What is a ground used for?

• A. An insulated conductor used to carry fault current
• B. A non-insulated conductor used for fault current and protection against induction or energization
• C. A device to generate corona
• D. A conductor used only for signaling

Answer: (B)

Ground provides a low-impedance path for fault current to flow to earth, which lets protective devices sense the fault and trip quickly, reducing the risk of shock and equipment damage. It also keeps exposed metal parts at or near earth potential and helps keep voltages from rising due to induction or energization by providing a stable reference to earth. Grounding conductors are typically bare or green-insulated to minimize impedance; insulation would hinder the fault current path. This function isn’t about generating corona or signaling, so those options don’t fit.