A person selected or assigned by the employer or the employer’s representative as being competent to perform specific duties.

See Chain, welded link.

Totally enclosed fan cooled, motor type.

Distance from center-to-center of outermost wheels on a trolley or end truck.

A wheel with formed pockets on its periphery to allow torque to be transmitted when a force is applied to the hand chain.

The loss of voltage in an electric conductor between supply tap and load tap.

A method of control by which the motor supply voltage and frequency can be adjusted thereby allowing for controlled acceleration and deceleration of the driven hoist, trolley or bridge.

Condition under which the load block or load suspended from the hook becomes jammed against the crane structure preventing further winding up of the hoist drum. This is a very dangerous condition and can result in the hoist motor pulling the rope until it breaks, dropping the load.

A hoist and trolley unit consisting of a hoist suspended from or mounted to a trolley, or a hoist with an integral trolley.

In true vertical lift, the load hook travels in an exactly vertical path between the lower limit and the upper limit of lift.