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MATERIALS HANDLING AND STORAGE |
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Overhead and Gantry Cranes - Electrical Equipment |
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| All wiring and equipment on overhead or gantry cranes shall comply with the
applicable electrical sections of Subpart S. The suspended push-button station shall be supported in a manner that will protect the electrical conductor against strain on floor-operated cranes where a multiple conductor cable is used. This condition can be abated simply by installing a chair or cable from an upper support to the push-button station to take the strain off the conductor. Pendant control boxes shall be clearly marked for identification of functions to prevent confusion and unwanted crane movement. Only designated personnel are permitted to operate a crane per standard 1910.179(b)(8). The hoisting motion of all electric traveling cranes shall have an over-travel limit switch in the hoisting direction. A "limit switch" is a switch which disconnects the power to the drive motor and stops the load if that load is raised above a certain point. All inspections of an overhead crane shall include an inspection of the limit switch. If a limit switch is not provided, or if there is a malfunctioning limit switch, the hoist block could run up into the lifting beam or rope drum, severing the cable and dropping the entire assembly and any load on the hook to the floor below. |
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