Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RAMS"

[Stephen Little]

Hi
Need some help with a tech question
How do i know the size of a rope to employ when pulling cable?

Is there a calc for this
The factors to be considered I'm guessing
lenght of pull
Number of men and there pull force
Dead Load
Live Load
Rope in Compression
Tension in rope
Bending forces on rope
Deflection????

any one?

 

[J&M Electrical]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

If the rope snaps, its not strong enough

 

[telectrix]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

the rope should bea a minimum of the size determined by the following equation.>>>>>>



(diameter of cable x weight in lbs per foot x length of duct in yards)/ (no. of men pulling x -------- circumference of the lead puller)

 

[morph]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

rope !
how big is the cable , i use a troop of ferrets

 

[Air Conditioner]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Actually Morph the collective noun for ferrets is business.
So you use a business of ferrets
.................yes I know I'm a pedant!:wink_smile:

 

[jimmymac]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

I use one ferret which is fed on strict protein & steroid diet.....know in manchester as a 'madferret'

 

[Knobhead]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

lenght of pull
On rollers or across bare ground?
Number of men and there pull force
Tug O War team or a couple of blokes from down the pub?
Dead Load
Is the cable run out or on a drum on a stillage?
Live Load
By live do you mean a downward pull? (I resisted, don’t pull live cables).
Rope in Compression
Let’s see you compress a rope, I for one will be impressed
Tension in rope
Ropes don’t come with a SWL rating. This has to be found in slinging and rigging books.
Bending forces on rope
Depends on the size, material and construction.
Deflection????
?????
any one?

As for the rope, I will try and find my riggers pocket book.

 

[Deleted member 26818]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

I wonder if there's a term for a number of pedants?

 

[morph]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Actually Morph the collective noun for ferrets is business.
So you use a business of ferrets
.................yes I know I'm a pedant!:wink_smile:

i knew it was not troop but i did not know what it was, thank you
ps
a troop is for monkeys

 

[ipf]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

I wonder if there's a term for a number of pedants?

Army of ants, so it might be 'infantry'

 

[johnboy6083]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Experience is the answer here mate. 9/10 times you will know by the run& the amount of men you have available. Every bend will require a bloke, unless rollers are used, but even then I'd want one there. If the amount of men you have is limited, then pull the cable out at intervals, and then pull it up the next section. IMO if your pulling so hard that the rope snaps, then your doing it wrong, and people further back are not grafting.

 

[Hiddo]

I have a rule of thumb guide which works on pulls though ducts 50m apart and generally let's me pull a cable 600m in a straightish line.

2mm less than the cable. So if you are pulling 6mm then use 4mm.

 

[mackers]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

think your pulling my plonker?

 

[Strima]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Lets not forget equal opportunities, and work the lumpy jumpers into the equations...

 

[Stephen Little]

Re: Pulling SWA cables is the rope strong enough...How much can a man pull "Calc's RA

Ok
some useful bits and some not so.

I understand if I’m to use a 20mm Nylon which has a UTS 8 ton loading appx

I know the 8ton is more than what I will be pulling up a 15meter riser

Rollers at the top and 3ton jacks in basement

4 men tugging and shoutie bloke in the basement

120 4c Cu Largest cable

Is there a British standard for the physical strength of a man?

We have one for a foot step....

with the ever increasing detail needed in RAMS

is there really not a system to be employed in making sure we have taken all reasonably
praticatible steps to maintain a proven safe system of working