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TECHNIQUES> CABLE SAG |
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WOLF
BUILDING STANDARDS
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order to keep the cable load within safe parameters, a
minimum amount of 'loaded cable sag' or 'loaded drape'
must be maintained. This amount varies depending
on the type of belay system the course incorporates.
A dynamic belay system will cause more load to the cable
and therefore the sag must be greater than a static belayed
course. As shown above the dynamic course must have
at least a 10% sag and a static course must have a 5%
sag. An element that utilizes both types of belay
must meet the 10% standard. |
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is suggested that belay cables attached to trees should
have extra sag to account for the inevitable growth of
the tree which will tighten the cable reducing the sag. |
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loaded cable sag is impossible to accurately determine
by looking at an unloaded cable. The Sag should be properly tested if there is any doubt about it's tension. In
order to test the loaded sag, a load of at least 200,
but not more that 1,000 pounds is applied to the center
of the cable. A string is pulled tight between the
through bolts or at the level of the cable wrap attachments.
A measurement is made between the level string and the
lowest point in the loaded cable. The measurement
should equal or be greater the 1/10 the distance between
the poles or trees for dynamically belayed elements or
1/20 the distance for statically belayed elements. |
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WOLF
TAKES NO RESPONSIBILITY FOR IMPROPER USE OF THIS INFORMATION.
THIS DOCUMENT DOES NOT REPRESENT A COMPETE PICTURE OF
CABLE INSTALLATION AND USE. IT IS INTENDED AS A REFERENCE
FOR THOSE WHO ARE EXPERIENCED & CERTIFIED WITH ROPES
COURSE CONSTRUCTION AND BELAY TECHNIQUES. THIS
DOCUMENT IS NO SUBSTITUTE FOR PROPER TRAINING AND EXPERIENCE.
THE COMPLETE ACCT STANDARDS MANUAL IS AVAILABLE THROUGH
THE ACCT.
www.acctinfo.org
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