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.
Source
KNX Basic Course Documentation — 1 — p. 96
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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