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

The specification of submersible pump cable is determined by cable heating and pressure drop. In addition to controlling a certain current density to limit the temperature rise of the cable, the longer the cable length is, the greater the voltage drop of the cable is, and the greater the influence on the starting performance, operating performance and service reliability of the motor is. Therefore, when the submersible pump motor is used in the same well, the submersible pump head is different, the cable length is different, and the cable section is different.

Submersible pump cable according to the standard of submersible pump for well, when the power supply voltage is 380V, the maximum allowable length of submersible pump motor varies with the power and has certain specifications of cable. 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 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 submersible pump cable pressure drop is big, reduce the voltage of motor starting current is added, the pressure drop of the cable 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.