Never exceed the maximum pulling load rating.
Fiber pull box distance.
You should pull on the fiber cable strength members only.
In many runs if the pulling distance is short enough and the pathway straight enough fiber optic cable can be pulled by hand without the use of special equipment.
Doing so can result in bending losses and or fiber breaks in the cable.
The cables minimum bending radii shall not be violated.
Figure 4 figure 5.
On really long runs pull from the middle out to both ends.
Fiber optic cables have kevlar aramid yarn or a fiberglass rod as their strength member.
Generally the minimum bending radius of a fiber cable under load is 20 d where d is the diameter of cable.
How to calculate underground pull box sizing.
A length of free cable shall be provided at each end of a cable pull.
Determining the size of underground pull and junction boxes to meet nec 314 16 code standards is required to prevent damage to conductor insulation.
362 24 bending radius 362 26 maximum total bends between pull points 360 362 28 trimmed to remove rough edges 362 30 support every 3 ft within 3 ft of any enclosure 362 48 joints between tubing fittings and boxes what about raceway fill.
2 in many runs if the pulling distance is short enough and the pathway straight enough fiber optic cable can be pulled by hand without the use of special equipment.
Trench boxes shoring.
Always install listed optical fiber raceways per the following ent rules.
At river crossings the distance between the bottom of the water and the drilling hole should be 10 times the diameter of the pipe and not less than 3 m 10 feet.
Ansi tia 569 b 2004 commercial building standard for telecommunications pathways and spaces section 8 8 2 3 offers some guidance regarding cable fill in conduit.
Optical fiber cables are designed with a minimum bending radius.
On long runs use proper lubricants and make sure they are compatible with the cable jacket.
And it promotes personal and site safety.
Installing a pull box after the second 90 degree bend or equivalent amount of degrees of bend in a conduit run is recommended.
The cable should never be bent below its minimum bending radius.
However first make sure the pull does not exceed the tensile loading limit established by the manufacturer for installation.
Typically optical fiber cables do not carry electrical power but the metallic components of a conductive cable.
Procedures for pulling fiber optic cable.
Pull boxes shall be sized so that no cables in the box shall be tightly bent.
