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we all know the 26 AWG wires that come inside UTP cables. Those surely are flexible. But what a bout an AWG 15-16 such copper wire, is it flexible enough to use as feeding cable for the 12 V car lighter socket ?

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The problem with solid core wires is they are prone to breakage through repeated mechanical flexing. If your application has any moment of the cable, the wire could break after installation.

If you're fine with the risk of breakage than use it.

On a side note Solid UTP cables should not be used for the connection between your computer and the wall for this reason, only use stranded UTP cables. Walking on solid core UTP cables is also a great way to break them.

Another 'nother side not, as with all cables, make sure you properly crimp and strip the ends off of wires, any knicks or improper crimping can also fatigue the wire and cause it to break in the future.

This manual is a great resource for tips on how to handle wiring correctly. Student Workbook for Crimp, Cable and Harnessing

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  • \$\begingroup\$ Is there any calculator to relate flexing tolerance with the number (and diameter of) wire strands and bending radius? (shopping question :-( ) \$\endgroup\$ – Ale..chenski Nov 10 '17 at 20:07
  • \$\begingroup\$ @AndrewMorton too many late nights, I'll fix that \$\endgroup\$ – Voltage Spike Nov 10 '17 at 20:15
  • \$\begingroup\$ @AliChen No but that would be awsome if there was. I know just from handling the solid core wires are liable to breakage after tens of flexes. If you have stranded you are much much better off, they take much more abuse. \$\endgroup\$ – Voltage Spike Nov 10 '17 at 20:16
  • \$\begingroup\$ ugh, but I have never had a broken UTP wire in the middle; I break them from time to time when connecting them to some other wires, sure, and the computer uses exactly those thin solid UTP wires with tremendous success, and the stranded cable's individual strands are... about the thickness of the solid UTB wire :-/ \$\endgroup\$ – kellogs Nov 10 '17 at 20:30
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    \$\begingroup\$ @kellogs, you haven't broken the wires in middle because the bending radius in the "middle" is much bigger than near the connectors, where the most bending usually occurs. \$\endgroup\$ – Ale..chenski Nov 10 '17 at 21:03

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