Daktronics BA-515 - Manual (Page 31)

Electrical Installation
7-3
The scoreboard must be connected to earth ground. Proper grounding is necessary for reliable
equipment operation. It also serves to provide protection to the equipment against damaging electrical
disturbances and lightning. Failure to adhere to the following grounding methods will void the
warranty.
The steel support structure for the scoreboard cannot be used as grounding. The support is generally
embedded in concrete, and if in earth, the steel is either primed or it corrodes, making it a poor ground.
Use one ground electrode (typically, a ground rod) at each scoreboard support column.
The power cable must contain a separate earth-ground conductor. When a separate ground conductor
is used, do not connect neutral to ground at the disconnect or at the scoreboard. To do so would violate
electrical codes and void the warranty. Refer to Figure 5.
The National Electrical Code requires the use of a lockable power disconnect near the scoreboard. The
customer must provide a lockable disconnect switch (knife switch) at the scoreboard location so that
all power lines can be completely disconnected. Use a multi-conductor disconnect so that all hot lines
and the neutral can all be disconnected. This is important in protecting the scoreboard against
lightning.
K Note: Do not connect ground to neutral at the scoreboard. Doing so voids the warranty and may
violate electrical codes.
7.2 Power and Signal Connection
Reference Drawings:
Components 8/16 Pos Power and Signal Entrance .............................. Drawing A-109114
Components 2/4 Pos Power and Signal Entrance ................................ Drawing A-125977
To gain access to the entrance panel, open the access door and remove the cover from the entrance
enclosure. Refer to Section 4: Component Locations for the location of the access door for the model
of your scoreboard.
Connect the power and signal cables to the entrance panel as shown in Drawings A-109114 and A-
125977.