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In this application is a switched outlet against the NEC? Aren't switched outlets commonly used to control table lamps?
It appears that you need a 4 wire cord with 2 hots. One hot to control up and one hot to control down. All wires need to be in the same cable or cord. Having the 4 wire cord rigged with 2 plugs and 2 switched receptacles will be a problem, since one cord will not have a neutral, and if one cord is unplugged when the other cord is in use then there can be back-feed current going out the other plug and will be dangerous if someone touched the plug. If it was to be plug connected then you need a 4 wire plug, but the 4 wire plugs are designed for different purposes (120/240 volt applications, 3 phase applications, etc.) and not for having the 2 different hots for motor control purposes.
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Re: Home Theater Projection Screen Wiring