JBL Professional loudspeakers SR-X Series - Manual (Page 15)

Example
15
Each primary “load bearing” suspension point shall be rated for the entire load.
Primary “Load Bearing”
Facility Attachment Points
(MIN: 5:1 design Factor or Local Standard, Whichever is Greater)
Appropriate Track Fitting
(User supplied, overhead
suspension rated and certified)
Secondary Suspension Point
Appropriate Track Fitting
(EG: AF-DSF)
Working load limits: No more than four (4) high (vertical)
The four (4) high vertical specification represents a static ratio of 7:1