Wire stripper and twister - GIF

[VinnieL]

I was told the reason the U.S. Electrical Code prohibits soldered connections is that too many people think "soldering" is laying two wires side by side and running or globbing molten solder between them. The lead, silver, tin of the solder melts wasily and can result in an open or short circuit or fire.
It does take a good mecanical connection to make a good electrical connection.
I like this tool!
Some people simply stick the stripped ends of wires to be joined in a "wirenut" and twist the wirenut. I never did trust that type of connection and always tightly twist them before inserting in the nut, otherwise you are expecting that little steel spring inside to conduct the current of the joint.