Associated Builders And Contractors (ABC) Year 1 Practice Test

Which statement describes a safety or operational advantage of clamp-on meters?

They help minimize exposure to live parts by avoiding circuit interruption They require direct contact with the conductor They are only suitable for measuring voltage They can only be used with low-current circuits

Correct Answer:

They help minimize exposure to live parts by avoiding circuit interruption

Explanation:

Clamp-on meters measure current without opening the circuit, using a hinged clamp that surrounds a conductor. This lets you read current without making contact with live parts or interrupting power to the circuit, which reduces the risk of shock, arcing, and downtime. That noninvasive measurement is the main safety and operational advantage. The idea that they require direct contact with the conductor isn’t accurate—noncontact current measurement is exactly what the clamp does. They’re not limited to measuring voltage only; many clamp meters measure current and may also read voltage, and some can handle DC or very high current ranges. They aren’t restricted to low-current circuits; they’re designed to handle a wide range of currents.

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