Daktronics Galaxy AF-3220 - Manual (Page 10)

6 Power Installation
• Displays use single-phase power. Proper power installation is imperative for display operation.
Main Disconnect
Daktronics requires using a power disconnect switch with the display. Use a disconnect so that all
ungrounded conductors can be disconnected near the point of power connection.
The disconnecting means must be located either in a direct line of sight from the display or can be locked
in the open position. This ensures that power will not be reconnected while service personnel work on the
display.
3.4 Grounding
Install this sign according national and applicable local codes. This includes proper grounding and bonding
of the sign.
Installation with Ground and Neutral
Conductors Provided
• These displays are installed
with ground and neutral
conductors provided. The
power cable must contain
an isolated earth-ground
conductor.
• Do not connect neutral to
ground at the disconnect or
at the display. This violates
electrical codes and voids the
warranty.
• 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.
The display system must be connected to an earth ground as shown in Figure 4. 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 void.
Primary
Mirror
Display
Ground Lug
Thermal Weld
Connection
Preferred
Conduit
Copper Ground Conductor
(One Per Display Face)
Copper Ground Rods
8 ft.(2.5 m)
min.
8 ft.(2.5 m)
min.
Figure 4: Correct Grounding