Panasonic KX-TD500 Installation Manual page 160

a)
Install the extension wire underground.
b)
Use a conduit to protect the wire.
Note
• The lightning protector for an extension is different from that for CO lines.
Installation of an Earth Rod
(Underground)
1.
Installation location of the earth rod.....Near the protector
2.
Check obstructions.....None
3.
Composition of the earth rod.....Metal
4.
Depth of the earth rod.....More than 50 cm (20 inches)
5.
Size of the grounding wire.....Thickness is more than 16 AWG
Note
• The above figures are recommendations only.
Installation
Lightning
Protector
CO
Grounding
Wire
Earth Rod
Main
Unit
2.11 Lightning Protectors
Figure 132:
161