Functions: power cable is used to transmit and distribute large functional electric energy in the mainline of power system; control cable is used to control the wiring of electrical equipment. 2. Categories are different: power cables belong to the second of the five categories of cables; control cables belong to the third of the five categories of cables (cables for electrical equipment) according to China National Standard 3. The identification of insulated core:  the insulation of power cable generally adopts color phase separation; the color of insulation of control cable is generally monochrome printed digital serial number.