Daktronics DataTime Outdoor LED Time & Temperature Displays - Manual (Page 14)

The table below shows the circuit specifications and maximum power requirements for each
model.
DataTime Time and Temperature Displays
Model Digit Size Maximum Power Circuit Requirements
DF-1010-10 10" (254 mm) 150 W 120 VAC – 15 A
DF-1010-13 13" (330 mm) 150 W 120 VAC – 15 A
DF-1010-18 18" (457 mm) 150 W 120 VAC – 15 A
DF-1010-24 24" (610 mm) 150 W 120 VAC – 15 A
DF-1011-10 10” (254mm) 150 W 120 VAC – 15 A
DF-1011-13 13” (330 mm) 150 W 120 VAC – 15 A
DF-1011-18 18” (457 mm) 150 W 120 VAC – 15 A
DF-1011-24 24” (610 mm) 150 W 120 VAC – 15 A
Grounding
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. 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.
The display system must be connected to an earth electrode installed at the display. Proper
grounding is necessary for reliable equipment operation. It also protects the equipment from
damaging electrical disturbances and lightning. The display must be properly grounded, or
the warranty will be void. Refer to Drawing A-938300, for information on where to connect
the grounding wire. Connection at the driver enclosure terminal block is illustrated at the
bottom of the drawing.
The material for an earth-ground electrode differs from region to region and may vary
according to conditions present at the site. Consult the National Electrical Code and any local
electrical codes that may apply. The support structure of the display cannot be used as an
earth-ground electrode. The support is generally embedded in concrete, and if it is in earth,
the steel is usually primed or it corrodes, making it a poor ground in either case.
Power Installation
There are two considerations for power installation: installation with ground and neutral
conductors provided, and installation with only a neutral conductor provided. These two
power installations differ slightly, as described in the following paragraphs:
10 Electrical Installation