Table 2
. Types of HP Power Distribution Cables
Description Receptacle
type
Conduit
length (ft)
Overall
wire
length (ft)
Metal-clad 3-wire split/single-phase
NEMA L5-30R
5
10
15
20
30
13
18
23
28
38
Metal-clad 3-wire split/single-phase
NEMA L6-20R
Same as
above
Same as
above
Metal-clad 3-wire split/single-phase
NEMA L6-30R
Same as
above
Same as
above
Metal-clad 3-wire split/single-phase
CS 8269
Same as
above
Same as
above
Metal-clad 4-wire three-phase
NEMA L15-30R
Same as
above
Same as
above
Metal-clad 5-wire three-phase
NEMA L21-30R
Same as
above
Same as
above
Metal-clad 4-wire three-phase
IEC 460C9
Same as
above
Same as
above
Configuration examples
This section includes basic configurations for using HP three-phase power components for high-density
systems.
High-density system using conventional cooling
Figure 12 shows a UPS rack with parallel HP RP12000/3 UPSs providing 60 kilowatts through a PD
rack and power distribution cables to a high-density system of four 15-kW ITE racks. In this example,
the ITE racks use conventional air cooling as supplied through plenums in a raised-floor facility. Note
that the racks can accommodate cables routed overhead or under the floor.
NOTE
Best practices dictate allowing for a certain amount of “headroom”
when planning UPS loading. The example in Figure 12 illustrates a
maximum loading scenario with no expansion headroom
.
The actual number of ITE racks that can be served by a UPS rack depends on the power density of
each rack. A 60-kW UPS rack can support:
•
10 low-density racks at 6 kilowatts per rack (larger than 2U servers, storage, networking
equipment)
•
5 medium-density racks at 12 kilowatts per rack (1U servers, small blade servers)
•
3 high-density racks at 20 kilowatts per rack ( smaller than 2U or densely-packed blade servers)
Online utilities for calculating the power requirements for HP server products are available at the URLs
provided in the section titled “
For more information
” at the end of this paper.
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