Telex ELECTRO-VOICE X-Line TM User Manual

Page 31

ELECTRO-VOICE

X-Line

Rigging Manual

3.4 Complex Structural-Rating Analysis

For a complete structural-rating analysis, the forces in each individual piece of rigging hardware

throughout the X-Line system must be determined, as well as the forces on each enclosure.

Determining these forces requires complex mathematical calculations. All of these forces must

then be compared to the working-load limits detailed below for each of the rigging points and the

overall enclosures. The reader should consult an experienced structural engineer to perform the

complex structural analysis.

WHEN SUSPENDING ANY X-LINE LOUDSPEAKER SYSTEM OVERHEAD, THE

WORKING-LOAD LIMITS MUST NEVER BE EXCEEDED FOR EACH INDIVIDUAL

RIGGING POINT, AND THE OVERALL ENCLOSURE.

Xvls, Xvlt, Xsub, Xfil1 and Xfil2 Rear Rigging Structural-Strength Ratings:

The working-load limit of each individual rigging point on the rear of an X-Line enclosure is

dependent upon the rigging-track/bracket assembly as it is mounted in the enclosure, the specific

removable rigging-hardware assembly and the angle of pull. The structural-strength ratings for

individual Xvhg grid hinges and Xvhp pick-up hinges are shown in Figure 12, while the structural

ratings for the Xvhl linking hinges are shown in Figure 13.

It should be noted that the front-to-back angle range shown in Figure 12 is only 270° for the Xvhg

and Xvhp because the hinge chains can only be put into tension and the enclosure prevents a full

360° rotation. It also should be noted that all of the hinges are only rated for use over side-to-side

pull angles of a maximum of ±5°, as shown in Figure 12. There are two rigging points at the rear

of the enclosures. The structural ratings shown in Figure 12 are for a single rigging attachment

point. Each rigging point has the same rating.

The front-to-back structural-strength ratings for the Xvhl linking hinges shown in Figure 13 cover a

full 360° rotation. Although it is not possible to put the hinge into tension over 360°, it is possible

for the linking hinges to go into compression when pull-up straps are employed. Therefore, the

360° rating is necessary to accommodate both tension and compression. It also should be noted

that the Xvhl linking hinges are only rated for use over side-to-side pull angles of a maximum of

±5° as shown in Figure 13. There are two rigging points at the rear of the enclosures. The

structural ratings shown in Figure 13 are for a single rigging attachment point. Each rigging point

has the same rating.