move_rope entity and multiple keyframe_rope entity
make the move_rope(at the start of the rope/wire) and set it's next keyframe to the name of the next keyframe_rope entity. Have as long a chain of keyframe_rope entities as you want.
set the slack to something around 90-110 to look best
you can also change the width, but 2 usually looks good for power lines in the distance
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