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For rated speeds greater than 3.5 m/s (700 ft/min), a tie-down compensation means shall be provided and fastened to the building structure to limit the jump of the car or counterweight as a result of car or counterweight buffer engagement or safety application.
The compensation means, connection, building structural members, and fastenings shall be capable of withstanding the maximum forces to which they are subjected due to car or counterweight buffer engagement or safety application with a factor of safety not less than 2.5.

Related Code Sections

2.21.4.2 Electric Elevators, Tie-Down Compensation Means
For rated speeds greater than 3.5 m/s (700 ft/min), a tie-down compensation means shall be provided and fastened to the building structure to limit ...
Section 2.28 Electric Elevators, Layout Drawings
supports due to buffer engagement at the maximum permissible speed and load (see 8.2.3) (g) where compensation tie-down is applied (see 2.21.4.2 ...