Questions: 4. A ground test utilizing an earth ground resistance tester is known as the

The answer is the first one: a ground test utilizing an earth ground resistance tester is known as the "fall-of-potential method."

Explanation:

1. Fall-of-Potential Method: This is a common and widely accepted method for measuring the resistance of a grounding system. It involves driving two auxiliary electrodes into the ground at specific distances from the ground electrode under test and measuring the potential difference between them. This method provides accurate results and is used to ensure that the grounding system meets safety standards.

2. Other Methods: While there are other methods for testing ground resistance, such as the clamp-on method or the 62% method, the fall-of-potential method is specifically known for its use of an earth ground resistance tester.

Summary: The fall-of-potential method is a standard technique for measuring ground resistance using an earth ground resistance tester.