During high voltage surges, what provides a way of redirecting excess current to the ground?

• A. Surge arresters
• B. Lightning arresters
• C. Ground cables
• D. Insulators

Answer: (A)

Surge control devices that connect between the line and ground provide a path for transient overvoltages to be diverted safely. During a high voltage surge, these devices stay nonconductive under normal operating voltages but conduct heavily when the voltage spikes beyond their threshold. That conduction channels the excess current directly to the earth, clamping the voltage seen by equipment and protecting transformers, lines, and switches. Ground cables are helps in forming the return path, but they don’t regulate or divert surges on their own, and insulators would only block current rather than redirect it. While the term lightning arrester is sometimes used, surge arresters are the devices specifically designed to provide that controlled path to ground for surge currents.