Dell Latitude Latitude LT System User Manual page 13

Modem Precautions
Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack is specifically
designed for wet locations.
Never touch uninsulated telephone wires or terminals unless the telephone line
has been disconnected at the network interface.
Use caution when installing or modifying telephone lines.
Avoid using the telephone during a lightning storm. There may be a remote risk
of electric shock from lightning.
Do not use the telephone to report a gas leak in the vicinity of the leak.
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