Daktronics AF-3700-20 RGB - Manual (Page 20)

Power Installation 10
7. Signal cable is routed to the signal termination enclosure. When a ground cable is
provided with the enclosure, ground the enclosure to an isolated earth ground
connector.
8. Signal into the enclosures must be routed through conduit. The knockouts in the
enclosures require the use of ½" conduit.
9. The signal quick-connect cable from the enclosure to the display can be routed
through conduit or through the display pole if power is not also routed in the display
pole.
Note: Daktronics strongly recommends that the quick-connect cable be secured to protect it
from weather or vandalism.
3.3 Power Requirements
Do not connect the displays to any voltage other than that listed on the Daktronics product
label.
Important Note: 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 size may be constructed to use either single-phase or three-phase power, with
the exception of the 16 high displays which use only single-phase power. Proper power
installation is imperative for proper display operation. Power specifications for various size
displays can be found in Appendix A. The following sub-sections provide general details of
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 disconnect so that all hot lines and the
neutral can be disconnected. The main disconnect should be mounted at or near the point of
power 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.