Panasonic KX-TAW848 Installation Manual page 52

2.2 Installation of the PBX
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 in)
5.
Size of the grounding wire.....Thickness is more than 16 AWG
Notes
• The above figures are recommendations only.
• The length of earth rod and the required depth depend on the composition of the soil.
52 Installation Manual