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

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

### AI Response: (may contain errors)  

Lightning arrestors are crucial for protecting your equipment from lightning strikes by providing a path to ground for the lightning energy. Let's break down the correct answer and why the other options are incorrect:

1. **Correct Answer: A: Where the feed lines enter the building**

   - **Explanation**: Placing lightning arrestors where the feed lines enter the building is essential because it ensures that any lightning-induced surges are diverted to ground before they can enter the building and potentially damage equipment or cause a fire. This location is the first point of entry for the feed lines, making it the most effective place to intercept and ground any surges.

2. **Why the other choices are incorrect**:

   - **B: On the antenna, opposite the feed point**
     - **Explanation**: While it might seem logical to place an arrestor near the antenna, this location is not effective because the surge can still travel down the feed line into the building. The goal is to protect the building and equipment, which is best achieved at the entry point.

   - **C: In series with each ground lead**
     - **Explanation**: Placing arrestors in series with ground leads is not practical or effective. Ground leads are meant to provide a direct path to ground, and adding components in series could impede this path or not address the main entry point of the surge.

   - **D: At the closest power pole ground electrode**
     - **Explanation**: This location is too far from the point of entry into the building. The arrestor needs to be as close as possible to where the feed lines enter the building to effectively protect the internal equipment.

**Rule of Thumb**: Always place lightning arrestors at the point where cables enter a structure to ensure that any surges are grounded before they can cause damage inside.