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Winder. Worthy of note is that lightning protection and grounding Winder Unlike civil aircraft grounding on the grounding location should be away from the control room at three meters in outdoor floor 1.5 meters in diameter 20 mm galvanized angle for vertical grounding, grounding quantity to meet the grounding resistance less than 1 ohm (application shake table testing backfill), and then using 40X40X4 galvanized flat steel and grounding reliable welding (welding points each need to do careful rust treatment), to