Brother INTELLIFAX 900 - Manual (Page 9)

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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 a telephone (other than a cordless type) during an
electrical 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.