Question

What does the abbreviation SELV mean, and what is its key property?

Answer

B — Safety Extra Low Voltage: a low-voltage circuit electrically separated from higher voltages and isolated from earth

Correct: This matches the definition given for SELV.

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All proposed choices (exam context)

A.Standard Electrical Low Voltage: a circuit that must be bonded to protective earth
B.Safety Extra Low Voltage: a low-voltage circuit electrically separated from higher voltages and isolated from earth✓
C.Secure Ethernet Line Voltage: a data-only supply
D.Single Ended Low Voltage: a voltage referenced to one mains phase

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