Misuse or improper and unsafe placement can pose significant accident risks. The Occupational Safety and Health Administration (OSHA) ladder and ladder safety requirements include:nManagers and supervisors must always ensure ladders are in proper working order.nDamaged or flawed must be removed from service and labeled “Dangerous, Do Not Use.”nPortable step ladders must be less than 20 feet, single ladders less than 30 feet, and extension ladders less than 60 feet.