What type of test assesses only the initial resistance in all conductive parts?

The insulation spot test is specifically designed to evaluate the initial resistance of all conductive parts within an electrical system. This test involves applying a voltage to the insulation and measuring the resistance, which helps in identifying any potential insulation failures at specific locations. It focuses on assessing the integrity of insulation at a particular point, ensuring that there are no weak spots that may lead to electrical faults.

In contrast, the dielectric absorption test evaluates how well an insulator can maintain its resistive properties over time, while the ground continuity test ensures there is a proper ground path between conductive parts and the ground, indicating safety and effective fault protection. The polarization index test involves measuring insulation resistance over a specific time period to assess the insulation's condition and can reveal changes in resistance related to moisture or contamination rather than just assessing initial resistance. Thus, the insulation spot test is the most appropriate choice for assessing initial resistance in conductive parts.