Electro-Voice XLC Touring Addendum
17
3. Rigging Strength Ratings/Safety Factors/Special Considerations
3.2 Structural Rating Overview
For the XLC loudspeaker enclosures there are two independent strength ratings that, together, give a
complete description of the overall structural capabilities of any loudspeaker system; which are:
1.
The strength of each individual enclosure rigging point;
which is the combined strength of
the rigging tube and channel, hinge bars, swing arms, bolts and enclosure.
2.
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.
For the XLC grids, there are also two independent strength ratings that, together, give a complete de-
scription of the overall structural capabilities of the grid; which are:
1.
The strength of each individual grid rigging point;
which is the combined strength of the
rigging tube and channel, hinge bars, swing arms, quick-release pins, bolts, sidearms and spreader
bars.
2.
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.
For the XLC-EB extender beam, there are also two independent strength ratings that, together, give a
complete description of the overall structural capabilities of the beam; which are:
1.
The strength of each individual beam rigging point;
which is the combined strength of the U
channels, yokes, quick-release pins, bolts and chain-link rings.
2.
The total strength of the overall beam;
which is a function of the combined forces from all of
the rigging points acting on the rigging components and the beam as a whole.
WHEN SUSPENDING ANY XLC LOUDSPEAKER ARRAY OVERHEAD, THE WORKING-LOAD
LIMIT MUST NEVER BE EXCEEDED FOR THE INDIVIDUAL ENCLOSURE RIGGING POINT,
FOR THE OVERALL ENCLOSURE, OR FOR ANY OF THE RIGGING ACCESSORIES.
In an XLC system, the forces acting on each loudspeaker system (on each individual rigging point and
on the overall enclosure) and the forces acting on each rigging accessory (grid, coupler beam, extender
beam, etc.) will vary with each array configuration. Determining the forces throughout an array requires
complex mathematical calculations. Electro-Voice engineers have, however, defined a set of simplified
structural-rating guidelines that eliminate the need for the complex calculations for most array configura-
tions. The interaction of the complex forces throughout arrays were analyzed to develop this set of conser-
vative guide-lines, presented below, to enable a rigger to immediately determine on site whether or not an
array is safe without having to make weight-distribution calculations. The structural-strength ratings of the
individual rigging points and the overall XLC enclosures are also presented below so that a complex struc-
tural analysis can be made for any array configuration. The reader should consult an experienced structural
engineer to perform the complex structural analysis.
Содержание XLC 127
Страница 26: ...Electro Voice XLC Touring Addendum 26 5 Notes...
Страница 27: ...Electro Voice XLC Touring Addendum 27 5 Notes...
