Daktronics AF-3400-64-R,A - Manual (Page 25)

Figure 16: Power Termination Box
5. Make the following connections as shown in Figure 16 for a three phase
display:
120/208 (Four wires plus Ground)
TB41 1 Phase A
2 Phase B
3 Phase C
4 Neutral
E41 Ground
6. Power needs to be connected to all display faces.
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 disconnect to
disconnect 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.
Electrical Installation 3-7