Please see the following, from Control Booth's TOS: "The users of ControlBooth, in a effort to police themselves, have evolved the following: No discussion of "how-to" of rigging, pyrotechnics, and electrical will be permitted. Our stock answer to these questions is always "Consult a qualified professional."
I will have to look for that again. I've searched several sites researching. But from the sounds of it this site was misleading and wrong.
Thats daring joining a site then saying that there info is misleading and wrong.
Also using turn buckles are extremely dangerous, many people use them so they can "tweak" the sides to get them even, but i have seen them work themselves loose and send things flying down.
Also we use steel safetys where ever span sets are used (you should always be sure that any company you higher in does this) so in the event of a fire the span sets will melt and the steel safetys will take the load, saving your rig from falling on people and fire fighters.
I believe that steel cable from hardware stores is not rated for overhead lifting.
Maybe I wasn't clear. It was the beam that melted the spanset, not the heat from the spanset touching the instrument. It had been an intentional test to show that light itself can cause failures in rigging. Then again, in HS, we would hang scoops as a pizza warmers when doing an after party. It's the same thing they do in the fast food chains (well, they don't use scoops, but light energy is the same).you should never put a conventional around a spanset where it can potentially melt it, as a rule of thumb.
I am thankful that our local hardware store sells rigging supplies, such as shackles and spansets large enough to hoist a cement truck .
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