I hope this isn't too far off-topic...
I do wish my NEMA 5-15 adaptor had more than 18 AWG! A 18 AWG IEC lead was all I had available though. I didn't even realise that until I cut and stripped it, the outside diametre is roughly equal to H05VV-F 2.5 or at least 1.5!
In vector drawings I've made in my spare time, SJT 18AWGX3C gets an outer diameter of 7.36mm, versus:
7.01mm for H05VV-F3G1.0
8.27mm for H05VV-F3G1.5
10.04mm for H05VV-F3G2.5
However that's not including the fabric lining still common (though by no means universal) in American cords, with which I could see it approaching the diameter of H05VV-F3G1.5 (though probably not 3G2.5).
Or if it's ST 18AWGX3C (though such a heavily-sheathed cord seems an unlikely combination with IEC 60320), that's 8.88mm diameter in my drawing.
