Tinning electrical wires can turn stranded wires into solid wires. Soldering wire strands, often called tinning, is the way the professionals ensure that wires strands don't fray and separate when the terminal is tightened down on the wire. By using a soldering iron to add rosin-core solder to the wire strands, the solder fills in the voids between the wire stands and causes the loose, fine wires to become one solid wire that can be easily bent and placed underneath the terminal screws. This ensures a tight connection and virtually eliminates the possibility of loose strands touching the junction box or coming out from beneath the terminal screw. Here's how to successfully tin wire.
...Source: http://electrical.about.com/b/2013/07/08/call-the-tin-man.htm
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