What is the purpose of a safety wire through a turnbuckle used to tension guy lines?
The correct answer is B: Prevent loosening of the turnbuckle from vibration. The purpose of a safety wire through a turnbuckle used to tension guy lines is to prevent loosening of the turnbuckle from vibration. Turnbuckles can loosen over time due to vibration from wind, antennas, or other sources. Safety wire (lock wire) prevents the turnbuckle from rotating and loosening. For amateur radio operators, this is essential for maintaining tower stability. Understanding this helps maintain safe tower installations.
Exam Tip
Safety wire = prevents turnbuckle loosening. Think 'S'afety 'W'ire = 'S'tops 'W'orking loose. Prevents turnbuckle from rotating due to vibration. Not for securing if broken, not for grounding, not for measuring tension.
Memory Aid
"Safety wire = prevents turnbuckle loosening. Think 'S'afety 'W'ire = 'S'tops 'W'orking loose. Prevents vibration from causing turnbuckle to unscrew. Essential for maintaining guy line tension."
Real-World Application
Your tower guy lines use turnbuckles for tensioning. You install safety wire through the turnbuckle to prevent it from rotating. Wind and vibration would otherwise cause the turnbuckle to slowly unscrew over time, loosening the guy line and compromising tower stability. The safety wire locks the turnbuckle in place.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Safety wire doesn't secure the guy line if the turnbuckle breaks - if the turnbuckle breaks, the safety wire won't hold the load. The guy line itself must be strong enough.
Option C: Incorrect. Safety wire doesn't provide a ground path - it's too small and not designed for grounding. Grounding is done with proper ground wires.
Option D: Incorrect. Safety wire doesn't measure tension - that's done with tension gauges or by measuring guy line sag. Safety wire prevents loosening, it doesn't measure anything.
题目解析
The correct answer is B: Prevent loosening of the turnbuckle from vibration. The purpose of a safety wire through a turnbuckle used to tension guy lines is to prevent loosening of the turnbuckle from vibration. Turnbuckles can loosen over time due to vibration from wind, antennas, or other sources. Safety wire (lock wire) prevents the turnbuckle from rotating and loosening. For amateur radio operators, this is essential for maintaining tower stability. Understanding this helps maintain safe tower installations.
考试技巧
Safety wire = prevents turnbuckle loosening. Think 'S'afety 'W'ire = 'S'tops 'W'orking loose. Prevents turnbuckle from rotating due to vibration. Not for securing if broken, not for grounding, not for measuring tension.
记忆口诀
Safety wire = prevents turnbuckle loosening. Think 'S'afety 'W'ire = 'S'tops 'W'orking loose. Prevents vibration from causing turnbuckle to unscrew. Essential for maintaining guy line tension.
实际应用示例
Your tower guy lines use turnbuckles for tensioning. You install safety wire through the turnbuckle to prevent it from rotating. Wind and vibration would otherwise cause the turnbuckle to slowly unscrew over time, loosening the guy line and compromising tower stability. The safety wire locks the turnbuckle in place.
错误选项分析
Option A: Incorrect. Safety wire doesn't secure the guy line if the turnbuckle breaks - if the turnbuckle breaks, the safety wire won't hold the load. The guy line itself must be strong enough. Option C: Incorrect. Safety wire doesn't provide a ground path - it's too small and not designed for grounding. Grounding is done with proper ground wires. Option D: Incorrect. Safety wire doesn't measure tension - that's done with tension gauges or by measuring guy line sag. Safety wire prevents loosening, it doesn't measure anything.
知识点
Safety wire, Turnbuckles, Guy line tensioning, Tower maintenance
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.