OK, as long as the spliced-in piece is of a gauge AT LEAST as heavy as the original wire, so that it doesn't cause an increase in line resistance.
Also of importance is the method by which you make the splice. Crimp type splices are commonly used, but I prefer a linesman splice, soldered, with shrink tubing insulation.
https://professoralexandrebelinski.files.wordpress.com/2013/02/western-union-or-linemans-splice.jpg
Oh yeah, don't forget to slide the shrink tubing onto the wire BEFORE you twist the wires together. I never forget that step.... ;0
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