Connecting the Power Cords and the Ground Wire 31
Note: The fire main and lightning rod of a building are not suitable for
grounding the switch. The ground wire of the switch should be connected
to the grounding device for the equipment room.
Figure 16 Ground the switch through a grounding strip
2 When there is no grounding strip but earth is available near the installation
location and allows a grounding body to be buried, hammer an angle
iron/steel pipe longer than 0.5 m (1.64 ft.) into the earth. Weld the
yellow-green ground wire of the switch onto the angle iron/steel pipe, and
treat the joint for corrosion protection.
(1) Power input on the switch (2) Grounding screw on the switch
(3) Protection ground wire (4) Grounding strip
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(2)
(3)
(4)
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