ive got a question then, why do you need to change the plug?? if the cord will handle the 240v, wouldnt the plug be able to handle it as well? its rated to handle 120v from the hot to ground, it should be able to handle the other 120v on the neutral/white side as well. Its not like your feeding 240 on just one side, your spliting it on each of the 2 sides of the plug.
for example, you can have the black as one leg of the hot, 120v
the white as another leg of hot, 120v
the green as the neutral/ground
the only thing you need to make sure is that you hook the white to the other leg that the black wire is, on the 240v main.
the wires in the house are rated at 600v, so there is no problem there.
you just need to make sure NOTHING else gets hooked up to the outlet
or you will really have some nice sparks
Bookmarks