Why are metal cabinets for lighting circuits grounded?

Grounding metal cabinets for lighting circuits is primarily done to minimize the possibility of electric shock. When a metal cabinet is properly grounded, it provides a safe path for electrical current to flow in the event of a fault, such as a short circuit or equipment failure. This grounding ensures that if there is a malfunction that causes the metal cabinet to become energized, the electrical current will be directed safely to the ground rather than through a person who might touch the cabinet.

This safety measure is crucial because it significantly reduces the risk of injury or fatality associated with electric shock. Grounding acts as a protective mechanism to safeguard not only the equipment but also the individuals who may come into contact with it. By ensuring that the metal cabinet cannot become a source of electrical hazard, grounding serves a vital role in electrical safety protocols.