NonStop NS-Series Planning Guide (H06.05+)

Installation Facility Guidelines
HP Integrity NonStop NS-Series Planning Guide—529567-008
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 NS-Series Servers
Integrity NonStop NS-series servers without the optional HP 5500 XR UPS installed in
each 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 5500 XR UPS
The rackmounted HP 5500 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 contactor is required for your site, contact your HP
representation 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
EPO Requirement for NonStop S-Series I/O Enclosure
Each NonStop S-series I/O enclosure contains batteries and an EPO circuit. If an EPO
switch or relay contactor is required for your site, contact your HP representation or
refer to the NonStop S-Series Hardware Installation and FastPath Guide for connector
and wiring information. This guide is available in the NonStop Technical Library (NTL).
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 AC Input
Power for Modular Cabinets on page 3-2 and Modular Cabinets on page 5-4.
Note. The Integrity NonStop NS14000 system does not support connections to NonStop
S-series I/O enclosures.