What is the purpose of using a grounding wire in a cable?

Using a grounding wire in a cable serves the critical purpose of providing a safe path for electrical current to flow to the ground in the event of a fault, such as a short circuit. This is vital for protecting both equipment and the personnel who may interact with the electrical system.

When a fault occurs, the grounding wire helps to divert excess electricity away from the circuitry and into the ground, thereby reducing the risk of electrical shock or fire caused by stray current. This safety feature is essential in maintaining the integrity of electrical systems and ensuring safe operation.

In contrast, options focusing on increasing electrical flow, reducing wear on other wires, or improving insulation do not capture the fundamental safety role of the grounding wire. While those aspects contribute to the overall efficiency and durability of an electrical system, they do not address the immediate protective function that grounding provides in fault conditions.