Which of the following is true when installing grounding conductors used for lightning protection?
The correct answer is C: Sharp bends must be avoided. When installing grounding conductors for lightning protection, sharp bends must be avoided. Sharp bends increase inductance and resistance, reducing the effectiveness of lightning protection. Ground conductors should have gradual, smooth bends to maintain low impedance. For amateur radio operators, this helps ensure effective lightning protection. Understanding this helps create proper ground systems.
Exam Tip
Grounding conductors = avoid sharp bends. Think 'S'harp 'B'ends = 'S'lower (higher impedance). Sharp bends increase inductance and resistance, reducing lightning protection effectiveness. Use gradual, smooth bends.
Memory Aid
"Grounding conductors = avoid sharp bends. Think 'S'harp 'B'ends = 'S'lower (higher impedance). Sharp bends increase inductance, reducing lightning protection. Use gradual, smooth bends for best performance."
Real-World Application
You're installing ground wires from your tower to ground rods. You make gradual, smooth bends rather than sharp 90-degree turns. A sharp bend would increase the wire's inductance and resistance, making it less effective at carrying lightning energy to ground. Smooth, gradual bends maintain low impedance for effective protection.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Grounding conductors should be insulated or bare depending on application, but insulation isn't the key issue - the bend radius is more important.
Option B: Incorrect. Precise right-angle bends are actually bad - they increase inductance. Gradual bends are better.
Option D: Incorrect. Common grounds are actually good - all ground rods should be bonded together. The issue is bend radius, not common grounds.
题目解析
The correct answer is C: Sharp bends must be avoided. When installing grounding conductors for lightning protection, sharp bends must be avoided. Sharp bends increase inductance and resistance, reducing the effectiveness of lightning protection. Ground conductors should have gradual, smooth bends to maintain low impedance. For amateur radio operators, this helps ensure effective lightning protection. Understanding this helps create proper ground systems.
考试技巧
Grounding conductors = avoid sharp bends. Think 'S'harp 'B'ends = 'S'lower (higher impedance). Sharp bends increase inductance and resistance, reducing lightning protection effectiveness. Use gradual, smooth bends.
记忆口诀
Grounding conductors = avoid sharp bends. Think 'S'harp 'B'ends = 'S'lower (higher impedance). Sharp bends increase inductance, reducing lightning protection. Use gradual, smooth bends for best performance.
实际应用示例
You're installing ground wires from your tower to ground rods. You make gradual, smooth bends rather than sharp 90-degree turns. A sharp bend would increase the wire's inductance and resistance, making it less effective at carrying lightning energy to ground. Smooth, gradual bends maintain low impedance for effective protection.
错误选项分析
Option A: Incorrect. Grounding conductors should be insulated or bare depending on application, but insulation isn't the key issue - the bend radius is more important. Option B: Incorrect. Precise right-angle bends are actually bad - they increase inductance. Gradual bends are better. Option D: Incorrect. Common grounds are actually good - all ground rods should be bonded together. The issue is bend radius, not common grounds.
知识点
Grounding conductors, Lightning protection, Conductor installation, Ground system design
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.