Crane warning devices

Cranes may have built-in safety devices or warning devices. One type of device is a load indicating device (LID). It measures load weight and displays a reading for the operator. It may include an overload warning signal if a load exceeds some predetermined weight. 

Proximity Alarms At this time, because no current proximity alarms meet the NRTL requirements as stated in the 1926.1401 definition for proximity alarm, employers may not rely on any proximity alarm to comply with the requirements in 29 CFR 1926 Subparl CC. However, if a Compliance Safety and Health Officer (CSHO) encounters a crane/derrick in construction using a proximity alarm in conjunction with a properly implemented additional measure such as using a dedicated spotter" or range control warning device from 1926.1407(b)(3) or. 1408(b)(4), then no citation is to be issued for violation of either 1926.1407(b)(3)(ii) or. 1408(b)(4)(i), including situations where voltages are over 350 kV as referenced in 1926.1409. 

Neither OSHA nor the ASME B30.2-2001 consensus standard for overhead and gantry cranes sets a decibel level for warning devices. 

A device fitted to a crane to provide the operator with automatic warning of approach to an overload situation. 

Workers near mobile cranes can also easily get run over if they don t pay attention— and especially if the operator loses sight of them. Operators should use an audible warning and operating signal device to notify workers of movement. Workers should stay out of the way of the load as well as the crane and outrigger wheels. If the operator has a limited view, a qualified signals person should direct and communicate the operations. 

A) Lattice boom cranes manufactured after Feb 28, 1992, must be equipped with a device that either automatically prevents damage and load failure from contact between the load block, overhaul ball, or similar component, and the boom tip (or fixed upper block or similar component), or warns the operator in time for the operator to prevent two-blocking. The device must prevent such damage/failure or provide adequate warning for all points where two-blocking could occur. 

Some of the options involve proximity alarms or insulating links/devices. Effective November 8, 2011, Subpart CC at 1926.1401 defined proximity alarm and insulating link/device as devices that warn of proximity to power lines or that insulate against electricity and that have been ...listed, labeled or accepted by a Nationally Recognized Testing Laboratory in accordance with 29 CFR 1910.7 ( NRTL requirements ). These pieces of safety equipment must meet the performance requirements and the NRTL requirements as defined in Subpart CC at 1926.1401, Definitions, to be used on cranes and derricks in construction. 

Only fully inspected and properly maintained equipment should be allowed on site. This applies to power shovels, concrete mixers, supply trucks, cranes, materials handling devices, power tools, and other construction equipment. Great care must be taken to avoid collisions of mobile equipment with production equipment, pipelines, power lines, staged materials, or other objects or hazards. Specific measures include the use of permit programs, warning signs, personnel training, site reviews, and careful supervision. 

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