Which type of power cord must be used when leakage current exceeds the safety limit?

When leakage current exceeds the safety limit, the use of a three-prong power cord is critical for ensuring safety in electrical systems. The three-prong cord is designed with an additional grounding prong, which provides a path for any excess current to safely dissipate into the ground. This grounding feature reduces the risk of electric shock and helps protect both users and equipment from potential hazards that can arise from leakage current.

In contrast, a two-prong cord lacks this grounding capability and cannot effectively manage excess current, making it less safe in situations where leakage currents are a concern. The presence of a ground pin in a three-prong cord not only enhances safety but also complies with electrical codes and standards that mandate grounded connections for devices that are at risk of leakage currents.