                    Ingress protection code, see IEC60529
  • IPMSM           Interior Permanent Magnet Synchronous Motor
  • IR                    Insulation resistance
  • IS                    Intrinsically safe signal, circuit or equipment
  • Is/In, IS/IN      Ratio of starting current to running current
  • ISO                 International Standards Organization
  • ISP                  Internet Service Provider
  • ITU                  International Telecommunication Union

J

  • J                      Energy in joules or newton-meters
  • J                      Current density, amps/mm2
  • JB                   Junction Box
  • JFET               Junction field effect transistor
  • JEDEC           Joint Electron Device Engineering Council

K

  • kA                   Kilo-amperes
  • KCL                Kirchhoff’s Current Law
  • KCMIL            Thousand Circular Mils
  • KEMA             Short circuit testing authority in The Netherlands
  • kg                    Kilogram.
  • km                   Length in kilometers
  • kpm                 Kilometers per hour.
  • kV, Ku            Kilo-volts.
  • kVA                 Kilo-volt-amperes.
  • kVAr               Reactive kilo-volt-amperes.
  • KVL                Kirchhoff’s Voltage Law
  • kW                  Kilowatts.
  • KWH               Kilo Watt Hour

L

  • L                      Electrical inductance in henries
  • L                      Line (Phase, Live or Hot) or local control operation
  • LA                   Lightning Arrester
  • LAN                Local area network
  • lbs                   Weight of a substance in pounds.
  • LCD                Liquid-crystal display
  • LDB                Lighting Distribution Board
  • LDR                Light Dependent Resistor
  • LDS                Low density foam
  • LED                Light emitting diode
  • LEL                 Lower explosive limit
  • LF                   Low frequency
  • LFMC             Liquid Tight Flexible Metal Conduit
  • LHS                Left-hand side
  • Li–ion             Lithium Ion, a type of rechargeable battery
  • Lloyds            Lloyds Register of Shipping (UK)
  • LMS                Load management system
  • LNA                Low noise amplifier
  • LNG                Liquefied natural gas
  • loc or (L)         Local operation
  • LOP                Loss of power
  • LOPT              Line Output Transformer
  • LOS                Loss of signal
  • LPF                 Low Pass Filter
  • LPG                Liquefied petroleum gas
  • LPS                Lightning Protection System
  • LRA                Locked Rotor Amperes
  • LSB                Least Significant Bit
  • LSDS, LSS    Load shedding system
  • LSF                 Low smoke and fumes, applied to cables and wires.
  • LSI                  Large-scale integration
  • LSLH              Low smoke low halogen
  • LSRS, LSR   Load sharing system
  • LT                    Low Tension
  • LTG                 Lighting
  • LV                   Low voltage, 50 to 600 volts
  • LVDT              Linear Variable Differential Transformer
  • L1, L2, L3, N Notation for line and neutral voltages and currents.
  • LUT                 Look Up Table
  • LUX                Level of illumination
  • LVDT              Linear Variable Differential Transformer

M

  • m                     Length or dimension in meters, or month
  • mA                  Current in milli-amperes
  • MAD               Mean Annual Discharge
  • man or (M)     Manual operation
  • mbar               Milli-bar
  • MB                  High-pressure mercury, without phosphor coating
  • MB                  Megabyte, a computer date storage unit
  • MBB               Make-before-break
  • MBF                High-pressure mercury, with phosphor coating
  • MBFR             High-pressure mercury, with phosphor coating and internal reflector
  • MBI                 High-pressure discharge with metallic halides
  • MBIF               High-pressure discharge with metallic halides, with phosphor coating
  • MBR               Double-ended linear arc tube
  • MBTF             Combination of MBF lamp and a filament lamp
  • MC                  Metal Clad Cable
  • MCB               Miniature circuit breaker.
  • MCC               Motor control center
  • MCCB            Moulded case circuit breaker
  • MCM               Multi-Chip Module
  • MCP               Motor Circuit Protection
  • MCR               Maximum continuous rating
  • MCU               Motor control unit
  • MCu               Microcontroller
  • MDB               Main Distribution Board
  • MEC               Micro Energy Cell
  • MEMS            Micro ElectroMechanical Systems
  • MESFET        Metal-Semiconductor Field-Effect-Transistor
  • MESG            Maximum experimental safe gap
  • MF                  Multiplying Factor
  • MFSK             Multiple frequency-shift keying
  • Mho                Unit of electrical admittance
  • MI                    Mineral Insulated
  • MIC                 Minimum ignition current
  • MICC              Mineral insulated calendar cable
  • MIDI                Musical Instrument Digital Interface
  • MIMIC             Mimic display panel
  • MISO              Master Input Slave Output
  • MLDB             Main Lighting Distribution Board
  • MLO                Main Lugs Only
  • mm                 Length or dimension in millimeters
  • MMF, mmf       Magneto-motive force
  • MMI                 Man–machine interface.
  • MMSCF           Million standard cubic feet of a gas
  • Mole %           Molecular weight in %
  • MOSFET        Metal Oxide Semiconductor Field Effect Transistor
  • MOSI              Master Output Slave Input
  • MOV               Metal oxide varistor
  • MPCB             Motor Protection Circuit Breaker
  • MPDB            Main Power Distribution Board
  • MPPT             Maximum Power Point Tracking
  • MPU               Microprocessor
  • MS                  Main Switch
  • MSB               Most Significant Bit
  • MSW              Module steelwork
  • MT                   Mica glass tape
  • MTBF              Mean time between failures
  • MTTR             Mean time to repair
  • MUX               Multiplexer, several analog or digital inputs into single output
  • MV                  Medium voltage
  • mV                  Voltage in millivolts
  • MVA               Mega-volt-amperes
  • MVAr              Reactive mega-volt-amperes
  • MW                 Megawatts

