Electrical steel strips are functional materials employed to enhance the efficiency of motors. The rotor design incorporates small bridges that are critical areas susceptible to failure. For the fatigue assessment of those bridges both statistical size effect and dynamic support effect has to be taken into account. Stress-controlled tests are conducted on NO30-15 using unnotched specimens of varying sizes as well as notched specimens. The material exhibits significant statistical size and support effects. Various methods for determining the Weibull exponent are evaluated based on these test results. By applying concepts of material-mechanical support effects, it is shown that determining the Weibull exponent in the limit lifetime regime results in strong agreement between theoretical predictions and experimental data.