CWEA Maintenance Technologist Practice Test

What device would be used to measure AC current flow in a large diameter conductor?

1. A digital multimeter

2. A clamp-on type ammeter

3. A standard voltmeter

4. A resistance meter

The correct answer is: A clamp-on type ammeter

The appropriate device for measuring AC current flow in a large diameter conductor is a clamp-on type ammeter. This type of ammeter is specifically designed to clamp around a conductor, allowing it to measure the current without the need to disconnect the conductor or interrupt the flow of electricity. This makes it particularly useful for large diameter conductors where access may be restricted or challenging. Additionally, clamp-on ammeters are capable of measuring AC current, which is essential for many industrial and commercial applications. They often come with features that allow for accurate measurement in varying conditions, enhancing their versatility in maintenance and troubleshooting scenarios. In contrast, other devices such as a digital multimeter or a standard voltmeter are not ideally suited for this purpose; they require direct connection and may not handle the larger currents safely or effectively. A resistance meter is not applicable in this case, as it measures resistance rather than current flow.