Panasonic KX-T7880 Reference Manual page 13

SAFETY INSTALLATION
INSTRUCTIONS
When installing telephone wiring, basic safety
precautions should always be followed to reduce
the risk of fire, electric shock and injury to
persons, including the following:
1.
2.
3.
4.
Never install telephone wiring during a light-
ning 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.