Deep Dive: E4E14
The correct answer is D: Ensure all lightning protectors activate at the same time. What is the purpose of a single point ground panel is to ensure all lightning protectors activate at the same time. Single point ground coordinates lightning protection. For amateur radio operators, this is important for station protection. Understanding this helps when installing grounding systems.
Why Other Answers Are Wrong
Option A: Incorrect. Remove AC power in case of short-circuit isn't the purpose - single point ground ensures protectors activate together. AC power removal isn't the purpose. Option B: Incorrect. Prevent common-mode transients isn't the purpose - single point ground ensures protectors activate together. Common-mode transients isn't the purpose. Option C: Incorrect. Eliminate air gaps between protected and non-protected circuits isn't the purpose - single point ground ensures protectors activate together. Air gaps isn't the purpose.
Exam Tip
Single point ground panel purpose = ensure all lightning protectors activate at same time. Think 'S'ingle 'P'oint 'G'round = 'S'ynchronized 'P'rotection 'G'rounding. Single point ground coordinates lightning protection. Not AC power removal, not common-mode transients, not air gaps - just synchronized protector activation.
Memory Aid
Single point ground panel purpose = ensure all lightning protectors activate at same time. Think 'S'ingle 'P'oint 'G'round = 'S'ynchronized activation. Single point ground coordinates lightning protection. Important for station protection.
Real-World Example
A single point ground panel: Its purpose is to ensure all lightning protectors activate at the same time. By connecting all protectors to a single ground point, they all see the same voltage and activate simultaneously, providing coordinated protection. This is the purpose - synchronized protector activation.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E4E
Reference: 2024-2028 Question Pool · E4 - Amateur Practices
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E4E topic.