JimB, Nigel
Thanks for the replies.
"2 No and No. Not sure where you got this idea from". I don't mind telling you.
I went looking for some cable to do a bit of re-wiring on a motorbike. Normally, I just use whatever looks heavy enough and leave it at that but in this case, it's for the charging circuit and I thought I'd make sure I got as close to the existing stuff as possible (37 x .2mm)
In at least 2 shops I went to, selling nothing but cables for lighting, heating, electronics, I asked if they could tell me what maximum current a particular wire could take, I was asked, "AC or DC?". When I said DC the bloke told me, "Ah. DC. then this is no good. AC is ok but not DC it would need to be heavier". I have to say this was the first time I'd heard of this.
When people are emphatic and seem so sure (they're in the business of selling the cable after all), I tend to assume they know something I don't. I thought well, AC changes direction 50/60 times a second, so maybe it doesn't need to be such a thick cable as for DC for a given voltage/current. I'm a muppet, I know.
So, does this mean then that a 15A CCC cable will take 15A whether it's AC or DC?
In the end I got a 70 x .19 which, I hope I'm safe to assume, is thicker, has a lot more copper so it should have a higher CCC than the one I'm replacing.
Thanks again and sorry for the ramble.
Trevor