Being a Leviton product, one might suppose it is the industry standard. Nevertheless, the connectors on the plug I got would not cinch tight on #10 stranded wire, which should be a very common wire type for this application (and apparently among the gauges the plug is designed for). I had to bend two ears on each terminal to get an improved fit when the terminal was screwed down tight. This took care of two of the three prongs, but it was still easy to pull the wire out of the terminal on the third prong. Unfortunately the third prong was the one that required some persuasion to force it into its proper position (the other two went in quite easily), and the wire kept slipping out.After enough fussing it all went together, looks good, and works fine; but I was surprised by the hassle.