Don't get caught up in all the fancy terminology. It's basically two 120V supply lines installed separately at the outlet and operate independently of each other. See photo. This should be basic 101 for any electrician. I've heard the horror stories of this type "electrician" wiring a 50A service pole but does it just as if he were wiring it for a 220/240 dryer or such. The minute you plug into it...you blow your entire electrical system out. If he can read, show him this picture. It requires a 6/3 with ground cable...4 wires total.
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