FOC Pulling Force Calculation from UPVC Conduit

https://books.google.com/books?id=ollCd0FRmcoC&pg=PA4&lpg=PA4&dq=how+long+a+piece+of+fiber+optic+cable+can+be+dragged+through+conduit&source=bl&ots=elvLIHH3Xi&sig=ACfU3U2hMss3EuuZCuREyDVdIS0CvCcWPg&hl=en&sa=X&ved=2ahUKEwjqhY3Rn_npAhWaSDABHZo8CvAQ6AEwAHoECAgQAQ#v=onepage&q=how%20long%20a%20piece%20of%20fiber%20optic%20cable%20can%20be%20dragged%20through%20conduit&f=false

https://www.acronymfinder.com/FOC.html#:~:text=What does FOC stand for?, 112 more rows

Fiber Optic Cable

A simple telephone call to the <...FOC...> supplier will answer many questions, because some things do not respond to calculation; the "slipperiness" or state of lubrication of the <...FOC...> and the inside of the <...6 inch PVC-U conduit (internal dia 150mm) which has 12 sub-conduits (1inch each, external dia 31mm) at 90 degree angle entry into the building and a bending radius of 914mm...> being singular to this particular installation.

Hello,

Not my expertise, but there will be another force to consider and that will be the sequential deformation of the cable as it passes through the bend area. This will highly dependant on the individual cable configuration.

Imagine the effort required if the cable was a single solid core.

As others have suggested, contact the cable manufacturer for their support.

<...Tensile strength = 2700 Newton...> ≅ ¹/₄ tonne.

So it would take a pulling machine to break it. A human is usually not capable of providing this force without some mechanical contraption.

The firm installing the <...FOC...> would be able to advise.

(not an endorsement)

Do not use WD-40, baby oil, grease, vasoline,etc, as these materials can deteriorate the insulation over time. ...use proper wire lube....

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https://buy.wesco.ca/static/catalog/products/images/PDF/IDEAL_IDELINC00005_E6.pdf

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Field installers who use this sometimes call it "boy butter".

"Pulling soap" is also a common term.

...yellow 77.

And a tugger. Oops- that might exceed the 1/4 tonne pull mentioned earlier.

Talc will do a great job of lubricating the cables.

Beware the twang factor, if the cables go twang you have overdone the pulling.

To get technical you could use a Force Gauge connected to your pulling device to ensure you do not exceed the maximum allowable value.

Link.

Just a thought: it would probably be a lot easier to pull the fibre straight into the sub-conduits, then, pull the sub-conduits into the main conduit.

I would use something like this for the offshoots...

...split the wire off while installing the fitting...

...then into a 45°...

The first image looks suspiciously like a plumbing fitting. I have never seen an electrical conduit fitting like that. The advice to "split off the wire while installing the fitting" would not fly here in Canada. Rule 12-938 states that raceways (conduits) shall be installed as a complete system before the conductors or cables are installed in them. It has always seemed an odd rule to me (and who is going to know unless the inspector shows up at the time), but there it is. I suppose it is to prevent partially installed conductors/cables lying around and being damaged by construction activity, but surely with care and good sense this needn't be a risk. Nevertheless, the rule is there, and no exceptions to it are given.

Yeah, I don't think that is electrical, it's just the first picture I found that illustrated what I wanted...Yeah that's probably a rule here as well...in which case you would need junction boxes at every branch....I was just thinking of an alternative method under extenuating circumstances...

That's an awful lot of calculation.

any software or calculation sheet available on net? any ideas?

All turns in fiber optic cable should be done at junction boxes only...no elbows or bends allowed.

Be certain to use only PVC CONDUIT,not PVC plumbing pipe.

The couplings and interior are designed differently to prevent damage to the cables.

There are many specialized tools required when pulling long runs of fiber cable,such as this:

There are many other specialized tools and equipment as well.

This is not a job for a beginner,or ad-hoc designed methods.

My advice: Hire a professional with experience in this field.

Most Prime Contractors require a performance bond certificate from sub-contractors,usually in the $$millions.