N

  • N or n             Number of items e.g. generators installed
  • N or n             Number of turns in a winding
  • N or n             Neutral terminal or line Neutral
  • NACE             National Association of Corrosion Engineers (USA)
  • NBR               Nitrile butadiene rubber
  • NC, N/C         Normally closed switching device, No Connection
  • NCT                Neutral Current Transformer
  • NDE               Non-drive end of a shaft.
  • NEC               National Electric Code (USA)
  • NEMA            The National Electrical Manufacturer’s Association (USA)
  • NER               Neutral earth resistor.
  • NFPA              National Fire Protection Association (USA)
  • Ni                    Nickel metal
  • NL                   Neutral Link, Night Light
  • NO, N/O         Normally open switching device
  • NOx                Nitrogen based gas emissions.
  • NPR               Noise-power ratio
  • NPT                National pipe threads (USA).
  • NRZ                Non Return to Zero
  • NS                  Used to describe a type of variable speed AC motor
  • NTC                Negative Temperature Coefficient
  • NTS                Not to scale
  • NVM               Non Volatile Memory

O

  • O                    Open, off or stop
  • OC, O/C         Overcurrent or open circuit
  • OCB               Oil circuit breaker
  • OCTC             On-circuit Tap Changer
  • OCV               Open Circuit Voltage, the difference in electrical potential when disconnected from a circuit
  • OF, O/F          Over frequency
  • OFAF              Forced circulation of internal liquid, forced heat exchanging to external air.
  • OFAN             Forced circulation of internal liquid, natural heat exchanging to external air.
  • OHL, OHLine Overhead line
  • Ohms              Unit of electrical resistance or impedance
  • OIM                 Offshore installation manager
  • OL, O/L           Overload
  • OLED             Organic light-emitting diode
  • OLP                OverLoad Protection
  • OLR                OverLoad Relay
  • OLTC              On-load Tap Changer
  • ONAF             Naturally circulated internal liquid, forced heat exchanging to external air
  • ONAN            Naturally circulated internal liquid, natural heat exchanging to external air
  • OpAmp           Operational Amplifier
  • OSC               Oscillator
  • OSHA             Occupational Health and Safety Administration (USA)
  • OTA                Operational Transconductance Amplifier
  • OV, O/V          Overvoltage.
  • OVP                Overvoltage Protector

