Which device is most suitable for evaluating the insulation resistance of a conductor?

The most suitable device for evaluating the insulation resistance of a conductor is a Megger. A Megger, or insulation resistance tester, is specifically designed to apply a high voltage to the insulation of electrical conductors. It measures the resistance of the insulation material, ensuring that it is sufficient to prevent electrical leakage and maintain safety standards.

The Megger generates much higher voltages than a typical multimeter, making it effective for assessing the integrity of insulation, particularly in high voltage applications. This capability allows technicians to identify potential insulation breakdowns which could lead to safety hazards or system failures.

In contrast, a voltmeter measures voltage, an ammeter measures current, and an ohmmeter measures resistance but does not generate sufficient voltage required to test insulation resistance properly. Thus, these devices are not suitable for the specific purpose of evaluating insulation resistance in conductors.