So, I was looking at getting me a good amount of general cable/wire for in the lab - 10 meters or so of various colors and guage. It is hard when shopping around not to notice the quite cheap sources in china. Ofcourse, it will likely be not as good as it claims (not meet its ratings in terms of voltage and such) but it seems like a good source for a first purchase, considering the high cost from local sellers.
Anyone have experience with chinese sources? Did you like what you got? Or perhaps other sources of cable I should consider?
I have tried some cheap ones, they are not of the standard expected resistivity.
from "good" cable catalogs, i made some calculations as copper resistivity is a known constant. Most good cables have resistivity around 17.6 to 21 nano-ohm.m depending on stranding. finer strands = lousier.
the majority of the crappier china cables are over 28, some "shop" do seem to publicize actual resistivity spec of good cables at around 19 to 21 n-ohm.m, but i have yet the chance to try those.
And all of those which i found to say they have the right resistivity numbers, are selling hardcore cables for welding and pure copper braids (4mm to 25mm ++ stuff). i would say 9 out of 10 do not state specs.
very few sellers claim to be "guo biao" or china standard and also state ohm/km which result in correct nano-ohm.m, these which i stumble upon are also marked as "AGR" standard (silicone). branded means nothing, eg : AMASS cables for RC are not all proper, the higher gauges seem correct in resistivity (AWG 6 or less), but the smaller gauges have the "lousier" resistivity worse than 28, some reaching 34n-ohm.m. so it also casts some doubt if every spec featured is real or fake? so in general, id say 19 out of 20 do not state specs or have poor specs.
i use a small test batch of AWG 18 at 31n-ohm.m, i find the 18AWG silicone fine strand cables to be still useful and good resistance to soldering heat. so i think the application vs cost is going to need some weighing, they are worth it in non-critical areas.
i think most connection cables are rated 80C, these are grossly unsuitable for soldering. so those cheap china poor resistivity silicone cables are where they do well, no shrink no melt even when your fingers get burnt and i managed to re-use them again and again.