Daktronics Galaxy AF-3400 20 mm Monochrome/RGB Double-face Displays - Manual (Page 16)

Power Installation 8
6. Connect the grounding electrode conductor at the grounding lug near the J-box on
the right end of Face A.
7. Signal cable is routed to the signal termination enclosure. A grounding electrode
may also be connected there (when required).
8. Signal into the enclosures must be routed through 1/2"conduit.
9. The signal quick-connect cable from the enclosure to the display is routed into the
shrouding on the left end of the display cabinet.
Note: Daktronics strongly recommends that the quick-connect cable be secured to protect it
from weather and vandalism.
3.3 Power Requirements
Conductors of circuits delivering power to a Daktronics display shall be sized in
accordance with NEC and local electrical codes so that the power distribution
system is capable of delivering full load power to the display while maintaining a
voltage within 5% of the utility nominal voltage.
Each display uses a 120VAC or 120/240 VAC single-phase power source. Proper power
installation is imperative for proper display operation. Power specifications for various
display sizes can be found on Drawing A-305814 in Appendix A. The following sub-sections
provide details for display power installation.
Main Disconnect
The National Electrical Code requires the use of a lockable power disconnect near the
display. Provide a lockable disconnect switch (knife switch) at the display location so that all
power lines can be completely disconnected. Use a 3-conductor disconnect so that both hot
lines and the neutral can be disconnected. The main disconnect should be mounted at or near
the point of power supply connection. A main disconnect is to be provided for each supply
circuit to the display.
The disconnecting means must be located in a direct line-of-sight from the display or outline
lighting that it controls. This requirement enables a worker to keep the disconnecting means
within view while working on the display.
Exception: Disconnect components that are capable of being locked in the open position may
be located elsewhere.