According to OSHA studies, most LOTO-related accidents involved moving machinery. The primary causes of these types of incidents are:
Equipment not completely shut off before a maintenance or repair operation was performed
Machine turned on accidentally, either out of carelessness or by one worker not realizing another worker was in harm's way
Machine not working properly
Moving equipment wasn't properly chocked/blocked
Inadequate safety procedures
LOTO procedures had not been properly explained to workers