How to determine the cable size for electrical Motors

Feb 03, 2019

The cable size selection method we want to describe is based on the following three conditions


 In cable selection, it is assumed that the length of the cable is Max. 50 meters

The ambient temperature is 25 C

Type of cable is NYY

To determine the cable size for different electrical motor powers, we first divide the motor startup type into two general categories, then use a separate table for each group to select the cable size

:(First Group (Table 1

(Direct On Line (DOL

(Soft Starter (SSD

(Variable Speed Driver (VSD

:(Second Group (Table 2

(Star-Delta (SD




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The cable size selection method we want to describe is based on the following three conditions