What do you mean by "the grid live and not live"? Are you saying the grid is energized? If so, then it definitely unsafe. If you mean it was energized before connecting the ground to "drain" the power, then that is also unsafe, because if the ground is lost it will become live again. Ceiling grids are usually only incidentally grounded by contact with other metal objects if they are grounded. An induced current is seldom strong enough to "tag" someone.