I had a licensed electrician install this circuit with NEMA 14-30 receptacle before I knew which specific appliance would be used on the circuit. I now have the appliance with a 14-30 plug, but it warns:
This is a single-phase device. Do not connect all three
phases of a 3-phase feed !!! You may use any two phases of a three- phase wye-transformer feed. The center-point of the three phases (usually used as Neutral) must be grounded somewhere in the system. A Neutral connection is not required by the LCS. Only Line 1, Line 2, and Ground are required.