So, what's the problem? That's what multimeters are for! It's because of little matters like that that these things are best left to people who know what they're doing (ie, us), and not meddling amateurs! smile

UK mains plug wiring:-

Brown - live
Blue - neutral
Green with yellow stripe - protective conductor ("earth")

USA mains plug wiring:-

Black - live
White - neutral
Green - protective conductor ("earth")

If you don't inspect ... don't expect.