NEC QX-S5500G Series - Grounding the Switch with a Grounding Conductor Buried in the Earth Ground

Installation Guide
QX-S5500G Series Ethernet Switches
3. Installing the switch
3-10
Figure 3-12 Connecting the grounding cable to a grounding strip
1
4
3
2
(1) Grounding post
(2) Grounding strip
(3) Grounding cable
(4) Hex nut
3.4.3 Grounding the switch with a grounding conductor buried in the earth
ground
If the installation site has no grounding strips, but earth ground is available, hammer a 0.5
m (1.64 ft.) or longer angle iron or steel tube into the earth ground to serve as a grounding
conductor.
The dimensions of the angle iron must be a minimum of 50 × 50 × 5 mm (1.97 × 1.97 × 0.20
in). The steel tube must be zinc-coated and its wall thickness must be a minimum of 3.5 mm
(0.14 in).
Weld the yellow-green grounding cable to the angel iron or steel tube and treat the joint for
corrosion protection.