The purpose of this SAE Recommended Practice is to establish the minimum performance requirements of devices which signal and/or automatically prevent two-blocking. This SAE Recommended practice applies to cranes in lifting crane service which are equipped with two-block warning and/or limit systems.
This recommended practice specifies criteria for steps, stairways, ladders, walkways, platforms, handrails, handholds, guardrails and entrance openings which permit access to and from operator, inspection or maintenance platforms on mobile cranes parked in accordance with the manufacturer’s instruction. It also presents requirements for guards and restraints as related to moving parts.
This SAE Recommended Practice applies to mobile, construction type, crane and cable excavator hand and foot controls. It should not be construed to limit the use of, or to apply to combination controls, automatic controls, or any other special operating control requirements.
This SAE Standard applies to cranes which are equipped to adjust the boom angle by hoisting and lowering means through rope reeving. The purpose of this standard is to define the function and to stipulate the requirements of an automatic device to prevent raising a variable angle boom above its highest specified angle.