supports. The user is responsible for determining the resulting increased loads. When
suspending the X12TC-GRID and X12TE-GRID top grids with multiple pick points, the pick
lines must be plumb vertical ±30°.
Figure 8.1: Double pick point maximum angle
X12PU-BGK bottom pull-up grid
The X12PU-BGK bottom grid was designed to have a pick angle that varies front to back (for
tilting an array down, but was not intended for side pulls. The X12PU-BGK is only rated over
side-to-side pull angles of ±5°.
LAPS 3 reports the tension required to pull the rear rigging of the loudspeaker enclosures into
compression when the X12PU-BGK is used with the X12TE-GRID. Never exceed the tension
reported by LAPS 3.
LAPS 3 calculates the loads on the X12PU-BGK when used as a pull up/back to the venue
assuming that the suspension lines are plumb vertical. If the line is not vertical, the loads will
be different than the calculated value. The user is responsible for determining the load when
not vertical.
The X12PU-BGK is intended to be used as a bottom grid for pull-up applications only. Never
use the X12PU-BGK as a top grid.
Working-load limit and safety factor definitions
The structural ratings for all of the X-Line Advance series rigging components and complete
loudspeaker systems are based on test results in which parts were stressed to failure.
Manufacturers typically present the structural-strength ratings of mechanical components or
systems as either the WLL (working-load limit) or the ultimate-break strength. Electro-Voice
chooses to present the structural-load ratings of the X1/X2 loudspeaker systems as the
working-load limit. The working-load-limit rating represents the maximum allowable load to be
applied to a mechanical component or system.
The working-load limits for the X1 and X2 loudspeakers systems, grids, accessories and
complete arrays described in this manual are based on a minimum 8:1 safety factor. The safety
factor is defined as the ratio of the ultimate-break strength divided by the working-load limit,
where the ultimate-break strength represents the force at which a part structurally fails. For
example, if a part has a working-load limit of 1,000 lb (454 kg), it would not structurally fail
until a force of at least 8,000 lb (3,629 kg) was applied, based on an 8:1 safety factor.
8.5
X-LINE ADVANCE Systems
2015.04 | 02 | F.01U.310.953
Installation Manual
Electro-Voice
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