A finite length insulated wire lying at the earth-air interface is modeled using a transmission line approach. Transient response to a double exponential incident pulse with 10 ns rise time is obtained for various incident polarizations, cable lengths, soil conductivities and termination impedances. Characterizing all cases, the induced current pulses peak at approximately (3 to 20) amps/kv with rise time approximately (.1 to .2) musec. A simple bare wire surface cable model current estimate is shown to be in good agreement with results from a more sophisticated model of a wire near the ground plane. (auth)