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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 30 minutes. In storage, the system can withstand 0.5 G at 3 to 200 Hz for 30 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:

‡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.

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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.

D-8 Dell Precision 210 Desktop Systems User’s Guide