Panasonic KX-TDA30 Installation Manual page 51

Outside Installation
Lightning Protectors
Trunk
Extn.
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 and CS is different from that for trunks.
Installation of an Earth Rod
Trunk
(Underground)
(Main Building)
Trunk
Terminal
Board
Extn.
Extn.
SLT PT CS
Lightning Protector
Earthing
Wire
Earth Rod
2.2 Installation of the Hybrid IP-PBX
Extn.
Hybrid
IP-PBX
Lightning
Protector
Earth
Hybrid
IP-PBX
(Another Building)
SLT
PT
CS
Extn.: Extension Line
Installation Manual 51