Rigging Structural Strength Ratings And Safety Factors; Structural Introduction; Structural Rating Overview - Electro-Voice X1-212/90 Installation Manual

X-LINE ADVANCE Systems
8

Rigging structural strength ratings and safety factors

8.1

Structural introduction

The X1 and X2 loudspeakers systems, grids and accessories were designed as a complete
system to ensure safety and compatibility. The maximum possible number of X1 or X2
loudspeaker systems may be suspended in a single column is 24 while maintaining an 8:1
safety factor. For more information, see Working-load limit and safety factor definitions, page
56.
The actual forces on the rigging components within an array will depend on the specific
configuration of the loudspeakers and grids. The tilt angles of the individual boxes, grids and
the entire array will change the forces in the rigging components throughout an array. Pick
points from the grid, pull backs to the venue, and pull ups to the grid will also affect load
distribution. The result is that the actual maximum number of X1 and X2 systems will be
dependent on the array configuration.
All components are included as part of the Electro-Voice line array prediction software LAPS 3.
The software calculates the forces throughout the array and informs the user of the
limitations. LAPS 3 also reports the loads for the pick points going to the venue.
8.2

Structural rating overview

Designing a safe structural array is a very complex process best left to experienced
professionals. There are two (2) independent strength considerations, together, that give a
complete description of the overall structural capabilities of any loudspeaker system; these
are:
1.
2.
For grids, there are two (2) independent strength considerations, together, give a complete
description of the overall structural capabilities of the grid; these are:
1.
2.
In any system loudspeaker array, the forces acting on each loudspeaker system (on each
individual rigging points and on the overall enclosure) and the forces acting on each grid
rigging accessory (on each sidearm and spreader bar and on the overall grid grids and
spreader bars) vary varies with each array configuration. Determining those forces throughout
an array requires complex mathematical calculations.
To make the X1 and X2 systems both safe and easy to use, Electro-Voice engineers have built
calculations into the LAPS 3 software, enabling a user to immediately determine if an array is
safe without having to do a complex structural analysis.
2015.04 | 02 | F.01U.310.953
The strength of each individual enclosure rigging point; which is the combined strength of
the rigging tube, hinge bars, link bars, quick-release rigging pins internal rigging straps,
external tie plates, bolts, and enclosure.
The total strength of the overall array; which is a function of the combined forces from all
of the rigging points acting on the rigging components and the array as a whole.
The strength of each individual grid rigging point; which is the combined strength of the
bolts, grid side arms, and spreader bars, and quick-release pins.
The total strength of the overall grid; which is a function of the combined forces from all
of the rigging points acting on the rigging components, and the grid as a whole.
Installation Manual Electro-Voice