Deep well submersible pump motor cable heating and pressure drop two factors equipped with power cord specifications. A constant current density is controlled to limit the temperature rise of the cable, in addition, the longer the length of the cable, the greater the voltage drop, through the cable, the start of the motor, operating performance and higher reliability of the use. Deep well submersible pump motor cable heating and pressure drop two factors equipped with power cord specifications. A constant current density is controlled to limit the temperature rise of the cable, in addition, the longer the length of the cable, the greater the voltage drop, through the cable, the start of the motor, operating performance and higher reliability of the use. Therefore, the submersible motor for the same well is equipped with a submersible pump head in a different way, with different cable lengths, and different cable sections are required. According to GB/T2816 "deep well submersible pump" standard, water temperature is 25 ℃, rated current, cable voltage drop should not exceed 5% of rated voltage. Therefore, the power supply voltage is 380V. For submersible motors with different power, the maximum cable length allowed by certain specifications is different. When the power supply voltage is higher, more stable or relatively large capacity power transformer, voltage and higher, more stable, the well submersible motor is equipped with the same specification of cable running length according to its specific situation appropriate length (or equipped with cable cross section appropriate reduction to reduce the cost of cable configuration). When deep well submersible pump head high, the motor go deep, with cable length is longer, but it is the poor quality of the power transformer, motor starter is very difficult: starting current is big, long cable pressure drop is large, so the voltage of the motor is much lower, the starting current will increase, the pressure drop of the cable bigger starting torque is reduced, a vicious cycle, not only difficult to start the motor, forced start, can damage motor windings. It is better to increase the supply voltage of the transformer. In order to meet the special requirements of high water pressure, high length suspension physical and mechanical properties and other special requirements, the rubber formula of the cable is put forward to meet the special requirements of deep well submersible pump under normal electric power operation.