*Question G0B07:
Which of these choices should be observed when climbing a tower using a safety harness?*  

*Correct Answer is  B: Confirm that the harness is rated for the weight of the climber and that it is within its allowable service life*  

### AI Response: (may contain errors)  

When climbing a tower using a safety harness, it's crucial to prioritize safety by ensuring that the equipment is appropriate and in good condition. Let's break down the choices:

1. **Correct Answer: B**  
   - **Explanation**: Confirming that the harness is rated for the weight of the climber and that it is within its allowable service life is essential for safety. A harness that is not rated for the climber's weight or is past its service life may fail, leading to serious injury or death. Always check the manufacturer's specifications and expiration date before use.

2. **Why the Other Choices are Incorrect**:
   - **Choice A**: "Always hold on to the tower with one hand" is not a comprehensive safety measure. While maintaining a grip can be helpful, relying solely on holding the tower is not sufficient. A properly rated and secured harness is the primary safety device.
   - **Choice C**: "Ensure that all heavy tools are securely fastened to the harness" is important for preventing dropped tools, but it does not directly relate to the safety of the climber in terms of harness use. The focus should be on the harness's condition and rating.

3. **Useful Rules of Thumb**:
   - Always inspect your safety equipment before each use.
   - Follow the "3-point contact" rule: always have three points of contact with the tower (two hands and one foot, or two feet and one hand) when climbing.
   - Regularly review and adhere to safety guidelines and training for tower climbing.

By focusing on the condition and rating of the harness, you ensure that the primary safety equipment is reliable, which is why choice B is the correct answer.