UT340, UT360, UT380, and UT3100
Planning and Installation Manual
34
Ground (Earth):
A conducting connection, whether intentional or accidental, by which an electric circuit or
equipment is connected to earth or to some conducting body that serves in place of earth.
Load tolerance - symmetrical:
Equally balanced loads on a three-phase system.
Load tolerance - asymmetrical:
Unbalanced loads on a three-phase system.
Mains:
The conductors extending from the service switch, generator bus, or converter bus to the main distribution
center in interior wiring. Synonymous with power source.
Noise attenuation - differential mode:
The ability to attenuate noise, line to line.
Noise attenuation - common mode:
The ability to attenuate noise, line to ground and neutral to ground.
Nominal voltage:
The voltage at which a device operates under ideal conditions.
Power factor (PF):
The ratio of the true (real) power to the apparent power: root means-square (RMS) voltage
times RMS current of an alternating current circuit.
Protective earth (PE):
Synonymous with grounding electrode conductor.
Static switch:
An electronic switch that has no moving parts.
702 Abbreviations
BCA Battery cabinet assembly
DCD DC disconnect switch (may be a separate switch or a switch located on the battery cabinet/rack)
MBB Maintenance bypass breaker
MBC Maintenance bypass cabinet
MIB Main input breaker
MOB Main output breaker
SKRU Solenoid key release unit
UIB UPS input breaker
UOB UPS output breaker
Best Power Technology, Incorporated, reserves the right to change specifications without prior notice.
