<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Ford. I did not see your post but caught up with it in Steven’s response.<div><br></div><div>Working Load Limits (WLL)* in the US are determined by the manufacturer and are sometimes set by Standard, sometime not. The typical WLL used by hardware manufacturers is 5:1 although the shackle folks, particularly those who sell to the entertainment industry, use 6:1, 7:1 and in some cases, 8:1.</div><div><br></div><div>Performer flying companies tend to hover (sorry) around 10:1 but not all the time.</div><div><br></div><div>Soooooo, the answer really is…it depends. And what it depends on more often than not is your level of comfort.</div><div><br></div><div>Personally, I liked the old tried and true 7:1 simply because theatre folks deal in 1/4” Ø GAC and the breaking strength of 1/4” Ø GAC is always right around 7,000 pounds. So using 7:1 means the math is real easy. You’ll be hard pressed to find someone who tells you the WLL of 1/4” Ø GAC is something other than 1,000 pounds.</div><div><br></div><div>*most industries have moved away from SWL and are using WLL</div><div><br></div><div>zat help?</div><div><br></div><div><div apple-content-edited="true">
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<br><div><div>On Apr 22, 2015, at 5:20 PM, Steven Hood via Stagecraft <<a href="mailto:stagecraft@theatrical.net">stagecraft@theatrical.net</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Me, of German descent, vote at least 5:1, but would prefer 8:1 for WLL.<br>Steven R Hood<br>310.756.3555<br><br><br><br>On April 22, 2015 2:12:55 PM Ford Sellers via Stagecraft <<a href="mailto:stagecraft@theatrical.net">stagecraft@theatrical.net</a>> wrote:<br><br><blockquote type="cite">Hi All,<br>I tried sending this message yesterday, twice.<br>I never saw it post, so I'm resending...<br><br>I am having some items destructively load tested, and have a question.<br><br>Once I discover the load at which the item breaks, what is the ratio I should use for SWL?<br><br>For instance, if the product is loaded to 2000kg before showing deformation, would I use a 3:1 or 5:1 or greater ratio to determine SWL?<br><br>Are there different standards for different markets? I know the Germans (for instance) are extremely conservative in their ratings, whereas I have heard that in the USA and Canada, ratios of 3:1 and 5:1 are common.<br><br>Thanks in advance,<br><br>Ford Sellers<br>Senior Product Development Manager<br>Chauvet Professional Lighting & Iluminarc<br>5200 NW 108th ave<br>Sunrise, FL 33351<br>Phone: 800-762-1084<br>Fax: 800-544-4898<br><br><br>____________________________________________________________<br>For list information see <<a href="http://stagecraft.theprices.net/">http://stagecraft.theprices.net/</a>><br>Stagecraft mailing list<br><a href="mailto:Stagecraft@theatrical.net">Stagecraft@theatrical.net</a><br>http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net<br></blockquote><br><br><br>____________________________________________________________<br>For list information see <<a href="http://stagecraft.theprices.net/">http://stagecraft.theprices.net/</a>><br>Stagecraft mailing list<br><a href="mailto:Stagecraft@theatrical.net">Stagecraft@theatrical.net</a><br>http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net<br></blockquote></div><br></div></body></html>