Disclaimer: The ETC Safety cable P/N 7060A1022, is to be used as a safety device for ETC lighting fixtures only. It should not be used for rigging or lifting any items or people and should not be used under tension.
even the big wiggly ones.
I have never seen a safety cable rated for overhead lifting.
Haven't we agreed that "overhead lifting" applies to things that move?
Here's what I teach:
For conventionals, single wrap, enough slack to focus any direction.
For movers, double wrap, and/or as little slack as is practical, to shorten shock load distance.
A twelve pound Leko falling one foot may not exert much shock load, but a fifty pound mover might.
While not proud of it, I've used lighting safeties to hang fast-fold screens, provided they're in good condition and the clips are working properly. Beats tieline. Or zip ties.
Putting on my stupid hat here. I don’t think I have seen this discussed.
If a clamp failed catastrophically, it seems there would be a shock load on the safety that could apply more force than the clip could handle.
Is there any data that supports a double wrap of the safety for heavier fixtures? If so is there a definition of heavy enough to double wrap?
By double wrap I mean go twice around the pipe/yoke so the shock load would be reduced.
Properly swaged aircraft with verlocks?
I noticed lighting safetys are swaged differntly than normally would on aircraft cables.
Reason?
I totally agree with that main use of a lighting safety and only use it for that purpose but to debate
" rules that are acceptable to be broken "
I read tests have shown that lighting safetys on a straight pull will break ~ 1500lbs (5:1 ~300lbs)
and in basket it breaks at ~2900lbs (5:1 ~590lbs)
So if the object to be hung is within those numbers can it be argued that it is okay to to hang of safetys.
How to calculate shockload?
Sure. Imagine if the safety cable was a giant rubber band that could stretch out four or five feet before the fixture gradually came to a complete stop. Less shock, no? Same principle as shock-absorbing fall protection.Stopping distance small = more shockload?
Sure. Imagine if the safety cable was a giant rubber band that could stretch out four or five feet before the fixture gradually came to a complete stop. Less shock, no? Same principle as shock-absorbing fall protection.
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