Certified Fiber Optics Practice Exam

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What does "OFNR" stand for related to fiber optic cable?

  1. Optical Fiber Non-Riser

  2. Optical Fiber Non-Rated

  3. Optical Fiber Network Rating

  4. Optical Fiber Resilient

The correct answer is: Optical Fiber Non-Riser

The term "OFNR" stands for Optical Fiber Non-Riser. This designation is used to describe fiber optic cables that are intended for use in vertical spaces between floors, specifically in applications where the cable is run in non-plenum spaces. Non-Riser cables are designed to limit the spread of fire, which is crucial in building codes and safety regulations. Understanding what OFNR implies is important for selecting the right type of cabling for different installation environments. For instance, cables rated as OFNR are suitable for general-purpose use in various locations but should not be used in air-handling spaces where plenum-rated cables (OFNP) are required. The other options provided do not accurately represent the meaning of OFNR. "Optical Fiber Non-Rated" incorrectly implies that the cable lacks a rating, while "Optical Fiber Network Rating" and "Optical Fiber Resilient" do not align with industry standards for fiber optic cable classifications, which necessitate precise terminology to ensure compliance with safety regulations and effective installations.

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