I've been using nuts for lever wire for a while. I love her. They work with stranded wire as there is no resistance on the wire until the lever is lowered. They can also be reused - I don't have to worry about the union nut coming loose. I also like the fact that they come in a variety of sizes from two wires and up. They're a little more expensive and if I'm just wiring around the home I use them leverless, but utility room or stranded wire - these work great.
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