Found this recently, done by a licensed electrical company in the state of California.
Is this compliant? If not, is there anything that could be added to make it legal? (I see "ground clamps" for attaching wire to pipe that look as if they'd provide a mechanical connection.) Would you just parcel them out into appropriately sized wire nuts? The box is a 2 gang, and getting full, but it's in a crawlspace, so could get an extension if needed.
Best Answer
Simply twisting is not enough. You need a mechanical connection as well. Wire nut, crimp, etc.
NEC