Stratus ftServer 2500, Site Planning Manual

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Electrical Power Planning 3-1
Chapter 3
Electrical Power Planning
3-
For information about planning appropriate AC electrical power for your system and its
peripheral components, see:

“Redundant Power Sources” on page 3-1

“AC Power and HVAC Service Requirements” on page 3-2

“Selecting a UPS Unit for ftServer Systems (Windows Systems)” on page 3-10

“Communicating with a UPS over a Network” on page 3-12

“Connecting Power to Systems, PDUs, and a UPS” on page 3-12

“Connecting a System Directly to a UPS” on page 3-14

“Power Cord Summary” on page 3-15

“Grounding Requirements” on page 3-18
Related Topic

Chapter 6, “Rack Configuration Planning”
Redundant Power Sources
ftServer systems require at least two separate and independent AC power
sources—an
A-side power source and a B-side power source—that provide power to
the system’s power receptacles, labeled A and B, respectively. Either source must be
capable of continuing to provide power if power to the other source is lost.
The A-side power source provides power to one side of each system and storage
enclosure, as well as to components that do not require two sources of power, such as
tape-drive enclosures and a monitor. If you use an uninterruptible power supply (UPS),
the UPS is, in these standard, documented, configurations, the A-side power source.
The B-side power source provides power to the other side of each system and storage
enclosure.
The wattage required from the A-side power source will always be equal to or greater
than the wattage required from the B-side power source.