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ABBREVIATION
DESCRIPTION
1P
One pole
CAT
Catalog
2P
Two pole
CATV
Cable television
3P
Three pole
CB
Circuit breaker
4P
Four pole
CKT
Circuit
1P1W
One pole, one wire
COL
Column
1P2W
One pole, two wires
C.T.
Current transformer
2P2W
Two poles, two wires
CU
Copper
2P3W
Two poles, three wires
Centerline
3P3W
Three poles, three wires
DC
Direct current
3P4W
Three poles, four wires
Delta
4P4W
Four poles, four wires
DISC
Disconnect
Ampere
DWG
Drawing
AC
Alternating current
DT
Dusttight
AF
AMP frame
Wired on emergency circuit
AFF
Above finished floor
EC
Electrical contractor
AFG
Above finished grade
EMT
Electric metallic tubing
AIC
Ampere interrupting capacity
EOL
End of line
AL
Aluminum
EWC
Electric water cooler
AS
AMP switch
EXIST.
Existing
AT
AMP trip
Flush
ARCH
Architect
FA
Fire alarm
ATS
Automatic transfer switch
FBO
Furnished by others
AUD
Audiometer box connection
FC
Fire protection contractor
A/V
Audio visual
FDN
Foundation
BLDG
Building
FLA
Full load amps
Conduit (raceway)
FMC
Flexible metallic conduit
CAM
Camera
FRE
Fiberglass reinforced epoxy conduit
GC
General contractor
MCB
Main circuit breaker
GFCI
Ground fault circuit interrupter
MCC
Motor control center
GFPE
Ground fault protection equipment
MDP
Main distribution panel
GND
Grounded
MISC
Miscellaneous
GRC
Galvanized rigid conduit
MLO
Main lugs only
HP
Horsepower
MOD
Motor operated disconnect switch
HV
High voltage
MTD
Mounted
HVAC
Heating, ventilating, and air conditioning
MTG
Mounting
Hz
Hertz cycle per second
MTS
Manual transfer switch
IAM
Individual addressable module
N/A
Not applicable
IG
Isolated ground
NC
Normally closed
IMC
Intermediate metal conduit
NEC
National Electric Code
JB
Junction box
NIC
Not in contract
KCMIL
Thousand circular mils
NL
Night light
K/O
Knock-out
NM
Nonmetallic sheathed cable
KVA
Kilovolt ampere
Normally open
KVAR
Kilovolt ampere reactive
NRTL
Nationally recognized testing lab
KW
Kilowatt
Number
LFMC
Liquidtight flexible metallic conduit
NTS
Not to scale
LFNC
Liquidtight flexible nonmetallic conduit
LP
Lighting panelboard
LS
Limit switch
LTG
Lighting
LV
Low voltage
MC
Metal clad cable
Pole
SWBD
Switchboard
PB
Pull box
TC
Telephone cabinet
PC
Plumbing system contractor
TCI
Telecommunications cabling installer
PHØ
Phase
TEL/DATA
Telephone/data
PNL
Panel(board)
TEL
Telephone
PIV
Post indicating valve
TERM
Terminal
PP
Power panel
TYP
Typical
PR
Pair
UG
Underground
PRI
Primary
UTP
Unshielded twisted pair
PT
Potential transformer
Volt
PVC
Polyvinyl chloride conduit
VT
Vaportight
PWR
Power
U.O.I.
Unless otherwise indicated
REC
Recessed
Wye
RT
Raintight
Watt
RSC
Rigid steel conduit
WH
Watthour
Surface mounted
WP
Weatherproof
SEC
Secondary
WT
Watertight
SIG
Signal
XFMR
Transformer
SN
Solid neutral
XP
Explosion proof
SP
Spare
ZAM
Zone adapter module
SPL
Splice
+72
Mounting units to centerline above finished floor or grade
SS
Stainless steel
STP
Shielded twisted pair
STL
Carbon steel
SUSP
Suspended
SW
Switch
National Electrical Contractors Association (NECA) Abbreviations
