My brother does appliance installation. In the USA there is two 
standards for wiring appliances. One is when they are installed in a 
frame built home and another when they are installed in places like 
mobile homes. In frame built homes the plugs are 3 pronged. The outer 
two connections are HOT (red, black) at 120V each or 240V between the 
two and the middle is neutral (white). Ground (green) of the appliance 
is tied to this same neutral. In a mobile home a 4 pronged plug is 
required, where the outer two connections are still HOT (red , black) at 
120V but the neutral (white) is not connected to the frame and the 4th 
prong (green) supplies an extra ground which connects to the metal frame.

If you look on something like a electric dryer where the connections are 
you will find a metal tab that can be connected to the center neutral to 
bond the frame to the neutral wire if installed in a home. When 
installed in a mobile home that tab is removed and the green wire is 
attached to the frame.

Good Luck
Mark





PICdude wrote:
>
> FWIW, I opened the outlet, and the three wires are green (tied to the  
> back of the case), then red and black.
>
> So I'm confused as to what to do now.  I don't mind getting an outlet  
> wired in here, but need to test this thing in the next few days before  
> my DOA warranty runs out.
>
> Not sure where else I can find 220V to test this.
>
> Cheers,
> -Neil.
>
>
>
>   
>
>   

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