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"Near 3D" function ran for 16h 50m to find distance and angle for ≈300,000 points. Looking into an alternative using ArcScene to create a 3D feature exported by changing the power line symbol to "3D Simple Line Symbol" with style set to "Strip" + width value. This has created a 3D plane (multimatch).
Instead of creating a 3D plane to find vegetation points that are below or above the electric power I have begun testing the "Near 3D" functionality that will give the the angle value of nearest line to the vegetation points being examined.