Martin MAC One VDO Grid Mount System Sicherheits- Und Installationshinweise Seite 9

Protection from injury caused by wind pressure
Wind can create a risk of serious or lethal injury and damage due to falling fixtures or other
equipment. In any location where a VDO Grid Mount System is mounted that may be
exposed to wind pressure or other air currents, take the following precautions:
•
Support the VDO Grid Mount System using a structure that is capable of holding the
cells securely without any safety risk when cells are exposed to wind pressure.
•
Secure the VDO Grid Mount System against any swinging, snaking or other lateral
movement that might occur when system is exposed to wind pressure. Fasten system
to anchor points as directed in this user manual.
•
Ensure that professional technicians constantly monitor weather forecasts and local
wind speed at the installation site and that the instructions for installation in this
manual are followed correctly. In a flying installation where a VDO Grid Mount System
is suspended overhead, technicians must disassemble the system immediately if
constant or gusting wind speed that exceeds Force 8 Beaufort, 20 m/s or 45 mph is
forecast for, or present at, the installation location.
Safety precautions for flying installations
Respect the following precautions when installing an array of MAC One VDO Grid Mount
System cells hanging from the MAC One VDO Dual Header or MAC One Single VDO
Adapter suspension system:
•
Respect the maximum limits given in this user manual for the number of MAC One
VDO Grid Mount System cells (Grid Mount Rings with fixtures installed in them) that
you can suspend vertically. The maximum limit varies depending on installation type.
Ensure that you respect the limit that applies to the installation concerned.
•
Ensure that each separate item of rigging hardware (chain, cable, shackle, etc.) can
hold at least six (6) times the total weight of the Dual VDO Header or Single VDO
Adapter, fixtures, hardware, cables etc. that are suspended under that item. For
example, if a Dual VDO Header and all the fixtures, hardware, cables etc. hanging
from it weigh 100 kg (221 lbs.) in total, each item that is used to suspend that 100 kg
load must be capable of supporting 600 kg (1326 lbs.). The requirement also applies
regardless of whether a Dual VDO Header is supported by one, two or three chains or
cables: if the 100 kg load in the example above is suspended from three chains, then
each chain must be capable of supporting 600 kg.
•
Ensure that each eyebolt used to suspend or secure a column of cells is fastened to
the supporting structure with its own cable or chain. Do not loop one cable or one
chain through more than one eyebolt.
•
Start by installing Dual VDO Headers or Single VDO adapters. Then install MAC One
VDO Grid Mount System cells at the top and work downwards.
•
Ensure that there is no slack in any item of rigging hardware: all cables, chains etc.
used for suspension must be equally tight and aligned.
•
Disassemble a suspended installation by removing cells at the bottom and working
upwards. Do not remove Dual VDO Headers until all cells have been removed.
•
In an overhead installation, use a minimum of two interconnected MAC One VDO Grid
Mount cells. Do not use one VDO Grid Mount cell alone.
•
Ensure that all rigging hardware items (rigging clamps, omega brackets etc.) are in
perfect condition, are approved by a professional body such as TÜV for the weight
that they will support, and that they comply with all locally applicable regulations.
MAC One VDO Grid Mount System Safety and Installation Manual, Rev. A 9