Wire preference - stranded or solid

[kstl99]

I am glad to see that all are agreeing with stranded. Solid can break with vibration, metal fatigue I believe it is called. Also, screw and crimp terminations work much better with stranded, which is why you should not tin wires before crimping or using in a screw terminal.

Lastly, 90 degree bends with wire are a bad thing. They can cause the wire to crack inside. Most wire has a minimum bend radius as part of its specs. Better to loop into a connection if possible, avoiding stress on the connection.