In the event the raise for what ever reason is ever away from stability, quite a few sensors will detect this and stop the raise from travelling. Pedestrian boundaries are typically set up at heights of 1150mm to 1350mm over ground and with posts spaced every single 2m. In advance https://claytonfwftj.blogdiloz.com/33661748/the-smart-trick-of-fence-company-that-nobody-is-discussing