Sandro, 50 hertz is usually used in Europe, Asia, Africa and parts of South America (Argentina and Chile, for ex.).
I don't know where it would be used here in North America and the northern part of South America (Colombia, Venezuela, Ecuador). I think all power companies in this area generate 60 hertz.
Wonder why the wiring would be different...probably something internal with the equipment you're wiring? A frequency dependent component like a timing chip, perhaps?
(puzzled)
