Daktronics FB-2500 Modular LED Football Scoreboard - Manual (Page 17)

Electrical Installation 11
Section 3: Electrical Installation
CAUTION: Only qualified individuals should terminate power and signal cable and access the
electrical components of the display and its associated equipment. It is the responsibility of the
electrical contractor to ensure that all electrical work meets or exceeds local and national codes.
Daktronics engineering staff must approve all changes or the warranty will be void.
3.1 Power
Correct power installation is imperative for proper display operation. The subsections that
follow give details of display power installation. Only qualified individuals should attempt to
complete the electrical installation; untrained personnel should not attempt to install these
displays or any of the electrical components. Improper installation could result in serious
damage to the equipment or injury to personnel.
Multi-section outdoor scoreboards require a dedicated 120 V (or 240 V for international use)
circuit for incoming power (refer to Appendix A). The display itself has no breakers or fuses.
WARNING: It is critical that 120 V scoreboard circuits be fused at 20 A and that all
conductors used must be designed to pass a 20 A current in normal operation. For 240 V
scoreboards, consult local electrical codes. Failure to meet wiring and overcurrent
protection device requirements will void the scoreboard warranty.
Grounding
The display must be properly grounded according to local and national codes or the warranty
will be void. Proper grounding is necessary for reliable equipment operation and protects the
equipment from damaging destructive disturbances and lightning.
Daktronics recommends a resistance-to-ground of 10 ohms or less. The electrical contractor
performing the electrical installation can verify ground resistance. Daktronics Sales and
Service personnel can also provide this service.
The display system must be earth-ground. The material for an earth-ground electrode differs
from region to region and may vary according to conditions present at the site. Consult local
and national electrical codes.
Daktronics does not recommend using the support structure as an earth-ground electrode;
concrete, primer, corrosion, and other factors make the support structure a poor ground.
Note: The support structure may be used as an earth-ground electrode only if designed to
do so. A qualified inspector must approve the support structure and grounding methods.
There are two types of power installation: installation with ground and neutral conductors
provided, and installation with only a neutral conductor provided. These two power
installations differ slightly, as described in the following paragraphs: