13
Figure 13 Connecting the grounding cable to a grounding strip
(1) Groundin
post
(2) Groundin
strip
(3) Grounding cable (4) Hex nut
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 14 Grounding the switch by burying the grounding conductor into the earth ground
(1) Grounding screw (2) Chassis rear panel (3) Grounding cable
(4) Earth (5) Joint
(6) Groundin
conductor
Grounding the switch by using the AC power cord
If the installation site has no grounding strips or earth ground, you ground an AC-powered switch through
the PE wire of the power cord. Make sure that: