What Conductors Cannot Be Used With Screwless Pressure Terminals Of The Conductor Push In Type?

What Conductors Cannot Be Used With Screwless Pressure Terminals Of The Conductor Push In Type? Screwless pressure terminal connectors of the conductor push-in type are for use only with solid copper and copper-clad aluminum conductors. What is the largest conductor that shall be permitted to be connected by means of wire-binding screws? In accordance with

Are Push-in Wire Connectors Better Than Wire Nuts?

Are Push-in Wire Connectors Better Than Wire Nuts? There are also push-fit-type wire connectors, which make very secure connections and are easy to use. But they are more expensive than wire nuts, and loosening them in the future when you need to remove a device can be more difficult. Are push in wire connectors reliable?