Are I line branch feeders considered to be mechanically restrained in the panel ?

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Issue:
Breakers held into panel

Product Line:
Panelboards

Environment:
I-Line

Resolution:
All I-Line breakers bolt down to the back panel/interior. In addition there is a magnetic attraction of the breaker jaws to the bus bars. The two features serve as bonafide retaining means . Incidentally there used to be I-Line breakers that also bolted onto the bus, but these are no longer offered ( or are really necessary).