I just did a google search on "chain motor overhead lifting" and it doesn't really confirm that chain motors are fine for overhead lifting - implying movement over people. from CM FAQ: " Can a CM Lodestar be used to hang loads over people's heads? It is preferred that the load always be tied off (dead hung) with auxiliary chains or cable before access to the area beneath the load is permitted. As an alternative, the system may be designed such that malfunction or failure of one hoist's load bearing components does not cause load loss and/or overloading of any other hoist in the system. Note that in such a system, hoist performance and function must be monitored visually or with the use of load cells. However, both the CM Lodestar D8+ and CM Lodestar BGV-C1 feature a 10:1 design factor that allows them to be used for suspending loads above people without a secondary support." A lot of cracks there. PLASA here : http://www.plasa.org/nrag/load_suspension.pdf doesn't make it all so clear and limitless as your statement. In any case, your statement should be more qualified like: "A limited number of really special chain motors are sometimes acceptable for overhead lifting." At least the current literature from CM acknowledges the requirement for alloy chain, something they use to resist. http://blog.cmworks.com/understanding-the-difference-between-chain-grades-and-how-theyre-used/ I am not so concerned the use of these by really qualified people, but the problem is - especially with the unqualified "chain motors are fine for overhead lifting" attitude, is that less than really qualified people will try it. We saw it with indoor pyro. Pyro use to not be permitted indoors then some folks - most of whom who happen to benefit form the sale and use of pyro - got a standard approved and accepted. Well, then even common john and jane doe decided if they read the standard they could do it too. And then we have 100 dead in Rhode Island. Its the attitude that injures and kills. There needs to be a very high bar to jump to be allowed to use chain motors for overhead lifting, with a lot of safeguards and very deep pockets behind the work so when it does go fubar, the victims are compensated. David - I'm not saying you shouldn't do it - but you are making it sound too easy for any high school teacher (or student) that frequents CB as well as many other unqualified individuals to believe they can do it too, and that's not safe.