R614-7-3. Cranes and Derricks

Related Notices

Latest version.

Two Blocking Damage Preventive Feature. On hydraulic cranes with power telescoping booms, an "Anti Two-Blocking" feature, warning device, or other arrangement, shall be provided to warn the crane operator to avoid colliding ("two blocking") the hook block with the boom point when hoisting the load, when extending the boom or when booming up or down.

                    
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