Daktronics CH-1421V - Manual (Page 7)

Installation 2-1
Section 2 : Installation
2.1 General System
Reference Drawings: Driver Enclosure, Power & Signal ............... Drawing A-37915
System Layout ............................................ Drawing A-38865
Power wiring and grounding ....................... Drawing A-45220
Color Code, 25-Pin J-Box ........................... Drawing A-47207
Shop Dwg, Mounting Details....................... Drawing A-49278
Component Numbering, CH-1421V .......... Drawing A-106020
An illustration of the overall system layout for the CH-1421V is shown in Drawing A-38865.
A typical installation depicting beams, footings, and wiring conduit is illustrated in Drawing
A-49278. The general procedure for installing the CH-1421V display is as follows:
1. Select beam and footing recommendations from the table below.
2. Dig the footing holes and install beams and footings.
3. Route power and signal cables to the display and control locations as described in Section
2.4.
4. Mount the display to the beams as described in Drawing A-49278.
5. Route power and signal wires into the display as described in Drawings A-37915, A-
38865, A-45220, A-47207, and A-106020.
2.2 General System
Reference Drawing: Shop Dwg, Mounting Details ......................... Drawing A-49278
The table below contains recommendations for W-shape beams and footings to support the
display. Refer to Drawing A-49278. The first column is wind velocity in miles per hour.
The distance in the second column is from the ground to the bottom of the display. The
choice from these columns depends upon the display location.
The beams listed below are beams which provide maximum wind load strength for the weight
and cost of the beams.
Wind
Speed
Height
(ft)
Beam
Section
Footing
Depth x Dia.
70 mph 10 W8 x 15 4 ¾ ft x 3 ft
15 W6 x 20 5 ½ ft x 3 ft
80 mph 10 W8 x 15 5 ½ ft x 3 ft
15 W8 x 20 6 ¾ ft x 3 ft
90 mph 10 W8 x 17 6 ¼ ft x 3 ft
15 W8 x 24 7 ft x 3 ft
The calculations for footing diameters and depths are based on the assumption that footings
are in undisturbed soils, not fill soils. Lateral bearing capacity of 300 psf per foot of depth in
natural grade was used to derive these figures.
The footings recommendations are based on the allowable soil bearing pressure of 3000 psf
vertically and 300 psf/ft of depth horizontally. However, these recommendations are
suggestions only and soil bearing pressure at the site must be determined by a sample test