*Question G0B13:
Where should lightning arrestors be located?*  

*Correct Answer is  A: Where the feed lines enter the building*  

### AI Response: (may contain errors)  

To determine the proper location for lightning arrestors, we need to consider their purpose: to protect equipment from voltage surges caused by lightning strikes.

### Correct Answer: A - Where the feed lines enter the building

- **Reasoning**: 
  - Lightning arrestors should be installed at the point where the feed lines enter the building. This placement helps to divert any surge caused by a lightning strike away from the interior of the building and its connected equipment. By doing so, it minimizes the risk of damage to radios and other electronic devices.

### Why the Other Choices are Incorrect:

- **B: On the antenna, opposite the feed point**  
  - **Reasoning**: Placing lightning arrestors on the antenna itself does not effectively protect the equipment inside the building. If a lightning strike occurs, the surge would still travel down the feed line before reaching the arrestor, potentially damaging equipment before the surge is diverted.

- **C: In series with each ground lead**  
  - **Reasoning**: While grounding is essential for safety, placing arrestors in series with ground leads does not provide effective protection against surges. The arrestors need to be positioned to intercept surges before they reach sensitive equipment, which is not achieved by this configuration.

- **D: At the closest power pole ground electrode**  
  - **Reasoning**: This option is not effective because the arrestor needs to be as close to the entry point of the feed lines as possible. Placing it at a distant ground electrode does not protect the equipment inside the building from surges that may travel through the feed lines.

### Summary

- **Best Practice**: Install lightning arrestors at the entry point of feed lines into the building to ensure maximum protection against lightning-induced surges.
- **Rule of Thumb**: Always prioritize the placement of surge protection devices at the point of entry to minimize the risk of damage to internal equipment.