P

  • P or W            Active power, watts, Pole
  • p, s                  Laplace operator in mathematics, for transfer functions
  • P & ID             Piping and instrument diagram
  • PA                   Public address system
  • PAL                Programmable Array Logic
  • PAM               Pulse or pole amplitude modulation
  • PB                   Push Button or Panic Button or Pull Box
  • PB, Pb            Lead metal
  • PBWB            Phosphor bronze wire braid
  • PBCU, TCU   Tinned copper
  • PC                  Programmable controller, Program counter; used in microcontroller
  • PCB               Printed circuit board
  • PCC               Point of common connection, Power Control Centre
  • PCM               Pulse-code modulation
  • PDA                Personal digital assistant
  • PDB                Power Distribution Board
  • PDM               Pulse density modulation
  • PDP                Power Distribution Panel
  • PEC                PhotoElectric Cell
  • PELV              An extra-low voltage system similar to SELV but connected to earth at some point
  • PF, pf              Power factor
  • PFD                Phase/frequency detector
  • PFM                Pulse Frequency Modulation
  • PGA                Programmable Gain Amplifier
  • Ph, ph            Phases of an electrical circuit
  • PID                 Proportional, Integral, Derivative. A type of controller used in control systems
  • PIR                 Passive Infrared Sensors
  • PIV                  Peak Inverse Voltage
  • pk, peak         Peak value of an instantaneous quantity
  • PLA                Programmable logic array
  • PLC                Programmable logic controller
  • PLCC             Plastic Leaded Chip Carrier
  • PLL                 Phase-Locked Loop
  • PM                  Permanent Magnet
  • PMIC              Power Management Integrated
  • pMOS             P-channel metal-oxide semiconductor
  • PMS               Power management system
  • PMSM            Permanent Magnet Synchronous Motor
  • PNL                Panel
  • POL                Polyethylene, Point-of-load
  • POR               Power-on reset
  • Pot                  Potentiometer
  • POV                Peak Operating Voltage
  • PPM               Pulse Position Modulation, Parts Per Million
  • PRC               Parasitic resistance cancellation
  • PRV                Peak Reverse Voltage
  • PSI                  Pounds per Square Inch
  • PSK                Phase Shift Keying
  • PSR                Power-supply rejection
  • PSRR             Power Supply Rejection Ratio
  • PT                   Potential Transformer
  • PTB                Physilalish Technische Bundesanstalt
  • PTC                Positive Temperature Coefficient
  • PTP                Polyethylene terephthalate
  • PTFE              Poly tetra fluoro ethylene
  • Pu, p.u.          Per unit
  • PUT                Programmable Unijunction Transistor
  • PV                  PhotoVoltaic
  • PVC                Polyvinyl chloride
  • PVDF             Polyvinylidene fluoride
  • PWD               Pulse-width distortion
  • PWM              Pulse width modulation
  • PWR               Power

Q

  • Q                     Reactive power, volt-amperes-reactive, Charge
  • QA                  Quality assurance
  • QAM               Quadrature amplitude modulation
  • QC                  Quality control
  • QFP                Quad Flat Package
  • QTY                Quantity

R

  • R or r              Electrical resistance
  • Rad, rad         Angular displacement in radians
  • RADAR          Radio Detection and Ranging
  • RAM               Random access memory
  • RCBO             Residual Current Circuit Breaker with Overload Protection
  • RCCB            means Residual Current Circuit Breaker
  • RCD               Residual current device
  • RCU               Remote control unit
  • RDOL             Reverse Duty On Line Starter
  • Ref.                 Reference
  • rem or (R)      Remote operation
  • REQ               Required
  • RF                   Radio Frequency, describing the rate of oscillation
  • RFDS             Radio frequency design system
  • RFID               Radio Frequency Identification
  • RGB               Red Green Blue
  • RGS               Rigid Galvanized Steel Conduit
  • RHS               Right-hand side
  • RIO                 Remote Input Output
  • RISC              Reduced Instruction Set Computer
  • RJ45               Registered Jack 45. An 8 pin Ethernet Jack
  • RLA                Rated Load Amperes
  • RLC                Resistance Inductance Capacitance
  • RMC               Rigid Metal Conduit
  • RMG               Ring Main Gear
  • RMS, rms       Root mean square
  • RMU               Ring main unit
  • RNC               Rigid Non-Metallic Conduit
  • ROM               Read only memory
  • RPR               Reverse Power Relay
  • RPS                Revolutions per Second
  • RPM               Revolutions per Minute
  • RSC               Rigid Steel Conduit
  • RTC                Real-time clock
  • RTD                Resistance temperature detector
  • RTOS             Real Time Operating System
  • RTS                Remote Test Station
  • RTU                Remote transmitter unit, Roof Top Unit
  • Rx                   Receiver
  • RYB                Red, Yellow, Blue (Old Color Codes used for three phase Wiring – UK)

