What should be done before climbing a tower that supports electrically powered devices?
Notify the electric company that a person will be working on the tower
Make sure all circuits that supply power to the tower are locked out and tagged✓پاسخ درست
Unground the base of the tower
All these choices are correct
توضیح
Any circuit feeding equipment on the tower is a source of energy that could be re-energised while work is in progress, so those circuits are de-energised, locked in the off position and tagged before the climb. Ungrounding the tower base would remove protection rather than add it.