Electrical Installation
7
Section 3: Electrical Installation
Only qualified individuals should perform power routing and termination to the display. It is the responsibility of the
electrical contractor to ensure that all electrical work meets or exceeds local and national codes. Improper installation
could result in serious damage to the equipment and be hazardous to personnel.
3.1 Preparing for Power/Signal Connection
Reference Drawing:
Time & Temp Power/Signal Hookup .......................................................
Drawing A-938369
Electrical installation consists of the following process:
• Providing power and ground to a disconnect near the display.
• Routing power and ground from the main disconnect to the display driver/power enclosure.
• Connecting the display ground to a grounding electrode at the display location.
• Routing the control signal cable from the control location to the display location.
Drawing A-938369 provides detailed instructions for power and signal connections for time and temperature
displays, including connection of the temperature sensor and connections between host and client displays.
Refer to this drawing before completing any part of the electrical installation.
3.2 Power Connections
Daktronics DataTime
®
displays have removable or hinged front panels that allow access to the digits, cabling,
and other electronic components.
DataTime
®
outdoor displays require a dedicated, 120 V circuit (or 230 V for international use) for incoming
power. The display itself has no breakers or fuses.
WARNING: The display circuit must be fused at 15 A, and all conductors must be designed to pass a 15 A
current in normal operation. Failure to meet wiring and over current protection device requirements is a
violation of the National Electrical Code and will void the display’s warranty.
3.3 Grounding Connections
Reference Drawing:
Enclosed Driver, 4 Column Reference ....................................................
Drawing A-938300
Displays MUST be grounded according to Article 250 of the National Electrical Code and according to
Daktronics specifications or the warranty will be void. Daktronics requires a resistance-to-ground of 10 ohms
or less.
The contractor performing the electrical installation must verify ground resistance. Technicians from
Daktronics Sales and Service offices can also provide this service.
Proper grounding is necessary for reliable equipment operation. It also protects the equipment from
damaging electrical disturbances and lightning. Drawing A-938300 illustrates where to connect the ground
wire at the driver enclosure.
