/ - And/or
+/- - Plus or Minus
≤ - Equal to or less than
# - Number
°C - Degree Celsius
°F - Degree Fahrenheit
Ø - Phase angle
Ω - Ohm, unit of resistance
® - Trademark
AC or ac - Alternating current, also implies root-mean-square (RMS)
Ambient Temp - Temperature of surrounding air
Ambient noise - Acoustical noise of surrounding environment
ANSI - American National Standard Institute
AWG - American Wire Gauge A standard unit for measuring wire cross-sectional area
BTU or Btu - British thermal unit Defined as the amount of heat required to raise the temperature of one pound of water by 1°F
BYPASS mode - Load is powered by the bypass input line through the static switch
CB - Circuit breaker
DC or dc - Direct current, or voltage
Earth ground - A ground circuit that has contact with the earth
GND - Electrical ground
Hz - Hertz, frequency measurement unit, 1Hz is one cycle per second
I - Current
In - Nominal current
IEC - International Electrotechnical Commission
IEEE - Institute of Electrical and Electronic Engineers
Inverter - An electrical circuit that generates an AC voltage source from a DC voltage source
IGBT - Insulated gate bipolar transistors
I/O - Input/Output
KVA - KiloVolt-Ampere; is equal to 1000 Volt-Ampere
KW - True power. Kilo-Watt = 1000 Watt
L - Line
LCD - Liquid-Crystal Display
LED - Light Emitting Diode
Mains or Mains 1 - Main AC input source.
Mains 2 - Bypass AC input source
mA - Milliampere
MAX - Maximum
N - Neutral
NC - Normally closed.
NO - Normally open
NEC - National Electrical Code
NFPA - National Fire Protection Association
PN - Part number
Pn - Nominal power
On-line mode - Inverter output power is the primary energy source to load
OSHA - Occupational Safety and Health Agency
PCA - Printed circuit assembly
PCB - Printed circuit board
PFC - Power Factor Corrected
PWM - Pulse Width Modulation
Q1 - UPS input isolation switch
Q3BP - UPS maintenance bypass switch
Q4S - UPS bypass switch
Q5N - UPS output switch
Remote Emergency Power Off - A switch used for shutting down electrical equipment from a location away from the equipment
REPO - Remote Emergency Power Off
SCR - Silicon controlled rectifier
Static Transfer - A solid state switching mechanism electronically controlled to pass AC power directly from the utility to an output load
Test connector - DB-9 type connector on the LCD panel allowing the UPS systems customer support service technician to access programmable and diagnostic features of the system
UL - Underwriters Laboratories, Inc
V - Volts
VA - Volt-amperes, unit for apparent power measurement, equal V x I
VAC - Voltage of AC type
Vdc - Voltage of DC type