Panasonic KX-TD500 Installation Manual page 174

Installation
Outside Installation
CO
EXT
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.
174
(Main Building)
Protectors
CO
CO
Ter-
Main
minal
Unit
Board
EXT
EXT
PT
SLT
(Another Building)
SLT
EXT
PT
Lightning
Protector
Ground
Installation Manual