HP Integrity rx2620 Site Preparation Guide. First Edition - HP Integrity rx262 - Page 19

Distribution Hardware

Get HP Integrity rx2620 PDF manuals and user guides View all HP Integrity rx2620 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 19 highlights

General Site Preparation Guidelines Electrical Factors 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 The hp Integrity rx2620 Server 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 • Lightning arresters on power cables to protect equipment against electrical storms Precautions have been taken during power distribution system design to provide immunity to power outages of less than one cycle. However, testing cannot conclusively rule out loss of service. Therefore, adherence to the following guidelines provides the best possible performance of power distribution systems for HP computer equipment: • Dedicated power source-Isolates an hp Integrity rx2620 Server power distribution system from other circuits in the facility. • Missing-phase and low-voltage detectors-Shuts equipment down automatically when a severe power disruption occurs. For peripheral equipment, these devices are recommended but optional. • Online uninterruptible power supply (UPS)-Keeps input voltage to devices constant and should be considered if outages of one-half cycle or more are common. Refer to qualified contractors or consultants for each situation. Distribution Hardware This section describes wire selection and the types of raceways (electrical conduits) used in the distribution system. Wire Selection Use copper conductors instead of aluminum, because aluminum's coefficient of expansion differs significantly from that of other metals used in power hardware. Because of this difference, aluminum conductors can cause connector hardware to work loose, overheat, and fail. Chapter 2 19

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
General Site Preparation Guidelines
Electrical Factors
Chapter 2
19
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
The hp Integrity rx2620 Server 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
•
Lightning arresters on power cables to protect equipment against electrical storms
Precautions have been taken during power distribution system design to provide immunity to power outages
of less than one cycle. However, testing cannot conclusively rule out loss of service. Therefore, adherence to
the following guidelines provides the best possible performance of power distribution systems for HP
computer equipment:
•
Dedicated power source—Isolates an hp Integrity rx2620 Server power distribution system from other
circuits in the facility.
•
Missing-phase and low-voltage detectors—Shuts equipment down automatically when a severe power
disruption occurs. For peripheral equipment, these devices are recommended but optional.
•
Online uninterruptible power supply (UPS)—Keeps input voltage to devices constant and should be
considered if outages of one-half cycle or more are common. Refer to qualified contractors or consultants
for each situation.
Distribution Hardware
This section describes wire selection and the types of raceways (electrical conduits) used in the distribution
system.
Wire Selection
Use copper conductors instead of aluminum, because aluminum’s coefficient of expansion differs significantly
from that of other metals used in power hardware. Because of this difference, aluminum conductors can cause
connector hardware to work loose, overheat, and fail.