Cal/OSHA Won’t Knuckle Under on Articulating Boom Cranes – No Exemptions

What's the difference between articulating boom cranes (also known as knuckle booms) and telescoping cranes? Not enough to justify a temporary exemption from operator certification requirements, the agency said. But crane industry members say the differences are enough to cause a crane to topple if the operator isn't trained correctly, the reason for the petition.