Dell OptiPlex E1 Reference And Installation Manual page 3

Use the following safety guidelines to help protect your computer system from poten-
tial damage and to ensure your own personal safety.
As you use your computer system, observe the following safety guidelines.
To help avoid damaging your computer, be sure the voltage selection switch on
the power supply is set to match the AC power available at your location:
— 115 volts (V)/60 hertz (Hz) in most of North and South America and some Far
Eastern countries such as Japan, South Korea, and Taiwan
— 230 V/50 Hz in most of Europe, the Middle East, and the Far East
Also be sure your monitor and attached peripherals are electrically rated to oper-
ate with the AC power available in your location.
Before working inside the computer, unplug the system to help prevent electric
shock or system board damage. Certain system board components continue to
receive power any time the computer is connected to AC power.
To help avoid possible damage to the system board, wait 5 seconds after turning
off the system before disconnecting a device from the computer.
To help prevent electric shock, plug the computer and peripheral power cables
into properly grounded power sources. These cables are equipped with
three-prong plugs to help ensure proper grounding. Do not use adapter plugs or
remove the grounding prong from a cable. If you must use an extension cable,
use a three-wire cable with properly grounded plugs.
To help protect your computer system from sudden, transient increases and
decreases in electrical power, use a surge suppressor, line conditioner, or un-
interruptible power supply (UPS).
Be sure nothing rests on your computer system's cables and that the cables are
not located where they can be stepped on or tripped over.
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