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X-LINE ADVANCE System Rigging & Transport
Figure 10.1: Double pick point maximum angle
X12PU-BGK and X12-125FPU-BGK bottom pull-up grid
The X12PU-BGK and X12-125FPU-BGK bottom grids were 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°.
Line array configuration software reports the tension required to pull the rear rigging of the
loudspeaker enclosures into compression when the X12PU-BGK is used with theX12TE-GRID
and the X12-125FPU-BGK is used with the X12-125F-GRID. Never exceed the tension reported
by Electro-Voice line array configuration software.
Line array configuration software calculates the loads on the X12PU-BGK and X12-125FPU-
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 and X12-125FPU-BGK are intended to be used as bottom grids for pull-up
applications only. Never use X12PU-BGK or X12-125FPU-BGK as a top grid.
10.5
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 working-load limit (WLL) or the ultimate-break strength. Electro-Voice
chooses to present the structural-load ratings 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, X2 and X12-125F 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. However, the user
should never apply a load to that part that exceeds 1,000 lb (454 kg). The safety factor
provides a margin of safety above the working-load limit to accommodate normal dynamic
loading and normal wear.
Cautions for working-load limits and safety factors
The working-load limits defined by the manufacturer of any rigging component should never
be exceeded. Electro-Voice bases the working-load limits of its X1, X2 and X12-125F products
on a minimum of an 8:1 safety factor. Other manufacturers of rigging components may base
Electro-Voice
X12
TE GRID
-
Installation manual
Rigging structural strength ratings and safety factors | en
PICK HERE
X2
THIS SIDE
TO REAR
Spreader bar
SAFETY
HERE
X1
THIS SIDE
TO FRONT
2019-07 | 04 | F.01U.310.953
71
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