Question
What does 'primary protection' mean in the KNX lightning-protection context?
Answer
B — Connecting active conductors indirectly to the equipotential bonding bar via lightning current arresters.
Correct: this indirect connection of active conductors through lightning current arresters is primary protection.
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An error or unclear wording? Report this questionAll proposed choices (exam context)
- A.Fitting an overvoltage protector directly at each bus device.
- B.Connecting active conductors indirectly to the equipotential bonding bar via lightning current arresters.✓
- C.The basic 2 kV immunity built into every bus device.
- D.The reverse-polarity keying of the TP bus connector.
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