get or set the Distribution System for the Electrical Equipment. 
   Namespace:   Autodesk.Revit.DB.Electrical  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Remarks
 This property returns a Distribution System which is assigned to the Electrical Equipment. If there are no Distribution System assigned to this Electrical Equipment, this property will be    a null reference (  Nothing  in Visual Basic)  .