Daktronics AB-1600-1.5,2.5 - Manual (Page 28)

3-6 Electrical Installation
The following subsections address the routing of incoming power through a power disconnect switch
and the termination of incoming power at the display’s power termination panel. Daktronics completes
all power routing and connection within the display past the power termination panel prior to
shipment.
When terminating the incoming power to the term panel, balance the individual power phases as
evenly as possible. Current draw per line, as noted on the sales literature or schematic, is the high leg
current draw.
For a 2V display, bring power into both faces. The termination panel for the echo face is located in the
right end of the display. Connect power as stated above.
Power Disconnect Switch
Route power to the display through a fused disconnect switch capable of opening all ungrounded
power conductors. Locate this disconnect within the line of sight of any personnel performing
maintenance on the display. If locating the disconnect out of sight of the display, it must be able to
lock in the open position.
Due to the inrush current (momentary surge) created by the display on start-up, Daktronics
recommends using oversized current devices, high magnetic breakers or time delay fuses to
handle the momentary surge.
The Over Current Protection Device needs to match the fault current available in the power
delivery circuit. To determine the available fault current of circuit, have qualified personnel
perform an onsite fault current survey at the site.
The National Electrical Code requires the Amp Inrush Current (AIC) rating of the electrical
equipment in a circuit match the available fault current in the electrical circuit.
Because each installation is unique, Daktronics offers these instructions as guidelines only.
Daktronics assumes no liability if installation steps have been omitted or other necessary
procedures are not included in this manual.
Daktronics is not responsible for the quality of the power delivery system to the display. It is the
customer’s responsibility to ensure the undertaking of proper safety measures. Power and
signal wiring in the display must comply with local, state and national electrical codes, with the
correct cabling procedures for the installation determined and followed.
Power Termination at the Display
Incoming power connects to the power termination panel located within the left end of display.
Drawing A-113974 shows an example of a power termination layout. The appearance of other
termination panels will vary by sign size.
Complete the following steps to connect power to the termination panel.
1. Pull the power cable from the conduit to the termination panel.
2. Connect the white neutral wire (or wires) to the position labeled NEUT on TB41.
3. If terminating 120/240 single-phase power, connect the hot wires to the positions labeled L1
and L2 on TB41. If terminating 120/208 three-phase power, connect the hot wires to L1, L2
and L3 on TB41.
4. Apply a silicone sealant around the conduit where it meets the cabinet to prevent
water/moisture from entering the display.