353. It is prohibited to step onto the track of a travelling crane or carry out work thereon unless one of the following conditions is met:(1) the main switch of the travelling crane is padlocked in the open position by the person who is to go onto the track, in order to avoid any accidental start-up of the travelling crane;
(2) the operator of the travelling crane is informed of the presence of a worker and the travelling crane cannot approach closer to him than 3 m (9.8 ft).