Panasonic KX-TD500 Installation Manual page 180

2.11 Lightning Protectors
Outside Installation
CO
If you install an extension outside of the main building, the following precautions are
recommended:
a)
Install the extension wire underground.
b)
Use a conduit to protect the wire.
Note
• The lightning protector for an extension is different from that for CO lines.
180
(Main Building)
Protectors
CO
CO
Ter-
minal
Board
EXT
EXT EXT
TEL
TEL
EXT
Main
Unit
Lightning
Protector
Ground
(Another Building)
SLT
PT
Installation