NonStop NS1000 Planning Guide (H06.05+)

Installation Facility Guidelines
HP Integrity NonStop NS1000 Planning Guide—542527-004
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
NS1000 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 3-2 and Modular Cabinets on page 5-3.
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 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 or power engineer.
Power Consumption
In an Integrity NonStop NS1000 system, the power consumption and inrush currents
per connection can vary because of the unique combination of enclosures housed in
the modular cabinet. Thus, the total power consumption for the hardware installed in
the cabinet should be calculated as described in Enclosure Power Loads on page 3-4.