Which IEEE standard is referenced for fall-of-potential testing?

The correct reference for fall-of-potential testing is IEEE Standard 81. This standard specifically provides guidelines for resistance measurements of grounding systems and is essential for understanding how to properly perform tests that ascertain the effectiveness of grounding systems through fall-of-potential methods. This testing approach helps ensure that the grounding system is adequately designed and provides a low-resistance path for fault currents, which is crucial for both safety and operational effectiveness in electrical systems.

The other standards listed do not focus on the fall-of-potential testing method. For example, IEEE Standard 80 outlines the grounding of electrical substations and offers broader guidelines regarding design and testing practices, while IEEE Standard 82 deals with the specifications for electrical safety in providing grounding systems. IEEE Standard 83 includes specifications related to the grounding and bonding of equipment in the context of electrical installations, but it does not specifically address the fall-of-potential method. Thus, only IEEE Standard 81 directly pertains to the fall-of-potential testing practice, making it the correct answer.