Just purchased a variable speed motor (10A max), and decided to completely re-wire from the house to the pool. Old switches and receptacles were rusty, etc and seemed like a good time to upgrade everything. Running 10-gauge wire out to pool inside pvc conduit the entire length. Would like to install a plug end on the pool motor instead of hard-wiring, so I can easily remove pump/motor assy for the winter here in CT. Using a US MOTORS/EMERSON ECOTECH EZ #EVSJ15-NS Variable Speed Motor wired for 230V. Motor only calls for 3-wire connection (L1-black, L2-red, and Ground-Green). However, when I look at 30A and 50A receptacles, appears latest code (after 1996) calls for 4-wire receptacles and plugs for 230V appliances. I have a 4-conductor 10g wiring running from main panel to the GFCI enclosure on the house. Should/can I run 3 wires out to pool (eliminating white wire), install a 3-prong receptacle, and run a 3-prong plug-in from the motor. Or, should I run 4 wires out to pool, install a 4-prong receptacle, use a 4-wire plug on the motor, but just not connect the white wire? Don't want to run 4th wire out to pool, if it's not going to be used, and at cost of copper wire (x 60 ft), seems like a waste, unless req'd by code. And. . . if required by code, why isn't a brand new VS motor setup for a 4-wire connection? I am obviously mounting everything in weatherproof boxes (was planning to use 30A or 50A weatherproof enclosures from GE designed for outdoor RV hookups or weatherproof generator inlet boxes from Reliance Controls). Hoping some electricians chime in and can lend some guidance. Trying to wire and pick up parts this weekend, so any comments today would be greatly appreciated. Just want to do things correctly. Thanks in advance for your assistance.