NEC Express5800/320Ma, Planning Manual, Page: 25 / 80

Electrical (AC) Power Planning 4-1
Chapter 4
Electrical (AC) Power Planning
4-
For information about planning appropriate AC electrical power for your
Express5800/320Ma 3.2 GHz, 3.6 GHz, oe Dual-Core system, see:
•
“Redundant Power Sources” on page 4-1
•
“AC Power Service Requirements” on page 4-2
•
“Power Outlet Requirements” on page 4-4
•
“Connecting a System Directly to Two Separate Power Sources” on page 4-5
•
“NEC-Supplied Power Cords” on page 4-6
Related Topics
•
Chapter 5, “UPS Planning”
•
Chapter 7, “Rack Configuration Planning”
Redundant Power Sources
Express5800/320Ma 3.2 GHz, 3.6 GHz, and Dual-Core 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,
respectively, A and B. 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 components that do not require two
sources of power: a KVM switch. If you use an uninterruptible power supply (UPS), the
UPS is the A-side power source.
The B-side power source provides power to the other side of each system.
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.