Daktronics DF-1030 - Manual (Page 19)

Electrical Installation 3-3
Grounding
Reference Drawings:
Schematic; Multipurpose 4 Col. LED Drvr ................... Drawing A-165028
Schematic; 16 Col Multipurpose LED Drvr .................. Drawing A-179599
Enclosed Driver, 4 Col. Reference............................... Drawing A-184918
Displays MUST be grounded according to the provisions outlined in Article 250 of
the National Electrical Code and according to the specifications in this manual.
Daktronics requires a resistance-to-ground of 10 ohms or less.
The contractor performing the electrical installation can 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-184918, for
information on where to connect the earth-ground electrode. 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:
Installation with Ground and Neutral Conductors Provided. For this type of
installation, the power circuit must contain an isolated earth-ground conductor.
Under this circumstance, do not connect neutral to ground at the disconnect or at the
display. This would violate electrical codes and void the warranty. Use a disconnect
so that all hot lines and neutral can be disconnected. The National Electrical Code
requires the use of a lockable power disconnect within sight of or at the display.
Installation with Only a Neutral Conductor Provided. Installations where no
grounding conductor is provided must comply with Article 250-32 of the National
Electrical Code. If the installation in question meets all of the requirements of Article
250-32, the following guidelines must be observed:
• Connect the grounding electrode cable at the local disconnect, never at the
display driver/power enclosure.
• Use a disconnect that opens all of the ungrounded phase conductors.