Daktronics AB-1600-1.5,2.5 - Manual (Page 17)

Electrical Installation
3-1
Section 3 : Electrical Installation
3.1
Grounding
Proper grounding is necessary for reliable equipment operation. It also protects the
equipment from electrical disturbances and lightning. If the following grounding methods are
not adhered to, the warranty will be void.
, , , , Displays MUST be grounded according to the provisions in Article 250 of the National
Electrical Code.
The steel support structure for the display cannot be used as grounding. The support is
generally imbedded in concrete, and if it is in earth, the steel is either primed or it corrodes,
making it a poor ground.
The two considerations for power installations, new power installations and existing power
installations, differ slightly.
i i i i
Note: Requirements for surge protection are the sole responsibility of the customer!
3.1.1. New Power Installations
Figure 2 illustrates the proper power and grounding installation showing an earth
ground conductor from the power source. This method should be used whenever a
new installation needs to be done for a display.
Note that this installation shows an earth ground conductor from the first point of
disconnect or power source to the display location. The earth ground conductor must
then be tied securely to the display cabinet via the load center or in some cases
directly to the cabinet. Another conductor is then run from this termination to a
copper earth ground rod, making certain that the termination to the ground rod is
secure. This termination should be made with a brass or copper connection.
The earth ground rod should be the diameter and length appropriate for the local
electrical code. The earth ground conductor should be of the same size as the line
and neutral conductors or no less
than one size under these
conductors.
Figure 2: New Power Installation