NonStop NS1000 Planning Guide (H06.06+)

Installation Facility Guidelines
HP Integrity NonStop NS1000 Planning Guide—542527-002
2-2
Emergency Power-Off Switches
Emergency Power-Off Switches
Emergency power off (EPO) switches are required by local codes or other applicable
regulations when computer equipment contains batteries capable of supplying more
than 750 volt-amperes (VA) for more that five minutes. Systems that have these
batteries also have internal EPO hardware for connection to a site EPO switch or relay.
In an emergency, activating the EPO switch or relay removes power from all electrical
equipment in the computer room (except that used for lighting and fire-related sensors
and alarms).
EPO Requirement for Integrity NonStop NS1000 Servers
Integrity NonStop NS1000 servers without the optional HP R5500 XR UPS installed in
the modular cabinet do not contain batteries capable of supplying more than 750
volt-amperes (VA) for more that five minutes, so they do not require connection to a
site EPO switch.
EPO Requirement for HP R5500 XR UPS
The rackmounted HP R5500 XR UPS that can be optionally installed in a modular
cabinet contains batteries and has an EPO circuit. Consult your HP site preparation
specialist or electrical engineer regarding requirements for site EPO switches or relays.
If an EPO switch or relay connector is required for your site, contact your HP
representative or refer to the HP UPS R5500 XR Models User Guide for connector and
wiring. This guide is available at:
http://h10032.www1.hp.com/ctg/Manual/c00065453.pdf
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