As the title states, are there any code restrictions in general on using crimped spade and ring terminal connectors when wiring household electrical circuits?
I've actually been doing this for a while, using 600V rated spade connectors from Home Depot, and Wago's Wall-Nuts, and I've inspected some of my work that has been installed for over a year and saw nothing worrisome but I thought it might be good to ensure I'm not totally violating code here.
An example of something done recently:
EDIT: I predict a lot of "you don't need to do that" or "that's overkill" replies: Yes, that's totally obvious, but I like to over-engineer things.
Best Answer
After further review, it appears that receptacles and switches are listed for use with crimp terminals. So this installation would not be a violation of NEC 110.3 (B).