Which instrument should be used to measure the insulation of a rubber-covered electrical cable?

Which instrument should be used to measure the insulation of a rubber-covered electrical cable?

• A. Voltmeter
• B. Ammeter
• C. Ohmmeter
• D. Wattmeter

Answer: (C)

To measure the insulation of a rubber-covered electrical cable, an ohmmeter is the most suitable instrument. An ohmmeter specifically measures the resistance of materials. When assessing the insulation of electrical cables, it is crucial to determine how well the insulation material can prevent electrical current from leaking through to the outer surfaces or to other conductive materials. By using an ohmmeter, technicians can confirm that the insulation has sufficient resistance, ensuring it is intact and capable of withstanding the operational voltage without risk of electrical shock or shorts. Low resistance values could indicate insulation degradation or failure, while high resistance values suggest that the insulation is functioning properly. This process is essential for safety and reliability in electrical systems, as effective insulation prevents electrical hazards. Other instruments, such as a voltmeter, ammeter, or wattmeter, are used for different purposes like measuring voltage, current, and power, respectively, and are not designed for assessing insulation resistance. This reinforces why the ohmmeter is the appropriate choice for this specific application.

To measure the insulation of a rubber-covered electrical cable, an ohmmeter is the most suitable instrument. An ohmmeter specifically measures the resistance of materials. When assessing the insulation of electrical cables, it is crucial to determine how well the insulation material can prevent electrical current from leaking through to the outer surfaces or to other conductive materials.

By using an ohmmeter, technicians can confirm that the insulation has sufficient resistance, ensuring it is intact and capable of withstanding the operational voltage without risk of electrical shock or shorts. Low resistance values could indicate insulation degradation or failure, while high resistance values suggest that the insulation is functioning properly.

This process is essential for safety and reliability in electrical systems, as effective insulation prevents electrical hazards. Other instruments, such as a voltmeter, ammeter, or wattmeter, are used for different purposes like measuring voltage, current, and power, respectively, and are not designed for assessing insulation resistance. This reinforces why the ohmmeter is the appropriate choice for this specific application.