This International standard specifies the parameters for eight designs of starting performance of single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with IEC 60034-1 that: " have a rated voltage up to 1 000 V; " are intended for direct-on-line or star-delta starting; " are rated on the basis of duty type S1; " are constructed to any degree of protection and explosion protection. The standard also applies to dual voltage motors provided that the flux saturation level is the same for both voltages. The values of torque, apparent power and current given in this standard are limiting values (that is, minimum or maximum without tolerance), NOTE 1 It is not expected that all manufacturers will produce machines for all eight designs. The selection of any specific design in accordance with this standard will be a matter of agreement between the manufacturer and the purchaser. NOTE 2 Designs other than the eight specified may be necessary for particular applications. NOTE 3 It should be noted that values given in manufacturers' catalogues may include tolerances in accordance with IEC 60034-1. NOTE 4 The values tabled for locked rotor apparent power are based on r.m.s. symmetrical steady state locked rotor currents; at motor switch on there will be a one-half cycle asymmetrical instantaneous peak current which may range from 1,8 to 2,8 times the steady state value. The current peak and decay time are a function of the motor design and switching angle.