Bent Out of Shapes

Bend anything too much and it kinks or breaks, and that includes fiber optic cable. Do you know how to handle fiber optic cable so it won’t be damaged by improper installation?

1. Most things either bend permanently (kink) or break when bent too far, and fiber optic cable may _______.

Correct Answer: All of the above

2. Fiber optic cable, as well as almost all cables and even conduit, has minimum bend _______ and _______ specifications. (Choose two.)

Correct Answer: Diameter
Correct Answer: Radius

3. The diameter of a round object, such as a cable, wheel or pulley, is the measurement across the widest part of the object.

Correct Answer: True

4. The radius of a circle (or any round object) is the distance from the center of the circle to the outside of the circle or _______ the diameter.

Correct Answer: Half

5. While being pulled through conduit under tension, most fiber optic cables have a minimum bend radius that is _______ times the diameter of the cable.

Correct Answer: 20

6. Most fiber optic cables have a minimum bend radius of _______ times the diameter of the cable after pulling and under no tension (for example, when they are stored in loops).

Correct Answer: 10

7. An easy way to keep bend radius and diameter straight is to think that bend radius refers to going around corners while bend diameter refers to pulleys, capstans or storage loops.

Correct Answer: True

8. A fiber optic cable that is 12.5 millimeters (mm) or 0.5 inch in diameter would have a minimum bend radius of _______ while being pulled in conduit.

Correct Answer: 250 mm or 10 inches

9. The same fiber optic cable that is 12.5 mm or 0.5 inch in diameter would require a pulling capstan or pulley that was _______ in diameter.

Correct Answer: 500 mm or 20 inches

10. The same fiber optic cable that is 12.5 mm or 0.5 inch in diameter could be safely stored coiled up in a manhole or connection box with loops _______ in diameter.

Correct Answer: 125 mm or 5 inches

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