Which of the following is NOT a benefit of proper grounding?

Improvement of electrical system efficiency is not a direct benefit of proper grounding. Grounding primarily serves safety functions, such as preventing electrical shock by providing a path for fault currents, protecting equipment from lightning strikes by directing excess voltage away, and reducing the risk of electrical fires through the safe dissipation of electricity.

While proper grounding can help stabilize a system and optimize its performance in some indirect ways—such as reducing electromagnetic interference—it does not inherently improve efficiency in the manner that, for example, properly sized conductors and equipment would. The focus of grounding practices is on safety and protection, rather than on boosting the efficiency of electrical operations.