Section 700: Glossary - Best Power UNITY/I UT310 Manual Del Usuario

SECTION 700: GLOSSARY

Ampere (Amp): A unit of electric current. One amp = a steady current produced by one volt
applied across a resistance of one ohm.
British thermal unit (BTU): A unit of heat energy. One BTU = the heat needed to raise the
temperature of one pound of air-free water from 60
F (15.5
C) to 61
F (16.1
C) at a
constant pressure of one standard atmosphere.
Decibel adjusted (dBa): A unit used to show the relationship between an acoustic noise
source and a reference sound power level of
85 dBm.
Ground (Earth): A conducting connection, whether intentional or accidental, by which an
electric circuit or electric 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 (AC Line): The input power source. It includes the conductors extending from the
service switch, the generator bus, or the converter bus to the main distribution center in
interior wiring.
Maintenance bypass cabinet (MBC): Contains the external bypass switch and the AC
disconnect switch.
Noise attenuation - differential mode: The ability to attenuate (reduce) noise, line to line.
Noise attenuation - common mode: The ability to attenuate (reduce) noise, line to ground
and neutral to ground.
Nominal voltage: The voltage at which a device operates under ideal conditions.
Out of Tolerance: Outside of the unit's programmed limits. If you would like these limits
reprogrammed, call BEST's Worldwide Service.
Power factor (PF): The ratio of the true (real) power to the apparent power of an alternating
current (AC) circuit.
Protective earth (PE): Same as the equipment grounding conductor. See Ground (Earth).
Static bypass: An internal bypass mode inside the unit. The unit must be programmed into
static bypass operation before an external bypass switch is used.
Static switch: An electronic switch that has no moving parts.
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