Question

How should flush-mounted bus devices be fixed in the wall box?

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Answer

D — In wall boxes suitable for screw mounting; clamp mounting is usually not possible.

Correct: only wall boxes suitable for screw mounting may be used.

Source

KNX Basic Course Documentation — 9 — p. 109

All proposed choices (exam context)
  1. A.By clamp mounting, which is the normal method for bus devices.
  2. B.Screw or clamp mounting; either works equally well.
  3. C.By gluing the device into any available box.
  4. D.In wall boxes suitable for screw mounting; clamp mounting is usually not possible.
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Last updated: 19 May 2026

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