Electrical Abbreviations And Full Forms

Electrical Basic Abbreviations and Full Forms Sl.No.

Abbreviation

Explanation

1

HT

High Tension (Transformer HT side)

2

LT

Low Tension

3

AB switch

Air Break switch

4

DO fuse

Drop Out fuse

5

ACB

Air Circuit Breaker

6

VCB

Vacuum Circuit Breaker

7

SF6 Circuit Breaker

Sulphur Hexafluoride Circuit Breaker

8

ACDB

Alternating Current Distribution Board

9

DCDB

Direct Current Distribution Board

10

PDB

Power Distribution Board

11

MPDB

Main Power Distribution Board

12

PCC

Power Control Centre

13

MCC

Motor Control Centre

14

MCP

Motor Control Panel

15

VVVF

Variable Voltage Variable Frequency Drive

16

VSD

Variable Speed Drive

17

DOL

Direct On Line

18

RDOL

Reverse Duty On Line

19

MLDB

Main Lighting Distribution Board

20

SLDB

Secondary Lighting Distribution Board

21

EMLDB

Emergency Lighting Distribution Board

22

CPSS

Construction Power Substation

23

DSS

Distribution Power Substation

24

RCC

Remote Control Cables

25

MCB

Miniature Circuit Breaker

26

MCCB

Moulded Case Circuit Breaker

27

MPCB

Motor Protection Circuit Breaker

28

EMPR

Electronic Motor Protection Relay

29

RCCB

Residual Current Circuit Breaker

30

RCBO

Residual Current Circuit Breaker with Over-current Protection

31

ELCB

Earth Leakage Circuit Breaker

32

HRC fuse

High Rupture Capacity fuse

33

OLTC

On Load Tap Changer

34

FCMA

Flux Compensated Magnetic Amplifier

35

UPS

Un-interrupted Power Supply

36

SMF Battery

Sealed Maintenance Free Battery

37

JB

Junction Box

38

PB

Push Button

39

TB

Terminal Box

40

LCB

Local Control Board

41

LCS

Local Control Station

42

SPNDB

Short circuit Protection Neutral Distribution Board

43

TPNDB

Three Phase and Neutral Distribution Board

44

CT

Current Transformer

45

PT

Potential Transformer

46

SCIM

Squirrel Cage Induction Motor

47

ACVS

Air Conditioning and Ventilation System

48

FDA

Fire Detection and Alarm

49

PCS

Pull Cord Switch

50

ZSS

Zero Speed Switch

51

BSS

Belt Sway Switch

52

NO

Normally Opened

53

NC

Normally Closed

54

TEFC

Total Enclosed Fan Cooled

55

TESC

Totally Enclosed Surface Cooled

56

ISMC

Indian Standard Medium weight Channel

57

GI busbar

Galvanized Iron bus bar (for Earthing)

Automation and Instrumentation Sl.No.

Abbreviation

Explanation

1

PLC

Programmable Logic Controller

2

DCS

Distributed Control System

3

MPI

Multi Point Interface

4

DP

Distributed Peripheral

5

SCADA

Supervisory Control And Data Acquisition

6

HART

Highway Addressable Remote Transducer

7

HMI

Human Machine Interface

8

MMI

Man Machine Interface

9

VDU

Visual Display Unit

10

RIO

Remote Input Output

11

TCP/IP

Transmission Control Protocol-Internet Protocol

12

CFC

Continuous Function Chart

13

SFC

Sequential Function Chart

14

PID control

Proportional Integral and Derivative control

15

RAM

Random Access Memory

16

ROM

Read Only Memory

17

PROM

Programmable Read Only Memory

18

EPROM

Erasable Programmable Read Only Memory

19

EEPROM

Electrically Erasable Programmable Read Only Memory

20

RTD

Resistance Temperature Device

Standards Sl.No.

Abbreviation

Explanation

1

IEC

International Electrotechnical Commission

2

EN

European Norms

3

CENELEC

European Committee for Electrotechnical Standardization

4

VDE

Verband Deutscher Elektrotechniker

5

BS

British Standards

6

ISA

International Standards Association

7

ISO

International Standards Organization

8

NEMA

National Electrical Manufacturers Association

9

BIS

Bureau of Indian Standards

10

IEEE

Institute of Electrical and Electronics Engineers

11

ISI

Indian Standards Institute

12

ANSI

American National Standards Institute

13

IP

Ingress Protection

14

ISMC

International Society of Motor Control