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2 Site Preparation Guidelines
This section describes power, environmental, and space considerations for your site.
Modular Cabinet Power and I/O Cable Entry
Power and I/O cables can enter the NonStop BladeSystem from either the top or the bottom rear
of the modular cabinets, depending on how the cabinets are ordered from HP and the routing
of the AC power feeds at the site. NonStop BladeSystem cabinets can be ordered with the AC
power cords for the PDUs exiting either:
• Top: Power and I/O cables are routed from above the modular cabinet.
• Bottom: Power and I/O cables are routed from below the modular cabinet
For information about modular cabinet power and cable options, refer to “AC Input Power for
Modular Cabinets” (page 44).
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 NonStop BladeSystems
NonStop BladeSystems without an optional UPS (such as an HP R12000/3 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 R12000/3 UPS
The rack-mounted HP R12000/3, 12kVA UPS can be optionally installed in a modular cabinet,
contains batteries, and has a remote EPO (REPO) port. For site EPO switches or relays, consult
your HP site preparation specialist or electrical engineer regarding requirements.
If an EPO switch or relay connector is required for your site, contact your HP representative or
refer to the HP 3 Phase UPS User Guide for connector and wiring for the 12kVA model. This guide
is available at:
http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c01079392/c01079392.pdf
Electrical Power and Grounding Quality
Proper design and installation of a power distribution system for a NonStop BladeSystem 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” (page 44).
Power Quality
This equipment is designed to operate reliably over a wide range of voltages and frequencies,
described in “Enclosure AC Input” (page 45). However, damage can occur if these ranges are
Modular Cabinet Power and I/O Cable Entry 31