NonStop NS-Series Servers Site Preparation (H06.03+)

Facility Guidelines
HP Integrity NonStop NS-Series Site Preparation Guide—527836-005
2-2
Electrical Power and Grounding Quality
Electrical Power and Grounding Quality
Proper design and installation of a power distribution system for an Integrity NonStop
NS-series server requires specialized skills, knowledge, and understanding of
appropriate electrical codes and the limitations of the power systems for computer and
data processing equipment. For power and grounding specifications, refer to Modular
Cabinet AC Input Power on page 3-1.
Power Quality
This equipment is designed to operate reliably over a wide range of voltages and
frequencies described in Enclosure AC Input on page 3-4. However, damage can
occur if these ranges are exceeded. Severe electrical disturbances can exceed the
design specifications of the equipment. Common sources of such 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)
Computer systems can be protected from the sources of many of these electrical
disturbances by using:
•
A dedicated power distribution system
•
Power conditioning equipment
•
Lightning arresters on power cables to protect equipment against electrical storms
For steps to take to ensure proper power for the servers, consult with your HP site
preparation specialist (refer to Appendix B, HP Site Services) or power engineer.
Grounding Systems
The site building must provide a power distribution safety ground/protective earth for
each AC service entrance to all NonStop server equipment. This safety grounding
system must comply with local codes and any other applicable regulations for the
installation locale.
For proper grounding/protective earth connection, consult with your HP site preparation
specialist (refer to Appendix B, HP Site Services) or power engineer.
Power Consumption
Due to the higher hardware concentration in Integrity NonStop NS-series systems, the
power consumption and inrush currents per connection are higher than in the earlier
NonStop S-series systems. Because each modular cabinet houses a unique