HP A5120 EI Series

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Figure 21 Connecting the grounding cable to a grounding strip
(A)
(B)
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3
4
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4
(1) Grounding post
(2) Grounding strip
(3) Grounding cable
(4) Hex nut
Grounding to a buried grounding conductor
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, as shown in
Figure 22.
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 22 Ground the switch by burying the grounding conductor into the earth ground
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2
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6
(1) Grounding screw
(2) Grounding cable
(3) Earth
(4) Joint
(5) Grounding conductor
(6) Chassis rear panel