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.

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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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