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Wait a minute, is the cute knot the ONLY thing connecting and holding the two wires together? NO. Solder it! Otherwise, vibration and heat/cool cycles will almost certainly work the knot loose and allow corrosion to form on the mating surfaces, resulting in a high resistance joint. Also, I wish people would stop showing the shrinking of heat shrink tubing with a match (Or any open flame)- use a heat gun unless you like black soot, sagging, charred insulation and surprise fires.
I see the knot splice appears to not be a favorable splicing technique, but I'm not seeing why. Enlighten us naive folks! Seems to me like it would resist being separated. Is there just too much chance for air gaps between wires?I just don't want o have to solder everything. I don't have a garage, and I just get lazy pulling all these tools outside, so I'd rather deal with a nice, tight knot or a PosiTap.
We have in excess of 300 electricians at work and I doubt that any of them have ever used this technique for splicing wire. That is what junction boxes are for. Tying wires in a square know, pulling tight and then sliding a bit of shrink tubing over it might be okay for low voltage wiring but not for home power wiring. Honestly with the invention of Posi-Taps if you spend a few dollars, you'll get a far superior product that is removable and reusable if reconfigure accessories. I cringe every time i get a new to me bike and see all the wiring techniques used by the shade tree 12v electricians using cheap connectors from the $4 variety pack picked up at the local auto parts store. Usually, the 1st thing I do is rip all this goodness out and redo it properly with quality connectors.Here's a bundle of joy I removed from a bike I bought a year or so ago. If they would have knotted all the splices it would have looked like a macrame plant holder.