Daktronics GPR-12EV-RGB - Manual (Page 19)

Power Installation 13
The display system must be connected to earth ground as shown in Figure 13. Proper
grounding protects the equipment from damaging electrical disturbances and lightning.
Daktronics requires a resistance to ground of 10 ohms or less. The display must be properly
grounded or the warranty will be null and void.
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 any electrical
codes that apply.
• Support structure cannot be used as an earth-ground electrode: The support is
generally embedded in concrete, and if embedded in earth, the steel is either primed
or it corrodes, making it a poor ground.
• One grounding electrode for each display face: Grounding is connected between
sections. Other grounding electrodes as described in national and local electrical
codes 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 is
necessary to install additional grounding electrodes to reduce resistance. The
grounding electrode must be installed within 25 feet (7.6 m) of the display’s base and
must be connected to the ground lug on the back of the display, as shown in Figure
13.
Figure 13: Correct Grounding