Push-in Wire Connectors Stranded Wire Soldering
Hi, I am an average homeowner with basic knowledge of home wiring. I've done some of the wiring in my house and have been doing basic home wiring for at least 4-5 years. My question is concerning the Push-in wire connectors and stranded wire. I've always found the wire nuts to be difficult to handle and the whole debate about pre-twisting or non pre-twisting to be mind boggling. I can make a good connection using the wire nuts, but I prefer to use the push-in connectors. I trust them more, and I've had great success with those using solid wire (14awg and 12awg). These connectors are rated for stranded wire (20awg - 14awg), but every time I insert a stranded wire only a few strands go under the locking mechanism. I've tried spinning the stranded wires clockwise with my fingers to stiffen the wire, but the wires still spread when I insert them into the push-in connector. The rest do touch the metal part of the connector by building up in the shape of a ball. However, I have been looking for a better way to do this. I tested out a soldering technique where I used my Weller 40w station to heat the wire up and apply a small amount of Rosin Core solder (60/40) to the very tip of the stranded wire. This seems to hold the strands together so that the wire goes into the push-in connector just like a regular solid wire. My question is, is it o.k. to apply solder to the tip of the stranded wire to hold it together? What does the electrical code say about this? Also, is it o.k. to use this some technique with wire nuts?