S

  • S                     Apparent power in volt-amperes
  • s or p              Laplace operator in mathematics, for transfer functions
  • S                     Slip of a rotating machine with respect to 1.0 pu
  • SAW               Surface Acoustic Wave
  • SB                   Switch Board
  • SBM               Single buoy mooring
  • SC, S/C          Short circuit
  • SCADA          Supervisory control and data acquisition system
  • SCF                Standard cubic feet of a gas
  • SCIM              Squirrel Cage Induction Motor
  • SCK                Serial Clock
  • SCR               Silicon Controlled Rectifier
  • SCS                Silicon Controller Switch
  • SCSI               Small Computer System Interface
  • SDR               Single discipline review
  • SEB                Service End Line Box or Service Electrical Box
  • SECT              Skin effect current trace heating
  • SELV              Safety extra-low voltage
  • SFU                Switch Fuse Unit
  • SF6                 Sulphur hexafluoride
  • SI                    System International of Unit’s
  • SIM                 Subscriber identity module
  • SIO                 Serial Input and (serial) Output
  • SIPO               Serial In Parallel Out
  • SLDB             Secondary Lighting Distribution Board
  • SLI                  Double-ended, linear arc tube
  • SMD               Surface Mount Device
  • SMPS             Switch-mode power supply
  • SMSB             Sub Main Switchboard
  • SMT                Surface mount technologies
  • SNR               Signal-to-Noise Ratio
  • SoC                System on a Chip
  • SOIC              Small Outline Integrated Circuit
  • SOLAS           Safety of life at sea, a document relating to marine practice
  • SON               Diffused ellipsoidal outer bulb, single-ended lamp
  • SONAR          SOund NAvigation and Ranging
  • SON-T            Clear tubular outer bulb, single-ended lamp
  • SON-TD,L Clear tubular outer bulb, double-ended lamp
  • SON-R           SON lamp, with internal reflector
  • SOL CU         Solid copper
  • SOP                Small Outline Package
  • SOT                Small outline transistor
  • SOX                U-shaped arc tube, single-ended lamp
  • Sox                 Sulphur based gas emissions
  • SP                   Single phase
  • SPDT             Single Pole Double Throw
  • SPI                  Serial Peripheral Interface
  • SPICE            Simulation Program with Integrated Circuit Emphasis
  • SPMSM         Surface Permanent magnet Synchronous Motor
  • SPST              Single Pole Single Throw
  • SPT                Stranded Parallel Thermoplastic
  • sq                    Square, e.g. sq mm is square millimeters
  • SR                  Shift Register, Slew Rate
  • SRAM             Static Random Access Memory
  • SRF                Self-resonant frequency
  • SRIM              Slip Ring Induction Motor
  • SRM               Switched Reluctance Motor
  • SSB                Single SideBand
  • SSI                  Small Scale Integration
  • SSR                Solid State Relay, Synchronization check protection relay
  • ST                   Super Tension, Shunt Trip
  • STA                Steel Tape Armoure
  • STG                Steam turbine generator
  • STP                Shielded Twisted Pair
  • STR                Statimax Trip Release
  • STR CU         Stranded copper
  • SW                  Switch, Shortwave, as in the case with shortwave bands
  • SWA               Steel wire armour
  • SWBD            Switchboard
  • SWG               Standard Wire Gauge
  • SWGR            Switchgear
  • SYNC, Sync  Synchronizing
  • SYM               Symmetrical
  • SyRM             Synchronous Reluctance Motor

T

  • T or t               Time, usually in seconds
  • TB                   Terminal Block
  • Td                    Time constant in seconds for the quantity ‘d’
  • TC                  Temperature Coefficient
  • TCP/IP           Transmission Control Protocol/Internet Protocol
  • TDRM             Time delayed restart relay
  • TEFC              Totally enclosed fan cooled
  • TEL                 Telephone
  • TEM                Transverse Electromagnetic (wave)        
  • temp.              Temperature
  • TESFC           Totally enclosed separate fan cooled, fan attached to an auxiliary motor Shaft
  • TF                   Transfer Function
  • T/F                  Transformer
  • TFD                Thin Film Detector
  • TFT                 Thin Film Transistor
  • TG                   Turbo-generator, gas or steam
  • TGB                Telecommunications Grounding Bus bar
  • THD                Total Harmonic Distortion
  • THF                Telephone harmonic factor
  • TOP                Gas-turbine operating temperature (hot-end blade temperature)
  • TM                   Technical measurement system of units
  • TMCB             Thermal Magnetic Circuit Breaker
  • TCP                Gas-turbine control panel
  • TLX                 Cold starting tubular fluorescent lamp, with single-pin caps
  • TPDT              Triple Pole Double Throw
  • TPIC               Triple Pole Iron Clad
  • TPN                Three-phase and neutral power supply
  • TPPL              Total plant peak load
  • TPRL              Total plant running load
  • TPS                Triple Pole Switch
  • TPST              Triple Pole Single Throw
  • Tran., Tx         Transformer
  • TRS                Tough Rubber Sheathed
  • TTL                 Transistor-Transistor Logic
  • TVS-Diode    Transient Voltage Suppression Diode
  • Tx                    Transmitter

