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kg
kilogram
2
kg/cm
kilograms per square
centimeter
kgm
kilogram-meter
3
kg/m
kilograms per cubic meter
kHz
kilohertz
kJ
kilojoule
km
kilometer
kOhm, kW kilo-ohm
kPa
kilopascal
kph
kilometers per hour
kV
kilovolt
kVA
kilovolt ampere
kVAR
kilovolt ampere reactive
kW
kilowatt
kWh
kilowatt-hour
kWm
kilowatt mechanical
L
liter
LAN
local area network
L x W x H length by width by height
lb.
pound, pounds
3
lbm/ft
pounds mass per cubic feet
LCB
line circuit breaker
LCD
liquid crystal display
ld. shd.
load shed
LED
light emitting diode
Lph
liters per hour
Lpm
liters per minute
LOP
low oil pressure
LP
liquefied petroleum
LPG
liquefied petroleum gas
LS
left side
L
sound power level, A weighted
wa
LWL
low water level
LWT
low water temperature
m
meter, milli (1/1000)
6
M
mega (10
when used with SI
units), male
3
m
cubic meter
3
m
/min.
cubic meters per minute
mA
milliampere
man.
manual
max.
maximum
20
MB
megabyte (2
bytes)
MCM
one thousand circular mils
MCCB
molded-case circuit breaker
meggar
megohmmeter
MHz
megahertz
mi.
mile
mil
one one-thousandth of an inch
min.
minimum, minute
misc.
miscellaneous
MJ
megajoule
mJ
millijoule
mm
millimeter
mOhm, mW
milliohm
MOhm, MW
megohm
MOV
metal oxide varistor
MPa
megapascal
mpg
miles per gallon
mph
miles per hour
MS
military standard
m/sec.
meters per second
MTBF
mean time between failure
MTBO
mean time between overhauls
mtg.
mounting
A-2 Appendix
MW
megawatt
mW
milliwatt
mF
microfarad
N, norm.
normal (power source)
NA
not available, not applicable
nat. gas
natural gas
NBS
National Bureau of Standards
NC
normally closed
NEC
National Electrical Code
NEMA
National Electrical
Manufacturers Association
NFPA
National Fire Protection
Association
Nm
newton meter
NO
normally open
no., nos.
number, numbers
NPS
National Pipe, Straight
NPSC
National Pipe, Straight-coupling
NPT
National Standard taper pipe
thread per general use
NPTF
National Pipe, Taper-Fine
NR
not required, normal relay
ns
nanosecond
OC
overcrank
OD
outside diameter
OEM
original equipment
manufacturer
OF
overfrequency
opt.
option, optional
OS
oversize, overspeed
OSHA
Occupational Safety and Health
Administration
OV
overvoltage
oz.
ounce
p., pp.
page, pages
PC
personal computer
PCB
printed circuit board
pF
picofarad
PF
power factor
Æ
ph.,
phase
PHC
Phillips head crimptite (screw)
PHH
Phillips hex head (screw)
PHM
pan head machine (screw)
PLC
programmable logic control
PMG
permanent-magnet generator
pot
potentiometer, potential
ppm
parts per million
PROM
programmable read-only
memory
psi
pounds per square inch
pt.
pint
PTC
positive temperature coefficient
PTO
power takeoff
PVC
polyvinyl chloride
qt.
quart
qty.
quantity
R
replacement (emergency)
power source
rad.
radiator, radius
RAM
random access memory
RDO
relay driver output
ref.
reference
rem.
remote
RFI
radio frequency interference
RH
round head
RHM
round head machine (screw)
rly.
relay
rms
root mean square
rnd.
round
ROM
read only memory
rot.
rotate, rotating
rpm
revolutions per minute
RS
right side
RTV
room temperature vulcanization
SAE
Society of Automotive
Engineers
scfm
standard cubic feet per minute
SCR
silicon controlled rectifier
s, sec.
second
SI
Systeme international d'unites,
International System of Units
SI/EO
side in/end out
sil.
silencer
SN
serial number
SPDT
single--pole, double--throw
SPST
single--pole, single--throw
spec, specs
specification(s)
sq.
square
sq. cm
square centimeter
sq. in.
square inch
SS
stainless steel
std.
standard
stl.
steel
tach.
tachometer
TD
time delay
TDC
top dead center
TDEC
time delay engine cooldown
TDEN
time delay emergency to
normal
TDES
time delay engine start
TDNE
time delay normal to
emergency
TDOE
time delay off to emergency
TDON
time delay off to normal
temp.
temperature
term.
terminal
TIF
telephone influence factor
TIR
total indicator reading
tol.
tolerance
turbo.
turbocharger
typ.
typical (same in multiple
locations)
UF
underfrequency
UHF
ultrahigh frequency
UL
Underwriter's Laboratories, Inc.
UNC
unified coarse thread (was NC)
UNF
unified fine thread (was NF)
univ.
universal
US
undersize, underspeed
UV
ultraviolet, undervoltage
V
volt
VAC
volts alternating current
VAR
voltampere reactive
VDC
volts direct current
VFD
vacuum fluorescent display
VGA
video graphics adapter
VHF
very high frequency
W
watt
WCR
withstand and closing rating
w/
with
w/o
without
wt.
weight
xfmr
transformer
TP-5985 10/02