GE IC693ALG220 controller

Effects on conductors in contact with the soil. For conductors in contact with the soil (i. e., buried bare conductor), the current at any observation point is determined primarily by coupling within one skindepth of the observation point. Current induced at points farther away is so strongly attenuated by the soil that it adds little to the total current at the observation point. d. Effects on vertical structures. The EMP interacts with vertical structures, such as radio towers, waveguides, and cables to overhead antennas, and downleads from power and communication lines in much the same manner as it interacts with horizontal lines, except that it is the vertical component of the electric field that drives the vertical structures.

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