Response to Hello Youssef.   Motors are rated for 10% over or under the nameplate voltage listed on the motor.  This is a NEMA (National Electrical Manufacturers Association) requirement.  A 230 volt motor can operate as low as 207 volts.  A motor rated at 208/230 volts means the motor will operate at the 208 volt rating, not 10% under the 208 volt rating.  Motors that are truly intended for 208 volts are nameplated for 200 volts.  Such a motor rating would allow the minimum voltage to be 180 volts.

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