Dell PowerEdge 4350 Dell PowerEdge 4350 Systems User's Guide - Page 106

Dell PowerEdge, spikes

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C-8
Dell PowerEdge
4350 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.
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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:
²
Use one of the power protection devices described in the following section,
²Power Protection Devices.³
²
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 threat 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 its power source. Leaving the system
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.