*Question T0B11:
Which of the following establishes grounding requirements for an amateur radio tower or antenna?*  

*Correct Answer is  B: Local electrical codes*  

### AI Response: (may contain errors)  

The correct answer to the question about grounding requirements for an amateur radio tower or antenna is:

**B: Local electrical codes**

### Explanation:

1. **Why the correct answer is correct:**
   - Local electrical codes are established by local authorities to ensure safety and compliance with electrical standards. These codes dictate how grounding should be implemented for structures, including amateur radio towers and antennas, to protect against electrical faults and lightning strikes. Compliance with these codes is essential for safety and legal operation.

2. **Why the other choices are incorrect:**
   - **A: FCC Part 97 rules**  
     - While FCC Part 97 governs amateur radio operations, it does not specifically address grounding requirements. It focuses more on licensing, operating procedures, and technical standards.
   
   - **C: FAA tower lighting regulations**  
     - FAA regulations pertain to the marking and lighting of towers to ensure aviation safety. They do not cover electrical grounding requirements for amateur radio installations.
   
   - **D: UL recommended practices**  
     - Underwriters Laboratories (UL) provides safety standards and testing for electrical devices and systems. However, their recommendations are not legally binding and do not replace local electrical codes, which are the primary authority for grounding requirements.

### Useful Rules of Thumb:
- Always check local electrical codes before installing a tower or antenna to ensure compliance.
- Grounding systems should typically include a ground rod, bonding of all metal structures, and proper connections to minimize resistance and enhance safety.