NonStop NS2200 Series Planning Guide

Power Quality
This equipment is designed to operate reliably over a wide range of voltages and frequencies.
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)
• 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.
Power Consumption
Because each cabinet houses a unique combination of enclosures, calculate the total power
consumption for the hardware installed in each cabinet using the worksheet for the server you are
installing. Then add together the total power consumption values for all the cabinets in the system.
For enclosure power specifications and power worksheets, see Chapter 9 (page 132).
DC Power System Warnings
WARNING! To reduce the risk of electric shock or damage to the equipment HP NonStop
NS2200T and NS2200ST DC power supplies must be installed in accordance with the following
guidelines:
• This product is intended to be installed only in a restricted access location.
• This product is intended to be connected to a DC power source that can be classified as a
secondary circuit in accordance with applicable National requirements for Information
Technology Equipment. Generally, these requirements are based on the International Standard
for Safety of for Information Technology Equipment, IEC 60950-1.
• The system is suitable for installation as part of the Common Bonding Network (CBN).
• This product must be connected to a power distribution device that provides a means for
disconnecting power from the branch supply circuit. The power distribution device must be
provided with an over-current protective device suitable for interrupting fault currents available
from the main source.
• The rack must be connected to site ground.
• The green/yellow ground cable assemblies for enclosures in the racks must be connected to
the cabinet grounding rail. Do not rely on the rack or cabinet chassis to provide adequate
ground/earth continuity.
• The Battery Return (BR) Input Terminals are considered to be an Isolated DC Return (DC-I).
• Never connect cables to a terminal when there is power supplied to that circuit.
128 Site Preparation Guidelines for NonStop NS2200T and NS2200ST Systems