Power Distribution - HP Xw25p - ProLiant - Blade Workstation Overview

HP offers two models of 3U power enclosure that are designed to meet installation power demand
and redundancy requirements, depending on the number and type of server blades you plan to
deploy:
• Single-phase HP BladeSystem 3U p-Class Power Enclosure (holds up to four power supplies)
• Three-phase HP BladeSystem 3U p-Class Power Enclosure (holds up to six power supplies)
Because the three-phase power enclosure holds up to six power supplies, it supports more server
blades and interconnect switches than the single-phase power enclosure. It is generally recommended
for the HP BladeSystem p-Class solution. For more detailed information about the specific power
enclosure options and power planning tools, refer to the HP BladeSystem p-Class website:
http://www.hp.com/go/bladesystem
Figure 22. HP BladeSystem p-Class 3U Power Enclosure (three phase shown) with power supplies

Power distribution

Power is carried from the power supplies in the power enclosure(s) or from the local –48V facility DC
power source to the server blade enclosures through either bus bars or a bus box. Bus bars are used
to support multi-enclosure deployments while the bus box is used to power a single server blade
enclosure, such as in a lab or test system environment.
The bus bars are attached directly to the RETMA rails in a rack. Hinges on the bus bars provide easy
rear access to the interconnect modules, network cables, server blade management modules, and
power management modules.
The three specific HP BladeSystem p-Class power distribution options are summarized in Table 14.
Deploying a full 42U rack of ProLiant BL p-Class server blades requires using two pairs of mini bus
bars.
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