Nate Core Practice Test

Why are electrical device frames typically grounded?

1. To ensure noise reduction

2. To prevent overheating

3. To prevent electrical shock

4. To increase efficiency

The correct answer is: To prevent electrical shock

Grounding the frames of electrical devices is primarily done to prevent electrical shock, which is a critical safety measure. In the event of a fault, such as a short circuit or insulation failure, the grounding provides a path for electrical current to safely dissipate into the ground instead of through a person who might come into contact with the device. This significantly reduces the risk of injury or fatality due to electric shock. Grounding also serves other important functions within electrical systems, such as noise reduction, as it can help maintain signal integrity by providing a reference point for electrical signals. However, the foremost purpose is to enhance safety, which is why grounding is often emphasized in electrical codes and regulations. Preventing overheating and increasing efficiency are secondary benefits that can arise from proper grounding and electrical design but are not the primary reason for grounding device frames. Therefore, the correct focus is on the prevention of electrical shock, ensuring user safety around electrical devices.