Grounding The Switch With A Grounding Conductor Buried In The Earth Ground - HP 1910 Getting Started Manual

Figure 39 Connecting the grounding cable to a grounding strip
(1) Grounding post
(3) Grounding cable
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 at least 50 × 50 × 5 mm (1.97 × 1.97 × 0.20 in). The steel tube
must be zinc-coated and its wall thickness must be at least 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.
Figure 40 Grounding the switch by burying the grounding conductor into the earth ground
(1) Grounding screw
(4) Joint
(2) Grounding strip
(4) Hex nut
(2) Grounding cable
(5) Grounding conductor
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(3) Earth
(6) Chassis rear panel