U

  • U                     Voltage, also used for energy
  • UART             Universal Asynchronous Receiver and Transmitter
  • UC, U/C         Undercurrent
  • UCP               Unit control panel
  • UDS               Uniform Drawing System
  • UEL                Upper explosive limit
  • UF, U/F          Under frequency
  • UG                  Under Ground
  • UHF                Ultra high frequency
  • UI, U/I             Undercurrent
  • UJT                 Unijunction Transistor
  • UL, U/L           Under load
  • UL                   Underwriters Laboratory (USA)
  • UVLO             Under voltage lockout
  • UNO               Unless noted otherwise
  • UPS                Uninterruptible power supply unit
  • USART           Universal Synchronous and Asynchronous Receiver and Transmitter
  • USB                Universal Serial Bus
  • UTP                Unshielded Twisted Pair
  • UV, U/V          Under voltage

V

  • V, U                Voltage or volts
  • VA                   Volt-amperes
  • VAC, Vac       Alternating voltage
  • VAr, Var         Reactive volt-amperes
  • VCA                Voltage Controlled Amplifier
  • VCB                Vacuum Circuit Breaker
  • VCC               Voltage at the common collector
  • VCCS             Voltage Controlled Current Source
  • VCD               Variable Capacitance Diode
  • VCO               Voltage Controlled Oscillator
  • VCXO             Voltage-Controlled Crystal Oscillator
  • VDC, Vdc      Direct voltage
  • VDE                Verband Deutscher Electrechniker (Germany).
  • VDI                 Verein Deutscher Ingenieure (Germany).
  • VDU               Visual display unit
  • VFD                Variable Frequency Drive, Vacuum Fluorescent Display
  • VFDP             Variable Frequency Drive Panel
  • VFO                Variable-frequency oscillator
  • VGA                Video Graphics Adapter
  • VHF                Very high frequency
  • VIR                 Vulcanized Indian Rubber
  • VLSI               Very Large Scale Integration
  • VOM               Volt Ohm Meter, a device also known as a millimeter or multitester
  • VSD, VSDS  Variable speed drive systems
  • VSI                  Voltage source inverter
  • VSWR            Voltage Standing Wave Ratio
  • V.T., VT          Voltage transformer
  • v/v                   Comparison by volume, per-unit
  • VVVF               Variable Voltage Variable Frequency Drive

W

  • W or P            Active power, watts
  • w or ω            Frequency in radians per second.
  • wdg.                Winding of a machine or transformer
  • WH                 Water Heater
  • WHRU           Waste heat recovery unit
  • WLAN            Wireless Local Area Network
  • WP                  Weather Proof
  • WRIM             Wound Rotor Induction Motor
  • WRSM           Wound Rotor Synchronous Motor
  • WSN               Wireless Sensor Network

X

  • X                     Electrical reactance
  • XFMR             Transformer
  • XLPA              Cross-linked polyalkene
  • XLPE              Cross-linked polyethylene
  • XO                  Crystal Oscillator

Y

  • Y                     Electrical admittance (Also used for Star Connection)
  • y                      Year

Z

  • Z                      Electrical impedance
  • ZH                   Zero halogen, as used for cables
  • ZVC                Zero voltage crossing
  • ZVS                Zero voltage switching

Numerical

  • 1P, SP            Single phase
  • 3P                   Three-phase supply
  • 3P-N               Three-phase and neutral supply
  • 3P-N-E           Three-phase neutral and earth supply
  • 2W                  Two-wire supply
  • 3W                  Three-wire supply
  • 4W                  Four-wire supply
  • 3G                   Third Generation
  • 3R3                 3.3 ohm Resistor
  • 4K                   4,000 pixels
  • 4P4T               Quad-Pole Quad-Throw
  • 4WJ                Four-Way Junction

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One Comment

  1. Chukwumuanya says:

    Your technology is needed for the real time Technological Research & Development
    Thanks.

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