Panasonic KX-NCP500 Installation Manual page 58

3.2.9 Surge Protector Installation
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)
58 Installation Manual
(Main Building)
Surge Protector
CO Line
Terminal
Board
Extn.
Extn.
Extn.
CS
PBX
Ground Rod
Extn.
PBX
Surge
Protector
Ground
Extn.: Extension Line
(Another Building)
SLT
PT
PT-interface CS
CS
Document Version 2011-10