Laps 3 Structural Evaluations Simplified Structural Rating Guidelines; Specific Safety Considerations - Electro-Voice X1-212/90 Installation Manual

8.3 LAPS 3 structural evaluations simplified structural rating
guidelines
Using a combination of computer modeling, destructive and non-destructive testing, Electro-
Voice engineers have developed calculations to determine the forces within an array that act
on the loudspeaker systems and grid rigging accessories. The results of these calculations are
compared to the working-load limits of each loudspeaker and grid element, and their
individual components.
LAPS 3 will take into account all the complex factors to ensure that an array is strong enough
to maintain an 8:1 safety factor. If a particular array designed by a user exceeds a working-load
limit, the software will return warning messages. The messages will provide information
describing what is causing the overload, and will offer suggestions to the user for changes that
can be made to the array to eliminate the overload. The user can then decide the best solution
for their particular application.
LAPS 3 will also report the loads on the rigging pick points (typically hoist motors) that
suspend the array from the venue. The software assumes that these rigging points are plumb
vertical. The user must calculate the increased tension in the suspension lines if they are
angled.
Caution!
The user should never apply a load that exceeds the working-load limits of any of the rigging
!
components or complete loudspeaker systems described in this manual.
The user should never exceed the safety limitations reported by LAPS 3 or higher.
8.4

Specific safety considerations

X1 and X2 loudspeaker systems
The X1 and X2 loudspeaker systems must only be suspended using the Electro-Voice grids.
The X12TC-GRID and X12TE-GRID should be used as top grids. For a pull back to a venue or a
pull up to grid, the X12PU-BGK may be used as the bottom grid. For an extreme down angle,
the X12TC-GRID may also be used at the bottom.
The X1 and X2 rigging and grids were designed to be tilted up or down (front to back tilt).
However, they are not intended to hang sideways. Columns of X1 or X2 loudspeaker systems
must never be angled off be hanging plumb vertical ±5°.
X12TC-GRID and X12TE-GRID top grids
The X12TC-GRID and X12TE-GRID top grids may be suspended using one (1) or two (2)
spreader bars. Additionally, one (1) or two (2) pick points may be used with the spreader
bars.
When multiple pick points are used to suspend the grids from a venue roof, LAPS 3 calculates
the loads on the pick points assuming that the suspension lines are plumb vertical. If the lines
are angled, the loads will be increased on both the grid and hoist motors and building
Electro-Voice Installation Manual
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2015.04 | 02 | F.01U.310.953