Ah okay that makes sense. Essentially a good 8 foot stick would have a max of 525kv if each foot is rated to 75kv, since the 8th foot would would hit the end? Not that an 8ft stick is used on that high of a line but just thinking max it could insulate from.
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Exactly, testing at 75kv per foot leaves plenty of room for error if a portion of the stick was to get damaged or dirty. Plus we have a Minimum Approach Distance we have to go by also.