Gets the upstream electrical analytical node id. 
Namespace: Autodesk.Revit.DB.Electrical
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since:  2024 
Syntax
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Return Value
The upstream node id.Remarks
 If the area based load supplies from Node A, Node A is the upstream node of the area based load, and the area based load is the downstream node of node A.