Registered Communications Distribution Designer (RCDD-001) — Question 7
An installation crew is pulling an optical fiber cable into a riser. The cable has an outside diameter of 25 mm (1 in). As the cable is being pulled off the reel and through a pulley into the riser, you must verify that the minimum bend radius for the cable being pulled is observed. The pulley must be sized at a MINIMUM of:
Answer options
- A. 254 mm (10 in)
- B. 381 mm (15 in)
- C. 508 mm (20 in)
- D. 635 mm (25 in)
- E. 762 mm (30 in)
Correct answer: B
Explanation
The correct answer is B, as the minimum bend radius for fiber optic cables is typically 15 times the cable's diameter. In this case, 15 times 25 mm is 375 mm, so a pulley of at least 381 mm is necessary. The other options either do not meet the minimum requirement or exceed it without necessity.