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Electrical Installation
42
WARNING: It is critical that the scoreboard circuit be fused at 15 A and that all conductors
used must be designed to pass a 15 A current in normal operation. Failure to meet wiring and
overcurrent protection device requirements is a violation of the National Electrical Code
® and
will void the scoreboard warranty .
All power conductors are 14 AWG, except where 18 AWG wiring is called out on the
schematic. All signal conductors are 18 AWG.
Refer to the outdoor scoreboard schematics listed at the beginning of this section and to the
tables in
Section 3 to determine circuit specifications and maximum power requirements for
the models described in this manual.
Grounding
Reference Drawings:
Schematic; Multipurpose LED DRVR .................................................... Drawing A-165028
Schematic; GEN III & IV OD LED, 3 DRVR Display .............................. Drawing A-179541
Schematic; GEN III & IV, OD LED, 1 DRV w/TNMC ............................. Drawing A-179790
Schematic; GEN III & IV, OD LED, 3 DRV w/TNMC ............................. Drawing A-180081
Schematic; GEN III & IV, O.D. LED, 2 DRVR Display ........................... Drawing A-180637
Schematic; GEN IV Outdoor LED,16 Column DRVR ............................ Drawing A-285779
Schematic, GEN IV Outdoor Driver,8 Column Driver ............................ Drawing A-285881
Schematic; 240V GEN IV Outdoor LED, 16, COL Driver ...................... Drawing A-324504
Schematic; Baseball w/S.O.P. GEN IV, optional TNMC ........................ Drawing B-204725
Schematic; GEN III & IV OD LED, 1DRVR W/S.O.P. ............................ Drawing B-210454
Schematic; 3 DRVR, TNMC, G4 ............................................................ Drawing A-751690
Note: Displays MUST be grounded according to the provisions outlined in Article 250 of the
National Electrical Code and according to the specifications in this manual. 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 connected to an earth electrode installed at the display. Proper
grounding is necessary for reliable equipment operation. It also protects the equipment from
damaging electrical disturbances and lightning.
Note: The display must be properly grounded, or the warranty will be void.
Refer to the schematics listed at the beginning of this section for information about ground
wire connection. The connection is illustrated in the “Pwr In” detail on each of the
schematics.
The material for an earth-ground electrode differs from region to region and may vary
according to conditions present at the site. Consult the National Electrical Code and any local
electrical codes that may apply. The support structure of the display cannot be used as an
earth-ground electrode. The support is generally embedded in concrete, and if it is in earth,
the steel is usually primed or it corrodes, making it a poor ground in either case.