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    Totally enclosed fan cooled.

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    A jib crane with a boom designed to extended and retract. Typically used in a containment building to access remote areas and polar crane maintenance.

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    Totally enclosed non-ventilated.

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    Positive temperature coefficient thermistor device embedded in a motor to protect against damage from high frequency starting, voltage fluctuations and frequency fluctuations.

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    An overhead traveling crane having the end trucks supported on rails attached to the top of the runway support beams.

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    The torque produced by a motor operating at its rated horsepower and speed.

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    Girder in which the bridge rail is located over one web.

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    Forces which can cause twisting of a member.

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    A single or double girder bridge crane running on two or more straight runway tracks with a hoisting system designed for lifting, transporting and lowering loads.

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    The unit carrying the hoisting mechanism which travels on the bridge rails.

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    The basic structure of the trolley on which are mounted the hoisting and traversing mechanisms.

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    As defined by the Nuclear Regulatory Commission: "A rotary engine made with a series of curved vanes on a rotating shaft, usually turned by water or steam. Turbines are considered the most economical means to turn large electrical generators."

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    A mechanism with a horizontal rotable inner frame with an inner frame. The inner frame can be rotated to align a section of track with other track for the transfer of loaded carriers from one track to another.

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    Condition under which the load block or load suspended from the hook becomes jammed against the crane structure preventing further winding of the hoist drum.