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)
Thank for Reading