Daktronics AF-3150-20-R,A - Manual (Page 28)

Figure 21: Installation with only Neutral Conductor Provided
Power Connection
Reference Drawings:
Power Termination Box ............................................... Drawing A-129227
Schematics ...............................................................Refer to Appendix A
Incoming power is connected within the power termination enclosure. Complete the
following steps to terminate the hot and neutral wires at the termination block within
the enclosure. Refer to Drawing A-129227 and the Schematic listed within
Appendix A for your display size.
1. Access the enclosure by removing the left bottom two modules as described
in Section 3.5.
2. Route the power cables through the power conduit in the rear of the sign
and to the enclosure.
3. Connect the white neutral wire to neutral bus.
4. If one power line is being terminated (120VAC), connect the black “hot”
wire to L1. Make sure the jumper from L1 to L2 is in place as shown on
Drawing A-129227.
5. If two power lines are being terminated (120/240VAC). Connect the second
“hot” wire to L2. Make sure to remove the jumper between L1 and L2.
6. Connect the green grounding wire to the grounding bus E41.
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 all power lines can be completely disconnected. Use a 3-conductor
disconnect so both hot lines and the neutral can all be disconnected. The main
disconnect should be mounted at or near the point of power supply connection to the
display. A main disconnect is to be provided for each supply circuit to the display.
The disconnecting means must be located 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: Disconnecting means that are capable of being locked in the open
position may be located elsewhere.
Electrical Installation 3-8