Question

How must a SELV network be treated with respect to earth?

Answer

A — It may not be earthed and is isolated from earth and protective earth conductors

Correct: SELV must not be earthed and stays isolated from earth and PE conductors.

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All proposed choices (exam context)

A.It may not be earthed and is isolated from earth and protective earth conductors✓
B.It must be solidly earthed at the power supply
C.It must be connected to the protective earth of the mains
D.It must be earthed only in wet rooms

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