Which of the following is a common method to prevent electrical shock?

A proper grounding system is essential for electrical safety and is a fundamental method for preventing electrical shock. Grounding provides a low-resistance path for electrical current to flow safely to the earth in the event of a fault. This helps to prevent the buildup of voltage that can result in shock hazards. In an electrical system, grounding works to protect both people and equipment by minimizing the risk of electrical shock if a failure occurs, such as a short circuit or insulation failure.

When the system is properly grounded, it can significantly reduce the likelihood of dangerous voltage levels that an individual might come into contact with. This is critical in environments such as entertainment settings, where various electrical appliances, lighting, and stage equipment are used, as it ensures that any stray or fault currents are directed safely away, rather than through a person's body.

In contrast, the other choices do not provide the same level of reliable protection against electrical shock. Using higher voltage circuits does not mitigate the risk; in fact, it can increase the hazard. Energy-saving devices and LED fixtures are beneficial for energy efficiency and sustainability but do not specifically address the risk of electrical shock in the event of faults. Thus, grounding remains the most effective and common method to ensure safety against electrical shock.