Which of the following rules applies to coaxial cable installations under Article 820?

The correct choice highlights the importance of grounding in coaxial cable installations as outlined in Article 820. Grounding the outer shield of coaxial cables is crucial because it helps to protect the system from electromagnetic interference and provides a path for any fault currents to safely dissipate into the ground. This requirement ensures the safety and reliability of the coaxial cable system, reducing the risk of electrical noise that can affect signal quality and preventing potential hazards from static discharge or stray voltage.

Grounding close to the point of entry also minimizes the length of any ungrounded sections, further enhancing the effectiveness of the grounding. Overall, this practice plays an essential role in maintaining the integrity and safety of coaxial cable installations.