There may be complicated formulas available in many books. We do not want to confuse you with complicated mathematical formula. The most friendly and easy formula to calculate the number of elements over a Central strength member is shown below.
Where R = Stranding radius, sum of half diameter of (CSM + Loose tube) i.e.: CSM dia/2 + Loose tube dia /2LT dia = Outside diameter of loose tube
Using this formula we can calculate the diameter of FRP or steel wire for central strength member in a fiber optic cable. Generally if 6 elements are to be applied over a CSM, then the diameter of CSM will be equal to the diameter of the elements. Thus for a 24 fiber cable, if we put 4 fibers in each loose tube, there will be 6 loose tubes.
If the loose tube diameter is 1.8 mm for the loose tubes, by using the above formula, the diameter of the CSM also will be 1.8mm.
Some manufacturers consider little more bigger diameter generally around 0.2 mm more for the central strength member. This gives additional strength to the cable and makes the jelly filling in the interstices easier. But the negative side of this design is bigger fiber cable that have comparatively more weight.
Put the above formula in an excel sheet. This will allow us to change many options for calculation.
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