Panasonic KX-TDE100 Installation Manual page 75

Outside Installation
CO Line
SLT
PT
PT-interface CS
If you install an extension outside of the building, the following precautions are recommended:
a.
Install the extension wire underground.
b.
Use a conduit to protect the wire.
Note
The surge protector for an extension and CS is different from that for CO lines.
Installation of a Ground Rod
Surge Protector
CO Line
Grounding
Wire
(Underground)
Document Version 2010-08
(Main Building)
Surge Protector
CO Line
Terminal
Board
Extn.
Extn.
Extn.
CS
PBX
Ground Rod
Extn.
PBX
Surge
Protector
Ground
Extn.: Extension Line
3.2.13 Surge Protector Installation
(Another Building)
SLT
PT
PT-interface CS
CS
Installation Manual 75