Daktronics BA-515 - Manual (Page 30)

Power Installation
There are two basic 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 cable must contain an isolated earth-ground conductor.
In 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.
Figure 4: Installation with Ground and Neutral Conductor Provided
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
entrance enclosure.
Use a disconnect that opens all of the ungrounded phase conductors.
Bond the neutral and the ground conductors in the display power entrance enclosure.
Figure 5: Installation with Only Neutral Conductor Provided
Electrical Installation 7-2