Daktronics CH-1018H - Manual (Page 7)

Installation 2-1
Section 2: Mechanical/Electrical Installation
2.1 General System
Reference Drawings: Driver Enclosure, Power & Signal ............... Drawing A-37915
Mounting Instructions .................................. Drawing A-38856
Color Code, 25-Pin J-Box ........................... Drawing A-47207
System Layout, CH-1018H ......................... Drawing A-51505
Component Locations, CH-1018H .............. Drawing A-51511
Electrical Installation, CH-1018H ................ Drawing A-51519
Footing & Beams, CH-1018H...................... Drawing A-51520
Refer to Drawing A-51505 for a general system layout.
The general procedure for installing the CH-1018H 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.
4. Mount the displays to the beams as described in Section 2.3 and Drawings A-38856 and
A-51520.
5. Route power and signal wires into the displays as described in Section 2.4 and Drawings
A-37915, A-47207, A-51511, and A-51519.
2.2 Beam and Footing Selection
Reference Drawing: Footing and Beams, CH-1018H .................... Drawing A-51520
The table below contains recommendations for W-shape beams and footings to support the
display as shown in Drawing A-51520. 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.