Daktronics BA-1018, Installation, Maintenance, And Specifications Manual, Page: 29 / 144

Electrical Installation
Section 7: Electrical Installation
Reference Drawings:
Components 8/16 Pos Power and Signal Entrance .............................. Drawing A-109114
Components 2/4 Pos Power and Signal Entrance ................................ Drawing A-125977
Electrical installation consists of:
Providing power and ground to a disconnect near the scoreboard.
Routing power and ground from the main disconnect to the scoreboard power and signal
entrance enclosure.
Connecting the scoreboard ground to a grounding electrode at the scoreboard location.
Routing the control signal cable from the control location to the scoreboard location.
Connecting several cables from the lower to the upper section.
Route power and signal cables into the scoreboard from the rear. There are two knockouts for conduit
connection in the back. All wires connect to the entrance plate.
Drawings A-109114 and A-125977
illustrate the two types of entrance panels.
7.1 Power Requirements
Reference Drawings:
Components 8/16 Pos Power and Signal Entrance .............................. Drawing A-109114
Components 2/4 Pos Power and Signal Entrance ................................ Drawing A-125977
Refer to the chart in
Section 3 to determine circuit specifications and maximum power requirements
for the models described in this manual.
Daktronics outdoor scoreboards have been designed for easy access to components, and the power and
control signal hookup has been simplified. Front panels are removable to allow access to the digits,
cabling and other electronic components.
Proper power installation is imperative for proper display operation. The following subsections give
details of display power installation.
Grounding
Displays MUST be grounded according to the provisions outlined in Article 250 of the
National Electrical Code
®
. Daktronics recommends a resistance to ground of 10 ohms or less.
The display system
must be connected to earth-ground. 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.
The material of an earth-ground electrode differs from region to region and from 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 in earth, the steel is either primed or it corrodes,
making it a poor ground.
7-1