Which of the following is NOT a purpose of testing insulation resistance?

The primary purpose of testing insulation resistance is to ensure that the insulation around conductors is intact and functioning properly. By maintaining good insulation, the likelihood of electrical faults can be reduced, leading to safer operations and minimizing the risk of shock or fire. This testing is crucial in predicting conductor failure, as weakened insulation can signal impending breakdowns.

While the other purposes listed are closely related to insulation testing, determining overall system efficiency is not among the direct objectives of such tests. Insulation resistance testing does not provide insights into how efficiently an electrical system operates in terms of energy consumption or power factor. Instead, it focuses on the integrity and effectiveness of the insulation material, ensuring safety and reliability in electrical systems.