MTA Transit Electrical Helper Exam 2025 – 400 Free Practice Questions to Pass Exam No. 4612

Question: 1 / 400

Why are metal cabinets for lighting circuits grounded?

To provide aesthetic appeal

To enhance conductivity

To minimize the possibility of shock

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.

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To prevent overheating

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