OSP Aerial Plant & Pole Line Design 1 — Questions and Answers
Question 1: What is the minimum vertical clearance required for communication cables crossing a public road according to the National Electrical Safety Code (NESC)?
- 15.5 feet
- 18 feet
- 16.5 feet (Correct answer)
- 12 feet
Correct answer: 16.5 feet
The NESC requires a minimum vertical clearance of 16.5 feet for communication cables crossing roads open to truck traffic.
Question 2: Which pole classification system is most commonly used in the United States for specifying wood utility poles?
- ANSI O5.1 Classification (Correct answer)
- IEEE 691 Standard
- RUS 1724E-200 Specification
- NEC Article 230 Rating
Correct answer: ANSI O5.1 Classification
ANSI O5.1 is the American National Standard for wood poles used in utility construction, defining species, class, and length requirements.
Question 3: In aerial plant design, what is the primary purpose of a down guy wire?
- To connect adjacent poles for grounding
- To counteract horizontal tension forces on a pole (Correct answer)
- To support the weight of cable aerial strand
- To anchor the pole base to the soil
Correct answer: To counteract horizontal tension forces on a pole
Down guys are installed to counteract the unbalanced horizontal tension forces caused by cable pulls at corner, dead-end, or angle poles.
Question 4: What does the term 'make-ready' refer to in aerial OSP design?
- The process of installing a new utility pole
- Modifications to existing pole infrastructure to accommodate new attachments (Correct answer)
- Preparing cable reels for installation
- Scheduling crews for a construction project
Correct answer: Modifications to existing pole infrastructure to accommodate new attachments
Make-ready refers to the engineering work and physical modifications required on existing poles or infrastructure to allow new attachments while maintaining safety clearances.
Question 5: What is 'lashing' in the context of aerial cable installation?
- Tying cables to ground anchors for support
- Securing aerial cable to a messenger strand using a lashing wire (Correct answer)
- Attaching guy wires to anchor plates
- Bonding cable sheaths to the grounding system
Correct answer: Securing aerial cable to a messenger strand using a lashing wire
Lashing is the process of spirally wrapping a lashing wire around both the messenger strand and the cable to mechanically support the cable in the air.
Question 6: A Class 3 wood pole is rated compared to a Class 1 pole of the same species and height as having:
- Greater load-bearing capacity
- The same load-bearing capacity but a different treatment
- Lower load-bearing capacity (Correct answer)
- A longer expected service life
Correct answer: Lower load-bearing capacity
Higher ANSI class numbers indicate smaller minimum circumference and therefore lower load-bearing capacity; Class 1 is stronger than Class 3.
Question 7: Which type of pole attachment agreement governs how a telecom provider attaches to a power utility's poles?
- FCC Form 496 Agreement
- NESC Section 23 Permit
- Joint Use or Pole Attachment Agreement (Correct answer)
- BICSI TD-011 License
Correct answer: Joint Use or Pole Attachment Agreement
A Joint Use or Pole Attachment Agreement is the legal contract between pole owners (typically electric utilities) and attaching parties (telecom providers) that governs attachment fees, clearances, and responsibilities.
OSP Aerial Plant & Pole Line Design 1
What is the minimum vertical clearance required for communication cables crossing a public road according to the National Electrical Safety Code (NESC)?