Exactly - that's one of the possible interpretations of the ambiguous statement, but I have a feeling that holmslaw probably means the other one. It's hard to tell since, in response to my request for clarification, he merely repeated his previous, ambiguous, sentence!It is a common misconception thatIt is a common misconception that class 2 fittings do not contain exposed metallic parts, and if they do, they must not be earthed.
[1] class 2 fittings do not contain exposed metallic parts.
and
[2] if they do, they must not be earthed
Which can mean that "they must not be earthed" is also a mis-conception
Kind Regards,John.