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.

KEY: safety

Date of Last Change: February 22, 2010

Notice of Continuation: June 24, 2022

Authorizing, and Implemented or Interpreted Law: 34A-6