*Question G0B04:
Where should the station’s lightning protection ground system be located?*  

*Correct Answer is  B: Outside the building*  

### AI Response: (may contain errors)  

For effective lightning protection, the ground system should be located **outside the building**. Here's why:

1. **Correct Answer: B - Outside the building**
   - The primary goal of a lightning protection ground system is to safely direct the high current from a lightning strike away from the building and its contents. By placing the ground system outside, you minimize the risk of lightning current entering the building and causing damage to equipment or starting a fire.

2. **Why the other choices are incorrect:**
   - **A: As close to the station equipment as possible**
     - Placing the ground system close to the equipment inside the building can increase the risk of lightning current entering the building, which can damage equipment and pose safety hazards.
   - **C: Next to the closest power pole**
     - Grounding near a power pole does not effectively protect the station. The ground system should be directly connected to the station's grounding system to ensure a low-resistance path to earth.
   - **D: Parallel to the water supply line**
     - While water pipes can sometimes be used as a grounding electrode, running the ground system parallel to the water supply line is not a standard practice for lightning protection and does not ensure the best path for lightning current.

**Key Rule of Thumb:**
- The ground system should provide the shortest and most direct path to earth, minimizing the potential for lightning current to enter the building. This is best achieved by placing it outside the building.