Hello there and welcome to Just Answer. My name is XXXXX XXXXX I will be assisting you today. I am an engineer with over 30 years of electrical and electronic training, repair and installation experience. I will try and answer your question accurately and precisely so that we can get you on your way.
I need some additional information from you in order to fully understand the situation.
Your single phase 220V plug, how many terminals does it have?
Please let me know so that we can continue.
The single phase plug is a twist lock 20amp with 4 terminals. The terminals are labeled W,X,Y,Z. The 3 phase recepticals are twist lock 30amp with 4 terminals labeled G,W,X,Y
Since these are likely for the Canadian market, do you see any markings on the plug that may indicate the type. For example do you see anything like 10-30L or 6-50L anywhere on the receptacle?
Don't see any such markings like that anywhere
Ok, take a look at this page and tell me which receptacles you have there: http://www.nooutage.com/nema_configurations.htm
Ok, the 14-20W is not a three phase plug. It is a 120/240 single phase receptacle that will be fed from a double pole breaker in a 120/240V panel.
G - Ground
W - Neutral (White)
X - Hot
Y - Hot
X and Y are interchangeable. It matters not which hot wire goes to which.
For your three phase receptacle, this should be fed from a three pole breaker in a three phase panel board.
G - Ground
Z - Hot
Again, it does not matter which hot goes to which pin UNLESS the device has a specific rotation - like a motor - and it is rotating backwards. To remedy this, simply swap any two of the three hots around.
I'll be here if you need further help with this issue. Please let me know.