Fiber Pull Box Distance

However first make sure the pull does not exceed the tensile loading limit established by the manufacturer for installation.

Fiber pull box distance. The cables minimum bending radii shall not be violated. How to calculate underground pull box sizing. Loops of cable commonly called service loops shall be provided at all intermediate pulling points such as in manholes and pull boxes. Inspect the cable run to ensure there are no sharp bends or corners that exceed the minimum bend radius of the fiber.

Typically optical fiber cables do not carry electrical power but the metallic components of a conductive cable. Installing a pull box after the second 90 degree bend or equivalent amount of degrees of bend in a conduit run is recommended. Procedures for pulling fiber optic cable. Trench boxes shoring.

And it promotes personal and site safety. Always install listed optical fiber raceways per the following ent rules. Fiber optic cables have kevlar aramid yarn or a fiberglass rod as their strength member. 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.

Never exceed the maximum pulling load rating. On long runs use proper lubricants and make sure they are compatible with the cable jacket. Determining the size of underground pull and junction boxes to meet nec 314 16 code standards is required to prevent damage to conductor insulation. Doing so can result in bending losses and or fiber breaks in the cable.

Optical fiber cables are designed with a minimum bending radius. Pull boxes shall be sized so that no cables in the box shall be tightly bent. 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. Generally the minimum bending radius of a fiber cable under load is 20 d where d is the diameter of cable.

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. On really long runs pull from the middle out to both ends. The cable should never be bent below its minimum bending radius. 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.

You should pull on the fiber cable strength members only. Calculating the correct size of pull box needed can be complicated so please feel free to contact us or call 800 767 1576 if you need assistance.