What is the best method to check the electrical ground on a duplex outlet?

The best method to check the electrical ground on a duplex outlet is to check the continuity between the green wire and the building ground. This method directly assesses whether there is a complete electrical path back to the grounding system, which is crucial for ensuring safety. The green wire typically represents the ground wire in electrical systems, and a continuity test confirms that it is properly connected to the grounding system of the building.

Ensuring continuity means that any excess electricity can safely flow to the ground, mitigating risks such as electric shock or fire. This method is both effective and straightforward, allowing for a clear indication of whether the grounding system is functioning.

While testing voltage between the outlets, inspecting the physical condition of the outlet, or measuring the resistance of the ground wire can provide valuable information about the outlet and electrical system, they do not specifically confirm the integrity of the ground connection in the most direct and reliable manner as the continuity test does.