If a fuse is de-energized and removed from the circuit, how should you test it?

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Study for the Low Voltage Qualification Test. Explore flashcards and multiple-choice questions with hints and explanations for each, ensuring thorough preparation!

Multiple Choice

If a fuse is de-energized and removed from the circuit, how should you test it?

Explanation:
When a fuse is de-energized and removed, test continuity with an ohmmeter. A good fuse is essentially a short conductor, so it should show very low resistance, near 0 ohms. If the fuse is blown, the element breaks and the meter will read infinite or very high resistance. Visual inspection alone can miss an internal failure, so it’s not reliable. A voltmeter across the fuse isn’t meaningful since there’s no power in the circuit after removal. A megohmmeter measures insulation resistance and isn’t appropriate for checking a fuse's condition.

When a fuse is de-energized and removed, test continuity with an ohmmeter. A good fuse is essentially a short conductor, so it should show very low resistance, near 0 ohms. If the fuse is blown, the element breaks and the meter will read infinite or very high resistance. Visual inspection alone can miss an internal failure, so it’s not reliable. A voltmeter across the fuse isn’t meaningful since there’s no power in the circuit after removal. A megohmmeter measures insulation resistance and isn’t appropriate for checking a fuse's condition.

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