Hi, No, it would not make a difference (or at least a very tiny one - it might change the coupling between the primary _leads_ and secondary _leads_ but it would not change the coupling between the primary and the secondary coils, and the coupling between the coils will be far, far larger and more dominant than the lead to lead coupling). For a toroidal transformer all that matters is the number of times that a wire passes through the middle (hole). The situation which is less clear is when you have a core that has more than one opening in it, like an E-I core in a transformer. In that case, fractional turns counts are possible depending on how the wire passes through the two openings. Sean On Sat, Jan 19, 2013 at 2:01 PM, KPL wrote: > Hi, > > I have ordered some current transformers, to measure average current > in AC line. > http://docs-europe.origin.electrocomponents.com/webdocs/0f47/0900766b80f4= 7965.pdf > > I know usually power wire is just run through the core, but would it > make any difference, if that wire made actually a full turn around the > core, with ends crossing outside, not running through it twice? > > -- > KPL > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .