MGE UPS Systems EX-7 - Manual (Page 72)

dBrnC Decibel above reference noise.
DC or dc Direct current, or voltage.
Earth ground A ground circuit that has contact with the earth.
Electrician Refers to an installation electrician qualified to install heavy-duty electrical components in
accordance with local codes and regulations. Not necessarily qualified to maintain or repair
electrical or electronic equipment.
FET Field effect transistor.
Freq. Frequency.
Frequency slew rate The change in frequency per unit of time. Given in term of Hz per second (Hz/sec.).
GND Ground (safety).
Hz Hertz, frequency measurement unit, 1Hz is one cycle per second.
Inverter mode See “on-line” mode.
I Current.
IEC International Electrotechnical Commission.
IEEE Institute of Electrical and Electronic Engineers.
Input branch circuit The input circuit from the building power panel to the equipment.
Inverter An electrical circuit that generates an AC voltage source from a DC voltage source.
IGBT Insulated gate bipolar transistors.
I/O Input/Output.
I/T or IT Information Technology.
kVA KiloVolt-Ampere; is equal to 1000 Volt-Ampere.
L Line.
LCD Liquid-Crystal Display unit.
LED Light Emitting Diode.
Mains or Mains 1 Main AC input source.
Mains 2 Bypass AC input source.
mA Milliampere.
MAX. Maximum.
MCM Thousand circular mil; standard wire sizes for multiple stranded conductors over 4/0 AWG
in diameter. M is from Roman numerical system indicating 1000.
N Neutral.
NC Normally closed.
NO Normally open.
NEC National Electrical Code.
NFPA National Fire Protection Association.
EX 5/7/11RT Systems
Glossary G — 2 86-86000-00 B00