IEC 60034-6 Methods of cooling of electric motors (IC code)

The three most frequently used motor cooling methods have the following designations - IC codes according to the IEC 60034-6 standard IC 411, IC 410, and IC 418 are applied 

IC410: The motor is cooled by free convection

IC411: The motor is cooled by a fan mounted on the motor shaft 

IC 418: The motor is cooled by an air flow typi- cally coming from an external fan