Electrical Requirement Considerations.
Supply Voltage and Frequency
Voltage is defined in basic electric principles (Physics: Mr. Voltaire) 
as the potential difference that pushes a current in Amperes through 
a Resistance in Ohms. This Voltage can be a steady value or a repetitive  
waveform (square wave, sinewave, triangular etc)

Unit of the voltage is Volt (V). 
Frequency is the number of cycles that a voltage waveform 
repeats itself per seconds.

Unit of the Frequency is Hertz (Hz).
DC voltage is a voltage with 0 frequency in effect is steady at a  certain value.

AC voltage is the process in one cycle a voltage will change from 0  volts to a maximum positive value then back to 0 and over to the  same maximum but negatively then back to 0.

For example: 230V AC 50 Hz, means that the voltage waveform does the above cycle fifty time per second and swings between positive 230Volts and negative 230Volts.
The effective from incorrect voltage.

If motors are operated with a different voltage than specified, it can damage the motor and connected devices.
The effective from same voltage but incorrect frequency:

Case 1: You have 60Hz power for a 50Hz motor, the motor will run 20% faster and the motor output power will increase, a 10kW 50 Hz motor will be a 12kW motor on 60 Hz power supply then the motor current and winding  temperature will also increase, it will be overload.
Case 2: You have 50Hz power for a 60Hz motor, the motor will run 20% slower on 50Hz power supply This also results in 20% less power machine performance will also decrease.