Daktronics AF-3400-12-RGB - Manual (Page 15)

Figure 5: Proper Grounding
Important points about grounding:
• Follow local and national codes: The material of an earth-ground electrode differs from
region to region and from conditions present at the site. Consult the National Electrical
Code and any local electrical codes that may apply.
• Support structure cannot be used as an earth-ground electrode: The support is
generally embedded in concrete. 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.
• Resistance to ground 10 ohms or less: This is required by Daktronics for proper display
performance. If the resistance to ground is higher than 10 ohms, it will be necessary to
install additional grounding electrodes to reduce the resistance. The grounding
electrode should be installed within 25 feet of the base of the display. The grounding
electrode must be connected to the ground lug on the back of the display (Figure 5).
Power Connection
Two options are possible for terminating power to the display:
• terminating power to the J-box.
• terminating power directly to the power termination panel inside the display.
Installation instructions for both are provided in this section.
Electrical Installation 9