Paul, Even the best inspector can miss copper clad aluminum if they'er not careful. It is a late 60's - early 70's thing. The problem is when you tighten the screws down for the connection it can cut or split the copper and the screw gets into the aluminum. The old bimetallic connection, galvanic reaction thing happens. You now have the same problem that you would have with pure aluminum. My personal opinion is either treat it like aluminum and crimp on pig tails or change all of the devices to approved AL/CU type. One way to spot it as was said is by size, another is the romex sheath is a beige or light green color. It says copper clad aluminum embossed on the sheath if you can read it. The third way is to carefully nick one of the grounds with an insulated screwdriver. When I find it, and it's rare, I call it out just like aluminum. As far as missing it in an inspection is concerned, if it isn't installed correctly (King Kong electrician) it's no better than aluminum. Hope that helps Bruce Download Attachment: 3670RomexWwire.JPG 52.84 KB Thought I had Copper clad Aluminum today but it turned out to be solid copper. Bruce