Panasonic KX-TDE100 Installation Manual page 80

3.2 Installation of the PBX
Outside Installation
Trunk
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 trunks.
Installation of an Earth Rod
Surge Protector
Trunk
Earthing
(Underground)
80 Installation Manual
(Main Building)
Surge Protector
Terminal
Board
Extn.
SLT
PT
CS
Wire
Earth Rod
Trunk
PBX
Extn.
Extn.
PBX
(Another Building)
Extn.
PT-interface CS
Surge
Protector
Earth
Extn.: Extension Line
SLT
PT
CS