Compaq 226824-001 - ProLiant - ML750 Basics Manual page 39

Jumper cable assembly: The power connection between a server and intermediate equipment such as
a power distribution unit. Usually a jumper cable employs IEC-type connectors.
Kilovolt amperes (kVA): A term and method for rating electrical devices by multiplying the rated
output (amperes) by the rated operating voltage (volts).
Kilowatt (kW): As a measure of power capacity, a kilowatt is one thousand watts.
Kilowatt-hours (kWh): A measurement for work that has been done over time.
kVA: Kilovolt ampere
KVM: Keyboard/video/mouse peripherals. A KVM switch is a component that switches a single KVM
set between two or more server units.
kW: Kilowatt
kWh: Kilowatt-hour
Leakage current: If one or more pieces of equipment become separated from ground, the resulting
power buildup in the chassis, known as leakage current, can cause an electric shock. HP highly
recommends proper wiring techniques and a permanent ground connection. (The current that flows
from the AC mains to ground in a power supply is usually measured in milliamps with limits specified
by safety agencies.)
Line: A power plug contact.
Line cord: A cord, terminating in a plug at one end, used to connect equipment to a power unit.
Live (hot) contact (conductor, core, line, pin, pole, prong, terminal) (in Australia: Active contact): A
power plug element that conducts an AC electric flow of a voltage that varies by national and
industry standards.
Low-line voltage: Generally in a residential setting, 90-132V (100-120V nominal rating) AC power is
the appliance standard in North America, Latin America, and Japan. Also referred to as low voltage.
Mains: The utility supplied power source. The main electrical source coming from the utility into the
building or home. This is a British or Australian term.
Megawatt-hours (MWh): A measurement for work that has been done over time.
MWh: Megawatt-hour
Modular PDU: Modular power distribution units consist of a control core that connects to the power
bus (or UPS) and extension bars that distribute power to the equipment groups within the rack.
National Electrical Code (NEC): A comprehensive guide to building electrical codes and best
practices in the United States. The 2005 volume of this book is the 50th edition.
National Electrical Manufacturers Association (NEMA): A national organization that publishes
standard wire, plug, and cable specifications in the United States.
National Fire Protection Association (NFPA): Publisher of the National Electrical Code (NEC) of the
United States.
NEC: National Electrical Code
NEMA: National Electrical Manufacturers Association
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