Question
How is the overvoltage protector with KNX bus connector design classified, and how does it differ from primary protection?
Answer
A — It is secondary protection at the devices; primary protection uses lightning current arresters on active conductors.
Correct: the overvoltage protector is secondary protection, distinct from the primary lightning current arresters.
Source
KNX Basic Course Documentation — 16 — p. 116
All proposed choices (exam context)
- A.It is secondary protection at the devices; primary protection uses lightning current arresters on active conductors.✓
- B.It is just the bus device's own 2 kV basic immunity.
- C.It is primary protection; secondary protection is the equipotential bonding bar.
- D.It is the same thing as a lightning current arrester.
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