Panasonic KXTA308 - ANALOG PBX Installation Manual page 36

2.3.3 Outside (CO) Line Connection
Installation of an Earth Rod
2-12 Installation
Lightning
Protectors
CO
Grounding Wire
(Underground)
1) Installation location of the earth rod . .
2) Check obstructions . . . . . . . . .
3) Composition of the earth rod . . . . .
4) Depth of the earth rod
5) Size of the grounding wire . . . . . .
6) Length of the grounding wire
Note • The above example is only a recommendation.
• The length of the earth rod and required depth depend on the
composition of the soil.
System
Rod
. . . . . . .
. . . .
Near the protector
None
Metal
More than 50 cm
{20 inches}
Thickness more than
18 AWG
As short as possible