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6.0 Rigging-Strength Ratings and Safety Factors (cont')
WHEN APPLYING THE STRUCTURAL RATING GUIDELINES TO ANY EVA LOUDSPEAKER
SYSTEM SUSPENDED OVERHEAD, THE USER MUST OBEY THE FOLLOWING RULES:
1.
Never exceed 720 lb (327 kg) total column weight of suspended loudspeakers, accesso-
ries and cabling. (Typically 8 EVA 2082S modules)
2.
If a second grid is used at the bottom of the array, the angle between the suspension lines
must never be allowed to exceed 60° as shown in Figure 18. Do not use EVA-EG grids
in this application!
3.
The suspended column must be perpendicular (plumb) to within +/- 5 degrees as shown in
Figure 20.
4.
If a spreader bar is suspended from two points, the angle between those two suspension
lines must not exceed 60 degrees (Maximum 30 degrees from plumb each) as shown in
Figures 21 and 22.
5.
Never attempt to suspend EVA systems overhead by any other method than the
use of EVA-SG or EVA-EG grids and spreader bars as outlined in this manual.
28
Side-to-side simplified structural-rating guidelines for
EVA arrays (angle shown exaggerated for illustration purposes)
Figure 20:
Electro-Voice® EVA Series User Manual
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