NonStop NS2400 Series Planning Guide

3 Site Preparation Guidelines for NonStop NS2400 Series
Systems
This section describes power, environmental, and space considerations for a NonStop NS2400
series system at your site.
Modular Cabinet Power and I/O Cable Entry
Power and I/O cables can enter the NonStop NS2400 series system 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 NS2400 series system 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.
NOTE: To provide redundancy, components are plugged into the extension bars on each
side of the rack.
For information about modular cabinet power and cable options, see “AC Input Power for Modular
Cabinets” (page 67).
Emergency Power-Off (EPO)
This section describes these EPO topics:
• “EPO Switches” (page 46)
• “EPO Requirement for NonStop NS2400 Series Systems” (page 46)
• “EPO Requirement for HP R5000 UPS” (page 46)
• “EPO Requirement for HP R12000/3 UPS” (page 47)
EPO Switches
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 NS2400 Series Systems
NonStop NS2400 series systems without an optional UPS (such as an HP R5000 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 R5000 UPS
The rack-mounted HP R5000 UPS is supported for a single-phase power configuration. The UPS
contains batteries, has an EPO circuit, and can be optionally installed in a modular cabinet. 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 UPS R5000 User Guide for connectors and wiring information at http://
h20000.www2.hp.com/bc/docs/support/SupportManual/c02945229/c02945229.pdf.
46 Site Preparation Guidelines for NonStop NS2400 Series Systems