Daktronics Galaxy AF-3400 34 mm Monochrome/RGB - Manual (Page 20)

• One grounding electrode for each display face: The grounding electrode requires one
grounding rod for each display face. Other grounding electrodes as described in Article
250 of the National Electric Code may be used.
• Resistance to ground 10 ohms or less: This is required by Daktronics for proper display
performance. If the resistance to ground is higher than 10 ohms, it will be necessary to
install additional grounding electrodes to reduce the resistance. The grounding
electrode should be installed within 25 feet of the base of the display. The grounding
electrode must be connected to the ground lug on the back of the display (Figure 6).
3.5 Power Connection
Two options are possible for terminating power to the display.
Option 1: Connecting to the power termination J-box on the back of the display.
Option 2: Connecting directly to the power termination panel inside the display.
Installation instructions for both options are provided in this section.
Option 1: Terminating to the J-box enclosure
Figure 7: Location of J-box
1. Route the power cable through 3/4” conduit to the
rear of the display and into the power termination
enclosure.
2. The power termination enclosure will contain two or
three wires plus a ground coming from the interior of
the display. These wires are pre-terminated to the
power termination panel inside the display.
3. Inside the external power termination J-box, connect
the power wires to the wires coming from the display
interior using wire nuts. Refer to Figure 8
for a
diagram.
The following colors are used for the pre-terminated wires:
Figure 8: J-box Wiring
• Line 1 – Black (Brown – 240V)
• Line 2 – Red (only on three wire installations –
120/240V)
• Neutral - White (Blue – 240)
• Grounding Conductor – Green-Yellow
Power Installation 12