1.) The National Association of Chain Manufacturers (NACM) defines Overhead Lifting
in the Welded Steel Chain Specifications
That process of lifting that would elevate a freely suspended load to such a position that dropping the load would present a possibility of bodily injury or property damage.
See also J.R. Clancy
's stand on the definition and use of the various terms, over head lifting and the suitability of different chain products for theatrical use.
Also from J.R. Clancy.