Question
On a KNX power supply unit, what does a YELLOW LED indicate?
Answer
D — An external voltage higher than 30 V has been applied to the bus side
Correct: Yellow indicates an external voltage above 30 V on the bus side.
Start 10 free questions
Free · No account · No payment card
An error or unclear wording? Report this questionAll proposed choices (exam context)
- A.The unit is overloaded, possibly due to a short circuit
- B.The 230 V mains supply has failed
- C.The power supply is active and within its normal operating range
- D.An external voltage higher than 30 V has been applied to the bus side✓
Full bank
Keep going with the full KNX Basic bank
Keep going with the full KNX Basic bank: unlimited timed mock exams, detailed answers, history. From €9 (one-time payment).
See pricing — from €9 →Want more?
Continue KNX Basic practice
Related questions
- What nominal system voltage does a KNX TP power supply unit produce and monitor?KNX Installation
- What is the minimum voltage a KNX TP bus device needs for safe operation?KNX Installation
- For at least how long can a KNX power supply unit bridge a short interruption of the mains?KNX Installation
- How is a KNX TP line supplied with bus voltage?KNX Installation
- Why is a KNX TP power supply unit resistant to short circuits?KNX Installation