08/01/2015
.....ELECTRICAL ABBREVIATIONS.....
# Number
Ω Ohm
Φ Phase
A Amperes
AC Alternating Current
A/C Air Conditioning
AFCI Arc Fault Circuit Interrupter
AHU Air Handling Unit
AIC Ampere Interrupting Capacity
AL Aluminum
ATS Automatic Transfer Switch
ATC Automatic Temperature
Control
AWG American Wire Gauge
BTU British Thermal Units
C Conduit
CATV Cable Television or
Community Antennae Television
CB Critical Branch
C/B Circuit Breaker
CBM Certified Ballast Manufacturer
CCT Circuit (also:
CIR, CKT) CCTV Closed Circuit
Television
CD Candela CIR Circuit (also:
CCT, CKT) CKT Circuit (also: CCT, CIR)
CLF Current Limiting Fuse
CPT Control Power Transformer
CT Current Transformer
CU Copper dB Decibel
DC Direct Current
DIA Diameter
EB Equipment Branch
EC Electrical Code or Electrical
Contractor
EF Exhaust Fan
ELEV Elevator
EM Emergency
EMT Electrical Metallic Tubing
EP Emergency Power
EPO Emergency Power Off (Button
or Switch)
EWC Electric Water Cooler
F Fuse
FA Fire Alarm
FAA Fire Alarm Annunciator
FLA Full Load Amperes
FMC Flexible Metal Conduit
G Ground
GFCI, GFI Ground Fault Circuit
Interrupter
GND Ground
GRMC Galvanized Rigid Metal
Conduit
HOA Hand-Off-Automatic Switch
HVAC Heating, Ventilation, Air
Conditioning
HZ Hertz
IEEE Institute of Electrical and
Electronic Engineers
IG Isolated Ground
IMC Intermediate Metal Conduit
INT Interlock
KCMIL Thousand Circular Mils
KVA Kilovolt-Amperes
KVAR Kilovolt-Amperes Reactive
LFMC Liquid Tight Flexible Metal
Conductor
LTG Lighting
LRA Lock Rotor Amps
MC Metal Clad Cable
MCB Main Circuit Breaker
MCC Motor Control Center
MCP Motor Circuit Protection
MI Mineral Insulated
MLO Main Lugs Only MW Megawatt
NC Normally Closed
NEC National Electrical Code
NEMA National Electrical
Manufacturers Association
NFPA National Fire Protection
Association
NL Night Light
NO Normally Open or Number P
Pole
PB Push Button or Panic Button or
Pull Box
PNL Panel PWR Power
PT Potential Transformer
QTY Quantity
REQ Required
RMC Rigid Metal Conduit
RMS Root Mean Squared
RNC Rigid Non-Metallic Conduit
RTS Remote Test Station
RTU Roof Top Unit
SP Spare
ST Shunt Trip
SW Switch
SYM Symmetrical
TEL Telephone
TGB Telecommunications
Grounding Busbar
TMCB Thermal Magnetic Circuit
Breaker
UG Under Ground
UL Underwriters Laboratory
V Volt
VA Volt-Ampere
VT Voltage Transformer
W Watt or Wire
WH Water Heater
WP Weather Proof
XFMR Transformer
