OH this is the fun of asking for advice. I've been pulling wire, fiber and
ducting in the field for 25 years. The 'best' device is the kellums 'finger
cuff' kind of grip. We use them with a swivel head for fiber optic cables
to avoid twist, but the regular ones without the swivel are fine for most
runs. How much work you put into this depends on how much how much you have
to pull. I've watched folks take extreme care in making up that head,
stripping each wire and doubling them over, wrapping the head with baling
wire, etc. If you are pulling with a winch or 'tugger' putting 1000 pounds
or pressure on it, you need this type of head. If you are just dragging it
by hand through a pipe, different story.
The Prussic knot is wonderful, but this is the wrong application. The
Prussic know functions by putting pressure on the product and 'kinking' it
to get a grip. Generally, the prussic depends on the product being slack
below the knot to allow the 'kink' to be put in the line and get a grip.
I've used them for climbing, rescue work and sailing. They are a great
knot, just...not for this purpose. A clove hitch or half hitch is a
'hitch', designed for this purpose.
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Rex Lint
> Sent: Wednesday, April 15, 2009 9:40 AM
> To: 'Daron Wilson'; 'Glenn Thorne'
> Cc: 'Tower Talk'
> Subject: Re: [TowerTalk] Pull ropes in buried PVC
>
> A better knot than half-hitches for such a task is the PRUSSIC. With
> either
> the prussic or half hitches, rather than the "finger trap" approach,
> you
> have a part of the cable in front of the knot, being pushed, instead of
> pulled, and it's liable to hang up if it meeds an obstacle.
>
> http://www.survivaltopics.com/survival/how-to-make-a-prusik-knot/
>
> -Rex-
>
> Rex Lint, Consultant
> 26 Brek Drive
> Merrimack, NH 03054
> PH: 603-860-7651
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Daron Wilson
> Sent: Tuesday, April 14, 2009 11:18 PM
> To: 'Glenn Thorne'
> Cc: 'Tower Talk'
> Subject: Re: [TowerTalk] Pull ropes in buried PVC
>
> The question is how to make the 'head', the interface of the pulling
> rope to
> the product. The simplest commercial way is a cable grip, a device
> made of
> steel wire much like the 'chinese finger cuff' kind of thing, you slip
> it
> over the cable, pull it tight and wrap with tape. Andrew makes a
> hoisting
> grip for various sizes of cables that laces up the side, so you can
> slip it
> around existing cables and then unlace it when they are in place.
>
> The less expensive way is a few half hitches around the coax, then wrap
> the
> head with tape and pull it.
>
> Unless you are hoisting a hundred feet of really heavy line, I don't
> see a
> problem with careful half hitches. If you use mule tape, it lays
> nicely
> against the cable and doesn't deform the jacket. We pull miles of
> fiber
> optics and the like with a simple clove hitch backed up with a couple
> of
> half hitches and a tight wrap of electrical tape.
>
> Good luck
>
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com [mailto:towertalk-
> > bounces@contesting.com] On Behalf Of Glenn Thorne
> > Sent: Tuesday, April 14, 2009 8:06 PM
> > To: towertalk@contesting.com
> > Subject: Re: [TowerTalk] Pull ropes in buried PVC
> >
> > Jim,
> >
> > How do you attach the cable to the pull rope? Lot's of electrical
> > tape?
> >
> > A related question: what's the best way to get a coax run up the
> tower?
> > The
> > last time I did this I just tied the coax to a rope and pulled it up,
> > taping
> > the coax to the tower as I came back down. But that was only a 40ft
> > tower.
> > I have a bit more to go this time and am worried about deforming the
> > cable.
> >
>
>
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