I see that we are using these big fat tether/lineman's ropes. I'm looking at these prussic knots (supplied by Tethrd, New Tribe, HSS, etc.) and its striking me that it looks like that skinny little prussic cord, going 1x around the 'biner is really where the rubber meets the road. So it engenders these questions: Am I mistaken or is that not the weakest link ? And if that is the case, are we just using these huge ropes because they handle well for our purposes? I'm fine with that... just wondering.
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Big fat tether..tiny prussic
- Thread starter bow shot
- Start date
To grab correctly the prussic should ideally be 3mm smaller than the line it is wrapped around. Most are using 8mm prussic since it, as you correctly pointed out, is the limiting cordage. That makes the tether an 11mm rope minimum if your attaching with a prussic.
Cbinderjr
Well-Known Member
Could be wrong but I dont think it's the weakest link, 8mm accessory cord is rated around 3500lbs in a end to end fashion since the rope is wrapped around main line and you are connected to both ends of the rope the load rating is increased quite a bit because your load is distributed to 2 both sides of the rope.
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patriotoutlaw
Well-Known Member
8mm prussic on an 11mm rope. There is no weak link in that set up for what we are dealing with, here.
hmm. My lineman's measure 0.5" (12.7mm) and prussic rope measure 0.25" (6.35mm) cord relaxed. 0.45 (11.43mm) and 0.23 (5.84mm) respectively, cord stretched. Measured with a dial caliper barely gracing the cross sections at various places, on straight sections of relaxed cord. I'll fiddle around with this. Not a big deal, I'm sure, more of a point of curiosity.
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I once asked the same question, and the answer I got is that you should still have the end of your lineman belt connected to your carabiner, that way if your prussik did fail, you would still have the full rating of your rope to protect you from a fall. Use the prussik for adjustments, but your rope connected on both ends for safety.
Everybody should do this...period
From the testing I've read friction hitches will slip before the cord breaks. I'll see if I can dig up some of those later.