Andy Wade wrote:


MK are right; tinning the ends is very bad practice. If you want tidy
wire ends use crimped bootlace ferrules, or crimped ring terminals as
appropriate.


Dead right. The reason some wires come pre-tinned (and plugless in some
cases, equipment construction regs notwithstanding) is that it makes
final test easier for the manufacturer. Tinning the ends uses kit
already in the factory, at minimal consumables cost too compared to a
bootlace or similar. Popping the non-straggling tinned ends into a
spring-loaded source of 240VAC/110VAC is quick'n'easy (no whiskers of
cable to cause shorts). Cutting off the tinned ends is an extra process
which the volume contract manufacturers won't undertake unless
explicitly told (and paid) to do so...

Stefek