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Dell PowerEdge 4300 Systems User's Guide
Each Dell system, when operating, is designed to withstand 0.25 G (half-sine wave) at
a sweep of 3 to 200 hertz (Hz) for 15 minutes. In storage, the system can withstand
0.5 G at 3 to 200 Hz for 15 minutes.
Systems are especially sensitive to variations in voltage supplied by the AC power
source. Over-voltage, undervoltage, and transients (or spikes ) can erase data from
memory or even cause components to fail. To protect against these types of prob-
lems, power cables should always be properly grounded and one or both of the
following methods should be used:
Use one of the power protection devices described in the following section,
"Power Protection Devices."
Place the system on a dedicated power circuit (rather than sharing a circuit with
other heavy electrical equipment). In general, do not allow the system to share a
circuit with any of the following:
— Copier machines
— Air conditioners
— Vacuum cleaners
— Space heaters
— Power tools
— Teletype machines
— Adding machines
— Laser printers
— Facsimile machines
— Any other motorized equipment
Besides these appliances, the greatest threats to a system's supply of power are
surges or blackouts caused by electrical storms. Whenever possible, turn off the sys-
tem and any peripherals and unplug them from their power sources during
thunderstorms.
If a blackout occurs—even a temporary one—while the system is turned on, turn off
the system immediately and disconnect it from the electrical outlet. Leaving the sys-
tem on may cause problems when the power is restored; all other appliances left on
in the area can create large voltage spikes that can damage the system.
A number of devices are available that protect against power problems such as power
surges, transients, and power failures. The following subsections describe some of
these devices.