HP rp8400 Site Preparation Guide, Second Edition - HP rp8400 Server Series - Page 32

Electrical Load Requirements (Circuit Breaker Sizing), Power Quality, Sources of Voltage Fluctuations

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Electrical and Environmental Guidelines Electrical Factors The minimum recommended illumination level is 70 foot-candles (756 lumens per square meter) when the light level is measured at 30 inches (76.2 cm) above the floor. Electrical Load Requirements (Circuit Breaker Sizing) NOTE Local authority has jurisdiction [LAHJ] and should make the final decision regarding adherence to country- specific electrical codes and guidelines. Table 1-4 on page 7 and Table 1-5 on page 8 summarizes electrical power load (kVa input) requirements for rp8400 servers. These tables provide load requirements for computers, but additional capacity should be added for equipment upgrading or expansion. It is always a good idea to derate power distribution systems for one or more of the following reasons: • To avoid nuisance tripping from load shifts or power transients, circuit protection devices should never be run above 80% of their root-mean-square (RMS) current ratings. • Safety agencies derate most power connectors to 80% of their RMS current ratings. Power Quality This equipment is designed to operate over a wide range of voltages and frequencies. It has been tested and shown to comply with EMC Specification EN50082. However, damage can occur if these ranges are exceeded. Severe electrical disturbances can exceed the design specifications of the equipment. Sources of Voltage Fluctuations Voltage fluctuations, sometimes called glitches, affect the quality of electrical power. Common sources of these disturbances are: • Fluctuations occurring within the facility's distribution system • Utility service low-voltage conditions (such as sags or brownouts) • Wide and rapid variations in input voltage levels • Wide and rapid variations in input power frequency • Electrical storms • Large inductive sources (such as motors and welders) • Faults in the distribution system wiring (such as loose connections) • Microwave, radar, radio, or cell phone transmissions Power System Protection Computer systems can be protected from the sources of many of these electrical disturbances by using: • A dedicated power distribution system • Power conditioning equipment • Over- and under-voltage detection and protection circuits • Screening to cancel out the effects of undesirable transmissions 16 Chapter 2

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Chapter 2
Electrical and Environmental Guidelines
Electrical Factors
16
The minimum recommended illumination level is 70 foot-candles (756 lumens per square meter) when the
light level is measured at 30 inches (76.2 cm) above the floor.
Electrical Load Requirements (Circuit Breaker Sizing)
NOTE
Local authority has jurisdiction [LAHJ] and should make the final decision regarding
adherence to country- specific electrical codes and guidelines.
Table 1-4 on page 7 and Table 1-5 on page 8 summarizes electrical power load (kVa input) requirements for
rp8400 servers.
These tables provide load requirements for computers, but additional capacity should be added for equipment
upgrading or expansion.
It is always a good idea to derate power distribution systems for one or more of the following reasons:
•
To avoid nuisance tripping from load shifts or power transients, circuit protection devices should never be
run above 80% of their root-mean-square (RMS) current ratings.
•
Safety agencies derate most power connectors to 80% of their RMS current ratings.
Power Quality
This equipment is designed to operate over a wide range of voltages and frequencies. It has been tested and
shown to comply with EMC Specification EN50082. However, damage can occur if these ranges are exceeded.
Severe electrical disturbances can exceed the design specifications of the equipment.
Sources of Voltage Fluctuations
Voltage fluctuations, sometimes called glitches, affect the quality of electrical power. Common sources of these
disturbances are:
•
Fluctuations occurring within the facility’s distribution system
•
Utility service low-voltage conditions (such as sags or brownouts)
•
Wide and rapid variations in input voltage levels
•
Wide and rapid variations in input power frequency
•
Electrical storms
•
Large inductive sources (such as motors and welders)
•
Faults in the distribution system wiring (such as loose connections)
•
Microwave, radar, radio, or cell phone transmissions
Power System Protection
Computer systems can be protected from the sources of many of these electrical disturbances by using:
•
A dedicated power distribution system
•
Power conditioning equipment
•
Over- and under-voltage detection and protection circuits
•
Screening to cancel out the effects of undesirable transmissions