"JJ" wrote in message

The inspector could
claim that I am not allowed to punch holes there. Siemens/Murray are of
absolutly of NO help. I will think twice before using their stuff
again.

Don't blame Siemens/Murray, blame either yourself or the inspector. Why not
ask him if he will accept the holes there? Sometimes you are 100% right,
but the inspector has some other idea. He wins.