GLOSSARY
Applicable Standards
153
GLOSSARY
Acronym/
Term
Definition
Description
AWG
American Wire Gauge
A standardized measurement of wire diameters important for
determining current-carrying capacity.
BAS
Building Automation System
A computer-based control system that controls and monitors a
building's mechanical and electrical equipment.
BMS
Building Management System
A computer-based control system that controls and monitors a
building's mechanical and electrical equipment.
BPC
Bypass Controller
EMI
Electromagnetic Interference
See RFI.
FLA
Full Load Amperes
The nameplate amperage rating of the motor when it is running
at its designed horsepower and on the motors designed voltage.
GFCI
Ground Fault Circuit Interrupter
A fast-acting circuit breaker designed to shut off electric power
in the event of a ground-fault within as little as 1/40 of a second.
GPM
Gallons per Minute
A unit of volumetric flow rate in the United States.
HMI
Human Machine Interface
An interface that permits interaction between a human and a
machine, such as a display and keyboard.
HOA
Hand/Off/Auto switching
IGBT
Insulated Gate Bipolar Transistor
A three-terminal power semiconductor device used as an elec
-
tronic switch to synthesize complex waveforms with pulse-
width modulation in a variable-frequency drive (VFD).
IP
International Protection rating
Used as protection measures for motors, electrical devices and
motors.
LDT
Load Detection Trip
MCCB
Molded Case Circuit Breaker
An MCCB provides protection by combining a temperature sen
-
sitive device with a current sensitive electromagnetic device.
MMS
Manual Motor Starter
An electromechanical protection device used to switch motors
ON/OFF manually and to provide fuseless protection against
short-circuit, overload and phase failures.
MOL
Motor Overload
NEC
National Electrical Code
A regionally adoptable standard for the safe installation of elec
-
trical wiring and equipment in the United States.
NEMA
National Electrical Manufacturer Association
The largest trade association of electrical equipment manufac
-
turers in the United States. NEMA publishes more than 700 stan
-
dards for electrical enclosures, motors and magnet wire, AC
plugs and receptacles, etc.
PFC
Power Factor Correction
PID
Proportional Integral Derivative
A control loop feedback mechanism used in applications requir
-
ing continuously modulated control.
PLC
Programmable Logic Controller
A digital computer used for automation of typically industrial
electromechanical processes.
PMA
Pump and Motor Assembly
PWM
Pulse Width Modulation
A modulation technique used to control the power supplied to
electrical devices, especially for motor speed control.
RFI
Radio Frequency Interference
A disturbance generated by an external source that affects an
electrical circuit by electromagnetic induction, electrostatic cou
-
pling, or conduction.
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