Thanks, guys. I actually looked at those Articles, but wondered if there was anything eles. After rereading them, I think they are sufficient by themselves. This is another pesky Home Inspection Report that insists that the 40 amp CB is a violation, and recommends installing a 30 amp CB(the same report that says that an EGC is necessary for the operation of GFCI receptacles). I told the homeowner that in the case of AC equipment that this is acceptable. It looks like a new unit installed on original wiring. I'll look at the nameplate data, and ensure that the #10 is sufficient.