According to the national standard GB/T 2816 submersible pump well standard, the water temperature is 25℃, rated as the current, the cable voltage should not exceed 5% of the rated voltage.

The cable specification of submersible pump is determined by the heating and pressure drop of the cable. In addition to the need to control a certain current density to limit the temperature rise of the cable, the longer the length of the cable, the greater the voltage drop of the submersible pump cable, and the greater the impact on the starting performance, operating performance and reliability of the motor. Therefore, for the motor with submersible pump in the same well, when the submersible pump head is different and the length of the cable is different, the requirements on the cable section are also different.

According to the standard of well submersible pump, when the power supply voltage is 380V, the maximum allowable length of submersible pump motor is the same as a certain power line. When the power supply voltage is higher and more stable or relatively large power transformer capacity, the higher the voltage, more stable, Wells with submersible pump motor is equipped with the same specifications of the cable allow depending on the specific situation to the appropriate length (or the cable is reduced, in order to reduce the cost of cable configuration), the maximum allowable length of submersible pump cable installation of submersible pump motor has a regulation.

When the submersible pump motor, according to well depth, along the cable length is longer, the poor quality of power supply transformer, motor start-up difficulties: starting current is very big, long the pressure drop of the cable, reduce the voltage of the motor, the starting current is added, submersible pump cables of the pressure drop is larger, lower starting torque, create a vicious cycle, motor start is difficult, not only forced to start may cause damage to the motor windings. Therefore, each submersible pump must be equipped with submersible pump cable as required.