HP DL360 Power basics for IT professionals - Page 40

Plug: A power plug. See Power plug., Outlet: A power socket. See Power socket.

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Neutral (cold) contact (conductor, core, line, pin, pole, prong, terminal): A power plug element that connects in most cases with the ground and is not dangerous outside of fault conditions (such as a broken neutral wire in the cable). It is wise to treat a neutral contact as a live contact throughout most installation practices. NFPA: National Fire Protection Association Nominal rating: The voltage or amperage specified by NEC or IEC standards for a given line or circuit. Actual voltage may vary due to a variety of conditions. The nominal rating for a device is a typical rating, as opposed to the maximum rating of a fully loaded unit. Ohm: A unit of electrical resistance. One ohm equals the resistance of a circuit where a potential difference of one volt produces a current of one ampere. This is known as Ohm's Law. Outlet: A power socket. See Power socket. PDU: Power distribution unit PFC: Power factor correction Phase: Each wire that carries alternating current at a specified voltage. (Neutral carries current but at zero potential.) In a three-phase circuit, three wires carry AC currents, each wire 120 degrees "out of phase" with the others. Pin: A power plug contact. Plenum: The return air region above the suspended ceiling of a traditional data center. Plenum grilles: The air vents that allow return air flow to reach the plenum. Plug: A power plug. See Power plug. Plug-in: A power socket. See Power socket. Polarity: The positive characteristics or the negative characteristics of two poles. Polarized power plug: An asymmetrical power plug designed to connect with a power socket in only one way, to avoid confusion between contacts with positive and negative polarity. (An unpolarized power plug may connect with a power socket with its live and neutral contacts turned either way.) Pole: An attachment point or electrical path for a current. Every phase requires a pole. Polyphase power: Two-phase, three-phase, or higher phase power. Pooled power: Power supply redundancy (provided with HP BladeSystem c-Class server blade) lowers inrush and leakage currents while efficiently and affordably delivering the right amount of power to multiple servers in a rack. Potential: The potential (and often differential) energy of a circuit or conductor, expressed mathematically but understood metaphorically as similar to the concepts of pressure and flow, usually synonymous with voltage. Power: For the rate at which electricity flows (watts), multiply voltage (volts) times current (amperes); or multiply resistance (ohms) by current (amps) squared. For the rate at which power flows, divide watts by time. Power cord assembly: The power connection between a server and the electric utility (power socket), generally employing connectors matching the national standards where the server was purchased. Power density: The amount (product) of amps and voltage provided to a system (VA). A 120-VAC 30amp circuit will deliver a power density of 3600 VA while a 208-VAC 30-amp circuit (single-phase) will deliver a power density. 40

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Neutral (cold) contact (conductor, core, line, pin, pole, prong, terminal): A power plug element that
connects in most cases with the ground and is not dangerous outside of fault conditions (such as a
broken neutral wire in the cable). It is wise to treat a neutral contact as a live contact throughout most
installation practices.
NFPA: National Fire Protection Association
Nominal rating: The voltage or amperage specified by NEC or IEC standards for a given line or
circuit. Actual voltage may vary due to a variety of conditions. The nominal rating for a device is a
typical rating, as opposed to the maximum rating of a fully loaded unit.
Ohm: A unit of electrical resistance. One ohm equals the resistance of a circuit where a potential
difference of one volt produces a current of one ampere. This is known as Ohm’s Law.
Outlet: A power socket. See Power socket.
PDU: Power distribution unit
PFC: Power factor correction
Phase: Each wire that carries alternating current at a specified voltage. (Neutral carries current but at
zero potential.) In a three-phase circuit, three wires carry AC currents, each wire 120 degrees “out of
phase” with the others.
Pin: A power plug contact.
Plenum: The return air region above the suspended ceiling of a traditional data center.
Plenum grilles: The air vents that allow return air flow to reach the plenum.
Plug: A power plug. See Power plug.
Plug-in: A power socket. See Power socket.
Polarity: The positive characteristics or the negative characteristics of two poles.
Polarized power plug: An asymmetrical power plug designed to connect with a power socket in only
one way, to avoid confusion between contacts with positive and negative polarity. (An unpolarized
power plug may connect with a power socket with its live and neutral contacts turned either way.)
Pole: An attachment point or electrical path for a current. Every phase requires a pole.
Polyphase power: Two-phase, three-phase, or higher phase power.
Pooled power: Power supply redundancy (provided with HP BladeSystem c-Class server blade) lowers
inrush and leakage currents while efficiently and affordably delivering the right amount of power to
multiple servers in a rack.
Potential: The potential (and often differential) energy of a circuit or conductor, expressed
mathematically but understood metaphorically as similar to the concepts of pressure and flow, usually
synonymous with voltage.
Power: For the rate at which electricity flows (watts), multiply voltage (volts) times current (amperes); or
multiply resistance (ohms) by current (amps) squared. For the rate at which power flows, divide watts
by time.
Power cord assembly: The power connection between a server and the electric utility (power socket),
generally employing connectors matching the national standards where the server was purchased.
Power density: The amount (product) of amps and voltage provided to a system (VA). A 120-VAC 30-
amp circuit will deliver a power density of 3600 VA while a 208-VAC 30-amp circuit (single-phase)
will deliver a power density.
40