Daktronics AF-3197-89-RGB - Manual (Page 30)

Electrical Installation 3-8
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Power Installation
There are two considerations for power installation: installation with ground and
neutral conductors provided and installation with only a neutral conductor provided.
For these displays, installation with ground and neutral conductors provided is used.
Installation with Ground and Neutral Conducto s Provided
For this type of installation, the power cable 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.
3.7 Main Disconnect
The National Electrical Code requires the use of a lockable power disconnect near
the display. Provide a lockable disconnect switch (knife switch) at the display
location so that all power lines can be completely disconnected. Use a 3-conductor
disconnect to disconnect both the hot lines and the neutral. Mount the main
disconnect at or near the point of power supply connection to the display. Provide a
main disconnect for each supply circuit to the display.
You must locate the means of disconnection in a direct line-of-sight from the display
or outline lighting that it controls. This requirement provides protection by enabling
a worker to keep the disconnecting means within view while working on the display.
Exception: You may locate the disconnecting means that are capable of being
locked in the open position elsewhere.