Site Preparation Guidelines For The Ns7 System; Rack Power And I/O Cable Entry; Emergency Power-Off Switches - HP Integrity NonStop X NS7 Planning Manual

2 Site Preparation Guidelines for the NS7 System

This chapter provides guidelines for preparing a site for an NS7 system.

Rack Power and I/O Cable Entry

Depending on how the racks are ordered from Hewlett Packard Enterprise and the routing of the
AC power feeds at the site, AC power cords for the PDUs exit either:
Top: Power and I/O cables are routed from above the rack.
Bottom: Power and I/O cables are routed from below the rack.

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 than 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 NS7 Systems
NS7 systems without an optional UPS (such as an HPE R12000/3 or HPE R5000 UPS) installed
in the rack 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 R5000 UPS
NOTE: Two UPS are required for a single-phase power configuration.
The rack-mounted R5000 UPS is supported for a single-phase power configuration. Each UPS
contains batteries, has an EPO circuit, and can be optionally installed in a rack. For site EPO
switches or relays, consult your Hewlett Packard Enterprise site preparation specialist or electrical
engineer regarding requirements.
If an EPO switch or relay connector is required for your site, contact your Hewlett Packard
Enterprise representative or see the manual for your UPS for connectors and wiring for the UPS.
For information on the R5000 UPS manual, see
EPO Requirement for R12000/3 UPS
The rack-mounted R12000/3, UPS is supported for a three-phase power configuration. This UPS
contains batteries, has a remote EPO (REPO) port, and can be optionally installed in a rack. For
site EPO switches or relays, consult your Hewlett Packard Enterprise site preparation specialist
or electrical engineer regarding requirements.
If an EPO switch or relay connector is required for your site, contact your Hewlett Packard
Enterprise representative or see the manual for your UPS for connectors and wiring. For
information on the R12000/3 UPS manual, see
20 Site Preparation Guidelines for the NS7 System
"UPS and ERM (Optional)" (page
"UPS and ERM (Optional)" (page
17).
17).