• I'm just giving you my best guess on this question.

    Plugs use alignment keys to keep it in the correct position before tightening down. There is no chain.

    The alignment keys make sure that the wrong plug is not installed on a specific receptacle..

    The keys are different on each plug if a large number of plugs are in one area.
      
      
     
      


    The only chains I've seen are used on the programming plug mentioned above.
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