Philips KX-TAW848 - Manual (Page 51)

2.2 Installation of the PBX
Installation Manual 51
Outside Installation
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 a CO line.
Installation of a Ground Rod
CS SLT APT
(Main Building)
CO Line
CO Line
Extn.
Extn.
Extn.: Extension Line
Ground
(Another Building)
Extn. Extn.
Surge Protector
Terminal
Board
Surge
Protector
SLT
APT
PBX
CS
CO Line
PBX
Grounding
Wire
Ground Rod
(Underground)
Surge Protector