BS EN IEC 60034-30-3:2024

1   Scope

  This part of [IEC 60034](/search?q=IEC%C2%A060034)
   specifies efficiency classes for fixed-speed three-phase high-voltage cage induction
  motors in accordance with [IEC 60034‑1](/search?q=IEC%C2%A060034%E2%80%911) that 

   
      
         

• have a rated voltage exceeding 1 000 V, but not exceeding 11 kV;

• have a rated power from 200 kW to 2 000 kW;

             NOTE 1  Motors with rated power above 2 000 kW are produced in such small numbers and are
              designed and produced with a focus on achieving an optimum efficiency anyway, even
              though fulfilling increasingly special requirements that assigning efficiency classes
              would be an additional effort without the result of any countable energy saving. 
         
      
      
         

• have two, four or six poles;

• are rated for single-speed line-operation;

• are intended for direct-on-line starting at rated or at reduced voltage and rated frequency;

• are constructed to any degree of protection;

• are designed for cooling methods IC411, IC511, IC611, IC01 or IC81W;</di...