Panasonic KX-TDA15 Installation Manual page 52

2.2 Installation of the Hybrid IP-PBX
Outside Installation
Trunk
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 lightning protector for an extension and CS is different from that for trunks.
Installation of an Earth Rod
Trunk
(Underground)
1.
Installation location of the earth rod.....Near the protector
52 Installation Manual
(Main Building)
Lightning Protectors
Trunk
Terminal
Board
Extn.
Extn. Extn.
SLT PT CS
Lightning Protector
Earthing
Wire
Earth Rod
Extn.
Hybrid
IP-PBX
Lightning
Protector
Earth
Hybrid
IP-PBX
(Another Building)
SLT
PT
CS
Extn.: Extension Line