Daktronics AF-3700-20 RGB - Manual (Page 22)

• Support structure cannot be used as an earth-ground electrode: The support is
generally embedded in concrete, and if in earth, the steel is either primed or it corrodes,
making it a poor ground.
• One grounding electrode for each display face: The grounding electrode is typically one
grounding rod for each display face. Other grounding electrodes as described in Article
250 of the National Electric Code may be used.
Note: Each section of a sectional display has a ground lug but only one lug per display
face needs to be connected to the ground rod. A bonding jumper runs between sections.
Grounding Sectional Displays
In addition to following all the requirements of general
grounding, sectional displays have a few additional
requirements.
Figure 15: Grounding Sectional Displays
Each section of a sectional display will contain a ground
lug. Only one of these lugs needs to be connected to
earth ground. Refer to Figure 15.
A bonding jumper is present in the top section. Connect
this to the bottom section by unscrewing the nut,
placing the loop end of the cable over the screw, and
replacing the nut. Refer to Figure 16.
Figure 16: Bonding Jumper
Attachment
Power Installation 12