Sorry, I have to resurrect this thread.
From what I understand, the Z540.1 is now obsolete and is being replaced with the Z540.3. I mentioned this in my internal audit, and our auditor says that this is not right, and that the Z540.3 is a completely different "animal" (in my auditors words) that the Z540.1. He also says we should be referencing Z540.1 on our certs.
I'm getting really frustrated on this because Z540.1 has been superceded, so using it goes against 17025 specs of using the most current standard. Can someone please help me on this???