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What is the purpose of insulation resistance testing?

  1. To measure the current flow through cables

  2. To ensure proper insulation functioning in cables

  3. To check voltage levels in a circuit

  4. To evaluate grounding systems

The correct answer is: To ensure proper insulation functioning in cables

The purpose of insulation resistance testing is to ensure proper insulation functioning in cables. This testing assesses the integrity of the insulation surrounding conductors in electrical systems. Proper insulation is crucial for preventing electrical leakage that can lead to short circuits, equipment damage, or even electrical shocks to personnel. During an insulation resistance test, a specialized meter applies a known voltage to the insulation while measuring the resistance. A high resistance reading indicates that the insulation is effective, meaning it can safely contain the electrical energy within the conductors. If the resistance is low, it suggests potential insulation failure or degradation that requires attention, such as replacing or repairing the insulation or cable. This testing is essential in both maintenance and commissioning phases of electrical equipment, ensuring long-term safety and reliability in an industrial setting.