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Computer modeling may be used to accurately model an IEEE Std C62.41.2-2002 Combination Wave surge generator and apply the simulated surge waveform to a modeled system to determine the system's immunity to surge voltages. During the simulated surge tests, the designer can verify the suitability of the selected components, and, if necessary, judiciously perform a re-design at low cost and with little time expended. Furthermore, the designer can also observe the magnitude of the stresses imposed on the components by the simulated surge and thus determine the magnitude of the component voltages and currents, including dv/dt, di/dt, and the ringing frequency, thus allowing the designer to fully evaluate the adequacy, reliability and safety of the designed system. The authors evaluated a surge generator model published in an IEEE paper in 2005 and determined that the model was inaccurate. Consequently, a new surge generator model was proposed. The novel features of this enhanced surge generator model are demonstrated for four different simulation runs, using an electronic circuit with an L-C input line filter. The four runs include two operating conditions: a) with a surge suppressor in the circuit and b) with the surge suppressor open- circuited. The connected load includes: 1) a motor load and 2) a resistive load.