I have taken the plug off a machine I bought from Europe with me when I moved to Canada. I know we use a different current system here so I decided to buy a plug and wire it myself. The problem is the wire colours are also different here in Canada than the wires used in Europe. The three colours are Red,Black and Grey. Can someone please tell me which colour wire is the ground wire, which one is negative and which one is positive.
Thanks

You might wish to consider the following:

The reason the plugs are made differently is to prevent people from using electrical equipment on incompatible systems. There are more differences in the equipment than just the plug. By changing the plug, you are defeating the safety mechanism the engineers chose to use to keep you from blowing yourself up. By simply changing the plug, you stand a grave chance of blowing yourself up. What you're doing is a very, very bad idea.

- Warren

chroot's right as usual.
So please post a photo of yourself,with all your hair standing on end & burnt fingers etc when you try anyway.
:D

European voltage is higher, it wont work. Get an adaptor

What is the voltage in Canada?
In the UK its 250 volts,but most of the EU is 110 volts or at least it used to be.

Voltages do very, but you also have to worry about the Hz rating, our appliances run on 60 cycles , other countrys use 50 cycle per sine wave . we call that dirty power (slang term). red & black are your hot legs, gray SHOULD be your ground. if you can trace the conductors you might find the gray wire bonded to a lug on the frame of the appliance, trace the other two they should lead to a insulated block with the same color of wires running to it. but you still should not try this, you can get hurt or even kill yourself. I just dont want to see you dammage a good appliance.

Check the voltage rating on your appliance (it will either be in the manual, or written on the appliance itself). If it is different from the mains Canadian voltage (anybody know what that is?) then don't try to plug your appliance into the Canadian mains.

Put the wrong voltage through it, and you'll fry it. Put the wrong Amps through it, and anything could happen. Here in Australia I think our AC is on 50, not sure. Replacing the plug and wire does nothing; all they do is transfer the power from the socket to the device. You need an adaptor which alters both current and voltage to suit your device.

I forgot to mention that if your trying to change the voltage from 240v to 120v it can be done, on older appliances it didnt matter which side the power came in and which side it went out . but on more modern appliances you have to have the right polarity. so if your trying to go from 240v to 120v you might have a hard time. look at your schematic. if you are staying on the same voltage, then dont exceed your amp rating.also a 50 cycle appliance will run hotter and have a shorter life running on 60 cycles. and might disrupt the computer componets

America uses 60 Hz power somewhere between 110 and 120 volts. continental Europe uses 50Hz, and somewhere between 215 and 230 volts. You can probably get a transformer that will let you use your appliance, but watch the wattage. Some appliances are dual, or adjustable voltage. Most computers have a switch on the power supply, and some appliances automatically switch. Like James said, check the manual.

Thanks to all who replided to "Currents". I took all the advice and low and behold it worked. I should have told you it was a table mounted drill. Works like a charm .